diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3300e78
--- /dev/null
+++ b/README.md
@@ -0,0 +1,65 @@
+# goahttpcheck
+
+A test helper for testing endpoints of APIs generated by Goa v2/v3.
+This makes it possible to test endpoints using ivpusic/httpcheck.
+
+# Usage
+
+1. New checker.
+1. Set the method handler constructor, mounter, and method endpoint in the checker.
+1. Register the middleware with the checker's `Use` method (If any).
+1. Call checker's `Test` method and test by ivpusic/httpcheck way.
+
+# Example
+
+**Design**
+
+```go
+var _ = Service("calc", func() {
+	Description("The calc service performs operations on numbers.")
+	Method("add", func() {
+		Payload(func() {
+			Field(1, "a", Int, "Left operand")
+			Field(2, "b", Int, "Right operand")
+			Required("a", "b")
+		})
+		Result(Int)
+		HTTP(func() {
+			GET("/add/{a}/{b}")
+			Response(StatusOK)
+		})
+	})
+```
+**Tests**
+```go
+import (
+...
+	"calc/gen/calc"
+	"calc/gen/http/calc/server"
+)
+
+func TestCalcsrvc_Add(t *testing.T) {
+	checker := goahttpcheck.New()
+	var logger log.Logger
+	checker.Mount(server.NewAddHandler, server.MountAddHandler, calc.NewAddEndpoint(NewCalc(&logger)))
+
+	// see. https://github.com/ivpusic/httpcheck
+	checker.Test(t, http.MethodGet, "/add/1/2").
+		Check().
+		HasStatus(http.StatusOK).
+		Cb(func(r *http.Response) {
+			b, err := ioutil.ReadAll(r.Body)
+			if err != nil {
+				t.Fatalf("unexpected error, %v", err)
+			}
+			r.Body.Close()
+			if got, expected := strings.TrimSpace(string(b)), "3"; got != expected {
+				t.Errorf("got %+v, expected %v", b, expected)
+			}
+		})
+}
+```
+
+---
+
+MIT
\ No newline at end of file
diff --git a/checker.go b/checker.go
new file mode 100644
index 0000000..7e7a8f3
--- /dev/null
+++ b/checker.go
@@ -0,0 +1,89 @@
+package goahttpcheck
+
+import (
+	"context"
+	"log"
+	"net/http"
+	"testing"
+
+	"github.com/ivpusic/httpcheck"
+	goahttp "goa.design/goa/v3/http"
+	goa "goa.design/goa/v3/pkg"
+)
+
+type (
+	decoder      = func(*http.Request) goahttp.Decoder
+	encoder      = func(context.Context, http.ResponseWriter) goahttp.Encoder
+	errorHandler = func(context.Context, http.ResponseWriter, error)
+	middleware   = func(http.Handler) http.Handler
+
+	HandlerBuilder func(goa.Endpoint, goahttp.Muxer, decoder, encoder, errorHandler) http.Handler
+	HandlerMounter func(goahttp.Muxer, http.Handler)
+)
+
+type APIChecker struct {
+	Mux          goahttp.Muxer
+	Middleware   []middleware
+	Decoder      decoder
+	Encoder      encoder
+	ErrorHandler errorHandler
+}
+
+type Option func(c *APIChecker)
+
+func Muxer(mux goahttp.Muxer) Option {
+	return func(c *APIChecker) {
+		c.Mux = mux
+	}
+}
+
+func Decoder(dec decoder) Option {
+	return func(c *APIChecker) {
+		c.Decoder = dec
+	}
+}
+
+func Encoder(enc encoder) Option {
+	return func(c *APIChecker) {
+		c.Encoder = enc
+	}
+}
+
+func ErrorHandler(eh errorHandler) Option {
+	return func(c *APIChecker) {
+		c.ErrorHandler = eh
+	}
+}
+
+func New(options ...Option) *APIChecker {
+	ret := &APIChecker{
+		Mux:        goahttp.NewMuxer(),
+		Middleware: []middleware{},
+		Decoder:    goahttp.RequestDecoder,
+		Encoder:    goahttp.ResponseEncoder,
+		ErrorHandler: func(ctx context.Context, w http.ResponseWriter, err error) {
+			log.Printf("ERROR: %v", err)
+		},
+	}
+	for _, v := range options {
+		v(ret)
+	}
+	return ret
+}
+
+func (c *APIChecker) Mount(builder HandlerBuilder, mounter HandlerMounter, endpoint goa.Endpoint) {
+	handler := builder(endpoint, c.Mux, c.Decoder, c.Encoder, c.ErrorHandler)
+	mounter(c.Mux, handler)
+}
+func (c *APIChecker) Use(middleware func(http.Handler) http.Handler) {
+	c.Middleware = append(c.Middleware, middleware)
+}
+
+func (c APIChecker) Test(t *testing.T, method, path string) *httpcheck.Checker {
+	var handler http.Handler = c.Mux
+	for _, v := range c.Middleware {
+		handler = v(handler)
+	}
+	checker := httpcheck.New(t, handler)
+	return checker.Test(method, path)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..610644d
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,11 @@
+module github.com/ikawaha/goahttpcheck
+
+go 1.13
+
+require (
+	github.com/ivpusic/go-clicolor v0.0.0-20150828210804-23f0b77f328a // indirect
+	github.com/ivpusic/golog v0.0.0-20170608213328-28640bee649f // indirect
+	github.com/ivpusic/httpcheck v0.0.0-20170215120547-c49b174389ac
+	github.com/shiena/ansicolor v0.0.0-20151119151921-a422bbe96644 // indirect
+	goa.design/goa/v3 v3.0.8
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..e3f0bf7
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,136 @@
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diff --git a/testdata/calc.go b/testdata/calc.go
new file mode 100644
index 0000000..cf2a14c
--- /dev/null
+++ b/testdata/calc.go
@@ -0,0 +1,33 @@
+package calcapi
+
+import (
+	"context"
+	"errors"
+	"log"
+
+	calc "calc/gen/calc"
+)
+
+// calc service example implementation.
+// The example methods log the requests and return zero values.
+type calcsrvc struct {
+	logger *log.Logger
+}
+
+// NewCalc returns the calc service implementation.
+func NewCalc(logger *log.Logger) calc.Service {
+	return &calcsrvc{logger}
+}
+
+// Add implements add.
+func (s *calcsrvc) Add(ctx context.Context, p *calc.AddPayload) (res int, err error) {
+	return p.A + p.B, nil
+}
+
+// Div implements div.
+func (s *calcsrvc) Div(ctx context.Context, p *calc.DivPayload) (res int, err error) {
+	if p.B == 0 {
+		return 0, calc.MakeZeroDivision(errors.New("zero division error"))
+	}
+	return p.A / p.B, nil
+}
diff --git a/testdata/calc_test.go b/testdata/calc_test.go
new file mode 100644
index 0000000..6c6ae57
--- /dev/null
+++ b/testdata/calc_test.go
@@ -0,0 +1,62 @@
+package calcapi
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"strings"
+	"testing"
+
+	"calc/gen/calc"
+	"calc/gen/http/calc/server"
+	"github.com/ikawaha/goahttpcheck"
+	goa "goa.design/goa/v3/pkg"
+)
+
+func TestCalcsrvc_Add(t *testing.T) {
+	checker := goahttpcheck.New()
+	var logger log.Logger
+	checker.Mount(server.NewAddHandler, server.MountAddHandler, calc.NewAddEndpoint(NewCalc(&logger)))
+
+	// see. https://github.com/ivpusic/httpcheck
+	checker.Test(t, http.MethodGet, "/add/1/2").
+		Check().
+		HasStatus(http.StatusOK).
+		Cb(func(r *http.Response) {
+			b, err := ioutil.ReadAll(r.Body)
+			if err != nil {
+				t.Fatalf("unexpected error, %v", err)
+			}
+			r.Body.Close()
+			if got, expected := strings.TrimSpace(string(b)), "3"; got != expected {
+				t.Errorf("got %+v, expected %v", b, expected)
+			}
+		})
+}
+
+func TestCalcsrvc_Div(t *testing.T) {
+	checker := goahttpcheck.New()
+
+	var logger log.Logger
+	checker.Mount(server.NewDivHandler, server.MountDivHandler, calc.NewDivEndpoint(NewCalc(&logger)))
+
+	// see. https://github.com/ivpusic/httpcheck
+	checker.Test(t, "GET", "/div/1/0").
+		Check().
+		HasStatus(http.StatusBadRequest).
+		Cb(func(r *http.Response) {
+			b, err := ioutil.ReadAll(r.Body)
+			if err != nil {
+				t.Fatalf("unexpected error, %v", err)
+			}
+			r.Body.Close()
+			var resp goa.ServiceError
+			if err := json.Unmarshal(b, &resp); err != nil {
+				t.Fatalf("unexpected error, %v", err)
+			}
+			if got, expected := resp.Message, "zero division error"; got != expected {
+				t.Errorf("got %+v, expected %v", got, expected)
+			}
+		})
+}
diff --git a/testdata/cmd/calc-cli/http.go b/testdata/cmd/calc-cli/http.go
new file mode 100644
index 0000000..defbdb6
--- /dev/null
+++ b/testdata/cmd/calc-cli/http.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	cli "calc/gen/http/cli/calc"
+	"net/http"
+	"time"
+
+	goahttp "goa.design/goa/v3/http"
+	goa "goa.design/goa/v3/pkg"
+)
+
+func doHTTP(scheme, host string, timeout int, debug bool) (goa.Endpoint, interface{}, error) {
+	var (
+		doer goahttp.Doer
+	)
+	{
+		doer = &http.Client{Timeout: time.Duration(timeout) * time.Second}
+		if debug {
+			doer = goahttp.NewDebugDoer(doer)
+		}
+	}
+
+	return cli.ParseEndpoint(
+		scheme,
+		host,
+		doer,
+		goahttp.RequestEncoder,
+		goahttp.ResponseDecoder,
+		debug,
+	)
+}
+
+func httpUsageCommands() string {
+	return cli.UsageCommands()
+}
+
+func httpUsageExamples() string {
+	return cli.UsageExamples()
+}
diff --git a/testdata/cmd/calc-cli/main.go b/testdata/cmd/calc-cli/main.go
new file mode 100644
index 0000000..325f726
--- /dev/null
+++ b/testdata/cmd/calc-cli/main.go
@@ -0,0 +1,120 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"net/url"
+	"os"
+	"strings"
+
+	goa "goa.design/goa/v3/pkg"
+)
+
+func main() {
+	var (
+		hostF = flag.String("host", "localhost", "Server host (valid values: localhost)")
+		addrF = flag.String("url", "", "URL to service host")
+
+		verboseF = flag.Bool("verbose", false, "Print request and response details")
+		vF       = flag.Bool("v", false, "Print request and response details")
+		timeoutF = flag.Int("timeout", 30, "Maximum number of seconds to wait for response")
+	)
+	flag.Usage = usage
+	flag.Parse()
+	var (
+		addr    string
+		timeout int
+		debug   bool
+	)
+	{
+		addr = *addrF
+		if addr == "" {
+			switch *hostF {
+			case "localhost":
+				addr = "http://localhost:80"
+			default:
+				fmt.Fprintf(os.Stderr, "invalid host argument: %q (valid hosts: localhost)\n", *hostF)
+				os.Exit(1)
+			}
+		}
+		timeout = *timeoutF
+		debug = *verboseF || *vF
+	}
+
+	var (
+		scheme string
+		host   string
+	)
+	{
+		u, err := url.Parse(addr)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "invalid URL %#v: %s\n", addr, err)
+			os.Exit(1)
+		}
+		scheme = u.Scheme
+		host = u.Host
+	}
+	var (
+		endpoint goa.Endpoint
+		payload  interface{}
+		err      error
+	)
+	{
+		switch scheme {
+		case "http", "https":
+			endpoint, payload, err = doHTTP(scheme, host, timeout, debug)
+		default:
+			fmt.Fprintf(os.Stderr, "invalid scheme: %q (valid schemes: grpc|http)\n", scheme)
+			os.Exit(1)
+		}
+	}
+	if err != nil {
+		if err == flag.ErrHelp {
+			os.Exit(0)
+		}
+		fmt.Fprintln(os.Stderr, err.Error())
+		fmt.Fprintln(os.Stderr, "run '"+os.Args[0]+" --help' for detailed usage.")
+		os.Exit(1)
+	}
+
+	data, err := endpoint(context.Background(), payload)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err.Error())
+		os.Exit(1)
+	}
+
+	if data != nil {
+		m, _ := json.MarshalIndent(data, "", "    ")
+		fmt.Println(string(m))
+	}
+}
+
+func usage() {
+	fmt.Fprintf(os.Stderr, `%s is a command line client for the calc API.
+
+Usage:
+    %s [-host HOST][-url URL][-timeout SECONDS][-verbose|-v] SERVICE ENDPOINT [flags]
+
+    -host HOST:  server host (localhost). valid values: localhost
+    -url URL:    specify service URL overriding host URL (http://localhost:8080)
+    -timeout:    maximum number of seconds to wait for response (30)
+    -verbose|-v: print request and response details (false)
+
+Commands:
+%s
+Additional help:
+    %s SERVICE [ENDPOINT] --help
+
+Example:
+%s
+`, os.Args[0], os.Args[0], indent(httpUsageCommands()), os.Args[0], indent(httpUsageExamples()))
+}
+
+func indent(s string) string {
+	if s == "" {
+		return ""
+	}
+	return "    " + strings.Replace(s, "\n", "\n    ", -1)
+}
diff --git a/testdata/cmd/calc/http.go b/testdata/cmd/calc/http.go
new file mode 100644
index 0000000..757e4f3
--- /dev/null
+++ b/testdata/cmd/calc/http.go
@@ -0,0 +1,109 @@
+package main
+
+import (
+	calc "calc/gen/calc"
+	calcsvr "calc/gen/http/calc/server"
+	"context"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+	"sync"
+	"time"
+
+	goahttp "goa.design/goa/v3/http"
+	httpmdlwr "goa.design/goa/v3/http/middleware"
+	"goa.design/goa/v3/middleware"
+)
+
+// handleHTTPServer starts configures and starts a HTTP server on the given
+// URL. It shuts down the server if any error is received in the error channel.
+func handleHTTPServer(ctx context.Context, u *url.URL, calcEndpoints *calc.Endpoints, wg *sync.WaitGroup, errc chan error, logger *log.Logger, debug bool) {
+
+	// Setup goa log adapter.
+	var (
+		adapter middleware.Logger
+	)
+	{
+		adapter = middleware.NewLogger(logger)
+	}
+
+	// Provide the transport specific request decoder and response encoder.
+	// The goa http package has built-in support for JSON, XML and gob.
+	// Other encodings can be used by providing the corresponding functions,
+	// see goa.design/implement/encoding.
+	var (
+		dec = goahttp.RequestDecoder
+		enc = goahttp.ResponseEncoder
+	)
+
+	// Build the service HTTP request multiplexer and configure it to serve
+	// HTTP requests to the service endpoints.
+	var mux goahttp.Muxer
+	{
+		mux = goahttp.NewMuxer()
+	}
+
+	// Wrap the endpoints with the transport specific layers. The generated
+	// server packages contains code generated from the design which maps
+	// the service input and output data structures to HTTP requests and
+	// responses.
+	var (
+		calcServer *calcsvr.Server
+	)
+	{
+		eh := errorHandler(logger)
+		calcServer = calcsvr.New(calcEndpoints, mux, dec, enc, eh)
+	}
+	// Configure the mux.
+	calcsvr.Mount(mux, calcServer)
+
+	// Wrap the multiplexer with additional middlewares. Middlewares mounted
+	// here apply to all the service endpoints.
+	var handler http.Handler = mux
+	{
+		if debug {
+			handler = httpmdlwr.Debug(mux, os.Stdout)(handler)
+		}
+		handler = httpmdlwr.Log(adapter)(handler)
+		handler = httpmdlwr.RequestID()(handler)
+	}
+
+	// Start HTTP server using default configuration, change the code to
+	// configure the server as required by your service.
+	srv := &http.Server{Addr: u.Host, Handler: handler}
+	for _, m := range calcServer.Mounts {
+		logger.Printf("HTTP %q mounted on %s %s", m.Method, m.Verb, m.Pattern)
+	}
+
+	(*wg).Add(1)
+	go func() {
+		defer (*wg).Done()
+
+		// Start HTTP server in a separate goroutine.
+		go func() {
+			logger.Printf("HTTP server listening on %q", u.Host)
+			errc <- srv.ListenAndServe()
+		}()
+
+		<-ctx.Done()
+		logger.Printf("shutting down HTTP server at %q", u.Host)
+
+		// Shutdown gracefully with a 30s timeout.
+		ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+		defer cancel()
+
+		srv.Shutdown(ctx)
+	}()
+}
+
+// errorHandler returns a function that writes and logs the given error.
+// The function also writes and logs the error unique ID so that it's possible
+// to correlate.
+func errorHandler(logger *log.Logger) func(context.Context, http.ResponseWriter, error) {
+	return func(ctx context.Context, w http.ResponseWriter, err error) {
+		id := ctx.Value(middleware.RequestIDKey).(string)
+		w.Write([]byte("[" + id + "] encoding: " + err.Error()))
+		logger.Printf("[%s] ERROR: %s", id, err.Error())
+	}
+}
diff --git a/testdata/cmd/calc/main.go b/testdata/cmd/calc/main.go
new file mode 100644
index 0000000..7179fe9
--- /dev/null
+++ b/testdata/cmd/calc/main.go
@@ -0,0 +1,106 @@
+package main
+
+import (
+	calcapi "calc"
+	calc "calc/gen/calc"
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"net/url"
+	"os"
+	"os/signal"
+	"strings"
+	"sync"
+)
+
+func main() {
+	// Define command line flags, add any other flag required to configure the
+	// service.
+	var (
+		hostF     = flag.String("host", "localhost", "Server host (valid values: localhost)")
+		domainF   = flag.String("domain", "", "Host domain name (overrides host domain specified in service design)")
+		httpPortF = flag.String("http-port", "", "HTTP port (overrides host HTTP port specified in service design)")
+		secureF   = flag.Bool("secure", false, "Use secure scheme (https or grpcs)")
+		dbgF      = flag.Bool("debug", false, "Log request and response bodies")
+	)
+	flag.Parse()
+
+	// Setup logger. Replace logger with your own log package of choice.
+	var (
+		logger *log.Logger
+	)
+	{
+		logger = log.New(os.Stderr, "[calcapi] ", log.Ltime)
+	}
+
+	// Initialize the services.
+	var (
+		calcSvc calc.Service
+	)
+	{
+		calcSvc = calcapi.NewCalc(logger)
+	}
+
+	// Wrap the services in endpoints that can be invoked from other services
+	// potentially running in different processes.
+	var (
+		calcEndpoints *calc.Endpoints
+	)
+	{
+		calcEndpoints = calc.NewEndpoints(calcSvc)
+	}
+
+	// Create channel used by both the signal handler and server goroutines
+	// to notify the main goroutine when to stop the server.
+	errc := make(chan error)
+
+	// Setup interrupt handler. This optional step configures the process so
+	// that SIGINT and SIGTERM signals cause the services to stop gracefully.
+	go func() {
+		c := make(chan os.Signal, 1)
+		signal.Notify(c, os.Interrupt)
+		errc <- fmt.Errorf("%s", <-c)
+	}()
+
+	var wg sync.WaitGroup
+	ctx, cancel := context.WithCancel(context.Background())
+
+	// Start the servers and send errors (if any) to the error channel.
+	switch *hostF {
+	case "localhost":
+		{
+			addr := "http://localhost:80"
+			u, err := url.Parse(addr)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "invalid URL %#v: %s\n", addr, err)
+				os.Exit(1)
+			}
+			if *secureF {
+				u.Scheme = "https"
+			}
+			if *domainF != "" {
+				u.Host = *domainF
+			}
+			if *httpPortF != "" {
+				h := strings.Split(u.Host, ":")[0]
+				u.Host = h + ":" + *httpPortF
+			} else if u.Port() == "" {
+				u.Host += ":80"
+			}
+			handleHTTPServer(ctx, u, calcEndpoints, &wg, errc, logger, *dbgF)
+		}
+
+	default:
+		fmt.Fprintf(os.Stderr, "invalid host argument: %q (valid hosts: localhost)\n", *hostF)
+	}
+
+	// Wait for signal.
+	logger.Printf("exiting (%v)", <-errc)
+
+	// Send cancellation signal to the goroutines.
+	cancel()
+
+	wg.Wait()
+	logger.Println("exited")
+}
diff --git a/testdata/design/design.go b/testdata/design/design.go
new file mode 100644
index 0000000..e80eb61
--- /dev/null
+++ b/testdata/design/design.go
@@ -0,0 +1,36 @@
+package design
+
+import (
+	. "goa.design/goa/v3/dsl"
+)
+
+var _ = Service("calc", func() {
+	Description("The calc service performs operations on numbers.")
+	Method("add", func() {
+		Payload(func() {
+			Field(1, "a", Int, "Left operand")
+			Field(2, "b", Int, "Right operand")
+			Required("a", "b")
+		})
+		Result(Int)
+		HTTP(func() {
+			GET("/add/{a}/{b}")
+			Response(StatusOK)
+		})
+	})
+
+	Method("div", func() {
+		Error("zero_division", ErrorResult)
+		Payload(func() {
+			Field(1, "a", Int, "Left operand")
+			Field(2, "b", Int, "Right operand")
+			Required("a", "b")
+		})
+		Result(Int)
+		HTTP(func() {
+			GET("/div/{a}/{b}")
+			Response(StatusOK)
+			Response("zero_division", StatusBadRequest)
+		})
+	})
+})
diff --git a/testdata/gen/calc/client.go b/testdata/gen/calc/client.go
new file mode 100644
index 0000000..a3156cb
--- /dev/null
+++ b/testdata/gen/calc/client.go
@@ -0,0 +1,51 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc client
+//
+// Command:
+// $ goa gen calc/design
+
+package calc
+
+import (
+	"context"
+
+	goa "goa.design/goa/v3/pkg"
+)
+
+// Client is the "calc" service client.
+type Client struct {
+	AddEndpoint goa.Endpoint
+	DivEndpoint goa.Endpoint
+}
+
+// NewClient initializes a "calc" service client given the endpoints.
+func NewClient(add, div goa.Endpoint) *Client {
+	return &Client{
+		AddEndpoint: add,
+		DivEndpoint: div,
+	}
+}
+
+// Add calls the "add" endpoint of the "calc" service.
+func (c *Client) Add(ctx context.Context, p *AddPayload) (res int, err error) {
+	var ires interface{}
+	ires, err = c.AddEndpoint(ctx, p)
+	if err != nil {
+		return
+	}
+	return ires.(int), nil
+}
+
+// Div calls the "div" endpoint of the "calc" service.
+// Div may return the following errors:
+//	- "zero_division" (type *goa.ServiceError)
+//	- error: internal error
+func (c *Client) Div(ctx context.Context, p *DivPayload) (res int, err error) {
+	var ires interface{}
+	ires, err = c.DivEndpoint(ctx, p)
+	if err != nil {
+		return
+	}
+	return ires.(int), nil
+}
diff --git a/testdata/gen/calc/endpoints.go b/testdata/gen/calc/endpoints.go
new file mode 100644
index 0000000..c09dd94
--- /dev/null
+++ b/testdata/gen/calc/endpoints.go
@@ -0,0 +1,52 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc endpoints
+//
+// Command:
+// $ goa gen calc/design
+
+package calc
+
+import (
+	"context"
+
+	goa "goa.design/goa/v3/pkg"
+)
+
+// Endpoints wraps the "calc" service endpoints.
+type Endpoints struct {
+	Add goa.Endpoint
+	Div goa.Endpoint
+}
+
+// NewEndpoints wraps the methods of the "calc" service with endpoints.
+func NewEndpoints(s Service) *Endpoints {
+	return &Endpoints{
+		Add: NewAddEndpoint(s),
+		Div: NewDivEndpoint(s),
+	}
+}
+
+// Use applies the given middleware to all the "calc" service endpoints.
+func (e *Endpoints) Use(m func(goa.Endpoint) goa.Endpoint) {
+	e.Add = m(e.Add)
+	e.Div = m(e.Div)
+}
+
+// NewAddEndpoint returns an endpoint function that calls the method "add" of
+// service "calc".
+func NewAddEndpoint(s Service) goa.Endpoint {
+	return func(ctx context.Context, req interface{}) (interface{}, error) {
+		p := req.(*AddPayload)
+		return s.Add(ctx, p)
+	}
+}
+
+// NewDivEndpoint returns an endpoint function that calls the method "div" of
+// service "calc".
+func NewDivEndpoint(s Service) goa.Endpoint {
+	return func(ctx context.Context, req interface{}) (interface{}, error) {
+		p := req.(*DivPayload)
+		return s.Div(ctx, p)
+	}
+}
diff --git a/testdata/gen/calc/service.go b/testdata/gen/calc/service.go
new file mode 100644
index 0000000..8018d47
--- /dev/null
+++ b/testdata/gen/calc/service.go
@@ -0,0 +1,57 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc service
+//
+// Command:
+// $ goa gen calc/design
+
+package calc
+
+import (
+	"context"
+
+	goa "goa.design/goa/v3/pkg"
+)
+
+// The calc service performs operations on numbers.
+type Service interface {
+	// Add implements add.
+	Add(context.Context, *AddPayload) (res int, err error)
+	// Div implements div.
+	Div(context.Context, *DivPayload) (res int, err error)
+}
+
+// ServiceName is the name of the service as defined in the design. This is the
+// same value that is set in the endpoint request contexts under the ServiceKey
+// key.
+const ServiceName = "calc"
+
+// MethodNames lists the service method names as defined in the design. These
+// are the same values that are set in the endpoint request contexts under the
+// MethodKey key.
+var MethodNames = [2]string{"add", "div"}
+
+// AddPayload is the payload type of the calc service add method.
+type AddPayload struct {
+	// Left operand
+	A int
+	// Right operand
+	B int
+}
+
+// DivPayload is the payload type of the calc service div method.
+type DivPayload struct {
+	// Left operand
+	A int
+	// Right operand
+	B int
+}
+
+// MakeZeroDivision builds a goa.ServiceError from an error.
+func MakeZeroDivision(err error) *goa.ServiceError {
+	return &goa.ServiceError{
+		Name:    "zero_division",
+		ID:      goa.NewErrorID(),
+		Message: err.Error(),
+	}
+}
diff --git a/testdata/gen/http/calc/client/cli.go b/testdata/gen/http/calc/client/cli.go
new file mode 100644
index 0000000..3cd647c
--- /dev/null
+++ b/testdata/gen/http/calc/client/cli.go
@@ -0,0 +1,70 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc HTTP client CLI support package
+//
+// Command:
+// $ goa gen calc/design
+
+package client
+
+import (
+	calc "calc/gen/calc"
+	"fmt"
+	"strconv"
+)
+
+// BuildAddPayload builds the payload for the calc add endpoint from CLI flags.
+func BuildAddPayload(calcAddA string, calcAddB string) (*calc.AddPayload, error) {
+	var err error
+	var a int
+	{
+		var v int64
+		v, err = strconv.ParseInt(calcAddA, 10, 64)
+		a = int(v)
+		if err != nil {
+			return nil, fmt.Errorf("invalid value for a, must be INT")
+		}
+	}
+	var b int
+	{
+		var v int64
+		v, err = strconv.ParseInt(calcAddB, 10, 64)
+		b = int(v)
+		if err != nil {
+			return nil, fmt.Errorf("invalid value for b, must be INT")
+		}
+	}
+	payload := &calc.AddPayload{
+		A: a,
+		B: b,
+	}
+	return payload, nil
+}
+
+// BuildDivPayload builds the payload for the calc div endpoint from CLI flags.
+func BuildDivPayload(calcDivA string, calcDivB string) (*calc.DivPayload, error) {
+	var err error
+	var a int
+	{
+		var v int64
+		v, err = strconv.ParseInt(calcDivA, 10, 64)
+		a = int(v)
+		if err != nil {
+			return nil, fmt.Errorf("invalid value for a, must be INT")
+		}
+	}
+	var b int
+	{
+		var v int64
+		v, err = strconv.ParseInt(calcDivB, 10, 64)
+		b = int(v)
+		if err != nil {
+			return nil, fmt.Errorf("invalid value for b, must be INT")
+		}
+	}
+	payload := &calc.DivPayload{
+		A: a,
+		B: b,
+	}
+	return payload, nil
+}
diff --git a/testdata/gen/http/calc/client/client.go b/testdata/gen/http/calc/client/client.go
new file mode 100644
index 0000000..c7a5f3f
--- /dev/null
+++ b/testdata/gen/http/calc/client/client.go
@@ -0,0 +1,94 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc client HTTP transport
+//
+// Command:
+// $ goa gen calc/design
+
+package client
+
+import (
+	"context"
+	"net/http"
+
+	goahttp "goa.design/goa/v3/http"
+	goa "goa.design/goa/v3/pkg"
+)
+
+// Client lists the calc service endpoint HTTP clients.
+type Client struct {
+	// Add Doer is the HTTP client used to make requests to the add endpoint.
+	AddDoer goahttp.Doer
+
+	// Div Doer is the HTTP client used to make requests to the div endpoint.
+	DivDoer goahttp.Doer
+
+	// RestoreResponseBody controls whether the response bodies are reset after
+	// decoding so they can be read again.
+	RestoreResponseBody bool
+
+	scheme  string
+	host    string
+	encoder func(*http.Request) goahttp.Encoder
+	decoder func(*http.Response) goahttp.Decoder
+}
+
+// NewClient instantiates HTTP clients for all the calc service servers.
+func NewClient(
+	scheme string,
+	host string,
+	doer goahttp.Doer,
+	enc func(*http.Request) goahttp.Encoder,
+	dec func(*http.Response) goahttp.Decoder,
+	restoreBody bool,
+) *Client {
+	return &Client{
+		AddDoer:             doer,
+		DivDoer:             doer,
+		RestoreResponseBody: restoreBody,
+		scheme:              scheme,
+		host:                host,
+		decoder:             dec,
+		encoder:             enc,
+	}
+}
+
+// Add returns an endpoint that makes HTTP requests to the calc service add
+// server.
+func (c *Client) Add() goa.Endpoint {
+	var (
+		decodeResponse = DecodeAddResponse(c.decoder, c.RestoreResponseBody)
+	)
+	return func(ctx context.Context, v interface{}) (interface{}, error) {
+		req, err := c.BuildAddRequest(ctx, v)
+		if err != nil {
+			return nil, err
+		}
+		resp, err := c.AddDoer.Do(req)
+
+		if err != nil {
+			return nil, goahttp.ErrRequestError("calc", "add", err)
+		}
+		return decodeResponse(resp)
+	}
+}
+
+// Div returns an endpoint that makes HTTP requests to the calc service div
+// server.
+func (c *Client) Div() goa.Endpoint {
+	var (
+		decodeResponse = DecodeDivResponse(c.decoder, c.RestoreResponseBody)
+	)
+	return func(ctx context.Context, v interface{}) (interface{}, error) {
+		req, err := c.BuildDivRequest(ctx, v)
+		if err != nil {
+			return nil, err
+		}
+		resp, err := c.DivDoer.Do(req)
+
+		if err != nil {
+			return nil, goahttp.ErrRequestError("calc", "div", err)
+		}
+		return decodeResponse(resp)
+	}
+}
diff --git a/testdata/gen/http/calc/client/encode_decode.go b/testdata/gen/http/calc/client/encode_decode.go
new file mode 100644
index 0000000..35a36a1
--- /dev/null
+++ b/testdata/gen/http/calc/client/encode_decode.go
@@ -0,0 +1,160 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc HTTP client encoders and decoders
+//
+// Command:
+// $ goa gen calc/design
+
+package client
+
+import (
+	"bytes"
+	calc "calc/gen/calc"
+	"context"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+
+	goahttp "goa.design/goa/v3/http"
+)
+
+// BuildAddRequest instantiates a HTTP request object with method and path set
+// to call the "calc" service "add" endpoint
+func (c *Client) BuildAddRequest(ctx context.Context, v interface{}) (*http.Request, error) {
+	var (
+		a int
+		b int
+	)
+	{
+		p, ok := v.(*calc.AddPayload)
+		if !ok {
+			return nil, goahttp.ErrInvalidType("calc", "add", "*calc.AddPayload", v)
+		}
+		a = p.A
+		b = p.B
+	}
+	u := &url.URL{Scheme: c.scheme, Host: c.host, Path: AddCalcPath(a, b)}
+	req, err := http.NewRequest("GET", u.String(), nil)
+	if err != nil {
+		return nil, goahttp.ErrInvalidURL("calc", "add", u.String(), err)
+	}
+	if ctx != nil {
+		req = req.WithContext(ctx)
+	}
+
+	return req, nil
+}
+
+// DecodeAddResponse returns a decoder for responses returned by the calc add
+// endpoint. restoreBody controls whether the response body should be restored
+// after having been read.
+func DecodeAddResponse(decoder func(*http.Response) goahttp.Decoder, restoreBody bool) func(*http.Response) (interface{}, error) {
+	return func(resp *http.Response) (interface{}, error) {
+		if restoreBody {
+			b, err := ioutil.ReadAll(resp.Body)
+			if err != nil {
+				return nil, err
+			}
+			resp.Body = ioutil.NopCloser(bytes.NewBuffer(b))
+			defer func() {
+				resp.Body = ioutil.NopCloser(bytes.NewBuffer(b))
+			}()
+		} else {
+			defer resp.Body.Close()
+		}
+		switch resp.StatusCode {
+		case http.StatusOK:
+			var (
+				body int
+				err  error
+			)
+			err = decoder(resp).Decode(&body)
+			if err != nil {
+				return nil, goahttp.ErrDecodingError("calc", "add", err)
+			}
+			return body, nil
+		default:
+			body, _ := ioutil.ReadAll(resp.Body)
+			return nil, goahttp.ErrInvalidResponse("calc", "add", resp.StatusCode, string(body))
+		}
+	}
+}
+
+// BuildDivRequest instantiates a HTTP request object with method and path set
+// to call the "calc" service "div" endpoint
+func (c *Client) BuildDivRequest(ctx context.Context, v interface{}) (*http.Request, error) {
+	var (
+		a int
+		b int
+	)
+	{
+		p, ok := v.(*calc.DivPayload)
+		if !ok {
+			return nil, goahttp.ErrInvalidType("calc", "div", "*calc.DivPayload", v)
+		}
+		a = p.A
+		b = p.B
+	}
+	u := &url.URL{Scheme: c.scheme, Host: c.host, Path: DivCalcPath(a, b)}
+	req, err := http.NewRequest("GET", u.String(), nil)
+	if err != nil {
+		return nil, goahttp.ErrInvalidURL("calc", "div", u.String(), err)
+	}
+	if ctx != nil {
+		req = req.WithContext(ctx)
+	}
+
+	return req, nil
+}
+
+// DecodeDivResponse returns a decoder for responses returned by the calc div
+// endpoint. restoreBody controls whether the response body should be restored
+// after having been read.
+// DecodeDivResponse may return the following errors:
+//	- "zero_division" (type *goa.ServiceError): http.StatusBadRequest
+//	- error: internal error
+func DecodeDivResponse(decoder func(*http.Response) goahttp.Decoder, restoreBody bool) func(*http.Response) (interface{}, error) {
+	return func(resp *http.Response) (interface{}, error) {
+		if restoreBody {
+			b, err := ioutil.ReadAll(resp.Body)
+			if err != nil {
+				return nil, err
+			}
+			resp.Body = ioutil.NopCloser(bytes.NewBuffer(b))
+			defer func() {
+				resp.Body = ioutil.NopCloser(bytes.NewBuffer(b))
+			}()
+		} else {
+			defer resp.Body.Close()
+		}
+		switch resp.StatusCode {
+		case http.StatusOK:
+			var (
+				body int
+				err  error
+			)
+			err = decoder(resp).Decode(&body)
+			if err != nil {
+				return nil, goahttp.ErrDecodingError("calc", "div", err)
+			}
+			return body, nil
+		case http.StatusBadRequest:
+			var (
+				body DivZeroDivisionResponseBody
+				err  error
+			)
+			err = decoder(resp).Decode(&body)
+			if err != nil {
+				return nil, goahttp.ErrDecodingError("calc", "div", err)
+			}
+			err = ValidateDivZeroDivisionResponseBody(&body)
+			if err != nil {
+				return nil, goahttp.ErrValidationError("calc", "div", err)
+			}
+			return nil, NewDivZeroDivision(&body)
+		default:
+			body, _ := ioutil.ReadAll(resp.Body)
+			return nil, goahttp.ErrInvalidResponse("calc", "div", resp.StatusCode, string(body))
+		}
+	}
+}
diff --git a/testdata/gen/http/calc/client/paths.go b/testdata/gen/http/calc/client/paths.go
new file mode 100644
index 0000000..adfc619
--- /dev/null
+++ b/testdata/gen/http/calc/client/paths.go
@@ -0,0 +1,22 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// HTTP request path constructors for the calc service.
+//
+// Command:
+// $ goa gen calc/design
+
+package client
+
+import (
+	"fmt"
+)
+
+// AddCalcPath returns the URL path to the calc service add HTTP endpoint.
+func AddCalcPath(a int, b int) string {
+	return fmt.Sprintf("/add/%v/%v", a, b)
+}
+
+// DivCalcPath returns the URL path to the calc service div HTTP endpoint.
+func DivCalcPath(a int, b int) string {
+	return fmt.Sprintf("/div/%v/%v", a, b)
+}
diff --git a/testdata/gen/http/calc/client/types.go b/testdata/gen/http/calc/client/types.go
new file mode 100644
index 0000000..fb42462
--- /dev/null
+++ b/testdata/gen/http/calc/client/types.go
@@ -0,0 +1,67 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc HTTP client types
+//
+// Command:
+// $ goa gen calc/design
+
+package client
+
+import (
+	goa "goa.design/goa/v3/pkg"
+)
+
+// DivZeroDivisionResponseBody is the type of the "calc" service "div" endpoint
+// HTTP response body for the "zero_division" error.
+type DivZeroDivisionResponseBody struct {
+	// Name is the name of this class of errors.
+	Name *string `form:"name,omitempty" json:"name,omitempty" xml:"name,omitempty"`
+	// ID is a unique identifier for this particular occurrence of the problem.
+	ID *string `form:"id,omitempty" json:"id,omitempty" xml:"id,omitempty"`
+	// Message is a human-readable explanation specific to this occurrence of the
+	// problem.
+	Message *string `form:"message,omitempty" json:"message,omitempty" xml:"message,omitempty"`
+	// Is the error temporary?
+	Temporary *bool `form:"temporary,omitempty" json:"temporary,omitempty" xml:"temporary,omitempty"`
+	// Is the error a timeout?
+	Timeout *bool `form:"timeout,omitempty" json:"timeout,omitempty" xml:"timeout,omitempty"`
+	// Is the error a server-side fault?
+	Fault *bool `form:"fault,omitempty" json:"fault,omitempty" xml:"fault,omitempty"`
+}
+
+// NewDivZeroDivision builds a calc service div endpoint zero_division error.
+func NewDivZeroDivision(body *DivZeroDivisionResponseBody) *goa.ServiceError {
+	v := &goa.ServiceError{
+		Name:      *body.Name,
+		ID:        *body.ID,
+		Message:   *body.Message,
+		Temporary: *body.Temporary,
+		Timeout:   *body.Timeout,
+		Fault:     *body.Fault,
+	}
+	return v
+}
+
+// ValidateDivZeroDivisionResponseBody runs the validations defined on
+// div_zero_division_response_body
+func ValidateDivZeroDivisionResponseBody(body *DivZeroDivisionResponseBody) (err error) {
+	if body.Name == nil {
+		err = goa.MergeErrors(err, goa.MissingFieldError("name", "body"))
+	}
+	if body.ID == nil {
+		err = goa.MergeErrors(err, goa.MissingFieldError("id", "body"))
+	}
+	if body.Message == nil {
+		err = goa.MergeErrors(err, goa.MissingFieldError("message", "body"))
+	}
+	if body.Temporary == nil {
+		err = goa.MergeErrors(err, goa.MissingFieldError("temporary", "body"))
+	}
+	if body.Timeout == nil {
+		err = goa.MergeErrors(err, goa.MissingFieldError("timeout", "body"))
+	}
+	if body.Fault == nil {
+		err = goa.MergeErrors(err, goa.MissingFieldError("fault", "body"))
+	}
+	return
+}
diff --git a/testdata/gen/http/calc/server/encode_decode.go b/testdata/gen/http/calc/server/encode_decode.go
new file mode 100644
index 0000000..1ed785c
--- /dev/null
+++ b/testdata/gen/http/calc/server/encode_decode.go
@@ -0,0 +1,136 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc HTTP server encoders and decoders
+//
+// Command:
+// $ goa gen calc/design
+
+package server
+
+import (
+	"context"
+	"net/http"
+	"strconv"
+
+	goahttp "goa.design/goa/v3/http"
+	goa "goa.design/goa/v3/pkg"
+)
+
+// EncodeAddResponse returns an encoder for responses returned by the calc add
+// endpoint.
+func EncodeAddResponse(encoder func(context.Context, http.ResponseWriter) goahttp.Encoder) func(context.Context, http.ResponseWriter, interface{}) error {
+	return func(ctx context.Context, w http.ResponseWriter, v interface{}) error {
+		res := v.(int)
+		enc := encoder(ctx, w)
+		body := res
+		w.WriteHeader(http.StatusOK)
+		return enc.Encode(body)
+	}
+}
+
+// DecodeAddRequest returns a decoder for requests sent to the calc add
+// endpoint.
+func DecodeAddRequest(mux goahttp.Muxer, decoder func(*http.Request) goahttp.Decoder) func(*http.Request) (interface{}, error) {
+	return func(r *http.Request) (interface{}, error) {
+		var (
+			a   int
+			b   int
+			err error
+
+			params = mux.Vars(r)
+		)
+		{
+			aRaw := params["a"]
+			v, err2 := strconv.ParseInt(aRaw, 10, strconv.IntSize)
+			if err2 != nil {
+				err = goa.MergeErrors(err, goa.InvalidFieldTypeError("a", aRaw, "integer"))
+			}
+			a = int(v)
+		}
+		{
+			bRaw := params["b"]
+			v, err2 := strconv.ParseInt(bRaw, 10, strconv.IntSize)
+			if err2 != nil {
+				err = goa.MergeErrors(err, goa.InvalidFieldTypeError("b", bRaw, "integer"))
+			}
+			b = int(v)
+		}
+		if err != nil {
+			return nil, err
+		}
+		payload := NewAddPayload(a, b)
+
+		return payload, nil
+	}
+}
+
+// EncodeDivResponse returns an encoder for responses returned by the calc div
+// endpoint.
+func EncodeDivResponse(encoder func(context.Context, http.ResponseWriter) goahttp.Encoder) func(context.Context, http.ResponseWriter, interface{}) error {
+	return func(ctx context.Context, w http.ResponseWriter, v interface{}) error {
+		res := v.(int)
+		enc := encoder(ctx, w)
+		body := res
+		w.WriteHeader(http.StatusOK)
+		return enc.Encode(body)
+	}
+}
+
+// DecodeDivRequest returns a decoder for requests sent to the calc div
+// endpoint.
+func DecodeDivRequest(mux goahttp.Muxer, decoder func(*http.Request) goahttp.Decoder) func(*http.Request) (interface{}, error) {
+	return func(r *http.Request) (interface{}, error) {
+		var (
+			a   int
+			b   int
+			err error
+
+			params = mux.Vars(r)
+		)
+		{
+			aRaw := params["a"]
+			v, err2 := strconv.ParseInt(aRaw, 10, strconv.IntSize)
+			if err2 != nil {
+				err = goa.MergeErrors(err, goa.InvalidFieldTypeError("a", aRaw, "integer"))
+			}
+			a = int(v)
+		}
+		{
+			bRaw := params["b"]
+			v, err2 := strconv.ParseInt(bRaw, 10, strconv.IntSize)
+			if err2 != nil {
+				err = goa.MergeErrors(err, goa.InvalidFieldTypeError("b", bRaw, "integer"))
+			}
+			b = int(v)
+		}
+		if err != nil {
+			return nil, err
+		}
+		payload := NewDivPayload(a, b)
+
+		return payload, nil
+	}
+}
+
+// EncodeDivError returns an encoder for errors returned by the div calc
+// endpoint.
+func EncodeDivError(encoder func(context.Context, http.ResponseWriter) goahttp.Encoder) func(context.Context, http.ResponseWriter, error) error {
+	encodeError := goahttp.ErrorEncoder(encoder)
+	return func(ctx context.Context, w http.ResponseWriter, v error) error {
+		en, ok := v.(ErrorNamer)
+		if !ok {
+			return encodeError(ctx, w, v)
+		}
+		switch en.ErrorName() {
+		case "zero_division":
+			res := v.(*goa.ServiceError)
+			enc := encoder(ctx, w)
+			body := NewDivZeroDivisionResponseBody(res)
+			w.Header().Set("goa-error", "zero_division")
+			w.WriteHeader(http.StatusBadRequest)
+			return enc.Encode(body)
+		default:
+			return encodeError(ctx, w, v)
+		}
+	}
+}
diff --git a/testdata/gen/http/calc/server/paths.go b/testdata/gen/http/calc/server/paths.go
new file mode 100644
index 0000000..d7994f5
--- /dev/null
+++ b/testdata/gen/http/calc/server/paths.go
@@ -0,0 +1,22 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// HTTP request path constructors for the calc service.
+//
+// Command:
+// $ goa gen calc/design
+
+package server
+
+import (
+	"fmt"
+)
+
+// AddCalcPath returns the URL path to the calc service add HTTP endpoint.
+func AddCalcPath(a int, b int) string {
+	return fmt.Sprintf("/add/%v/%v", a, b)
+}
+
+// DivCalcPath returns the URL path to the calc service div HTTP endpoint.
+func DivCalcPath(a int, b int) string {
+	return fmt.Sprintf("/div/%v/%v", a, b)
+}
diff --git a/testdata/gen/http/calc/server/server.go b/testdata/gen/http/calc/server/server.go
new file mode 100644
index 0000000..e07657a
--- /dev/null
+++ b/testdata/gen/http/calc/server/server.go
@@ -0,0 +1,178 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc HTTP server
+//
+// Command:
+// $ goa gen calc/design
+
+package server
+
+import (
+	calc "calc/gen/calc"
+	"context"
+	"net/http"
+
+	goahttp "goa.design/goa/v3/http"
+	goa "goa.design/goa/v3/pkg"
+)
+
+// Server lists the calc service endpoint HTTP handlers.
+type Server struct {
+	Mounts []*MountPoint
+	Add    http.Handler
+	Div    http.Handler
+}
+
+// ErrorNamer is an interface implemented by generated error structs that
+// exposes the name of the error as defined in the design.
+type ErrorNamer interface {
+	ErrorName() string
+}
+
+// MountPoint holds information about the mounted endpoints.
+type MountPoint struct {
+	// Method is the name of the service method served by the mounted HTTP handler.
+	Method string
+	// Verb is the HTTP method used to match requests to the mounted handler.
+	Verb string
+	// Pattern is the HTTP request path pattern used to match requests to the
+	// mounted handler.
+	Pattern string
+}
+
+// New instantiates HTTP handlers for all the calc service endpoints.
+func New(
+	e *calc.Endpoints,
+	mux goahttp.Muxer,
+	dec func(*http.Request) goahttp.Decoder,
+	enc func(context.Context, http.ResponseWriter) goahttp.Encoder,
+	eh func(context.Context, http.ResponseWriter, error),
+) *Server {
+	return &Server{
+		Mounts: []*MountPoint{
+			{"Add", "GET", "/add/{a}/{b}"},
+			{"Div", "GET", "/div/{a}/{b}"},
+		},
+		Add: NewAddHandler(e.Add, mux, dec, enc, eh),
+		Div: NewDivHandler(e.Div, mux, dec, enc, eh),
+	}
+}
+
+// Service returns the name of the service served.
+func (s *Server) Service() string { return "calc" }
+
+// Use wraps the server handlers with the given middleware.
+func (s *Server) Use(m func(http.Handler) http.Handler) {
+	s.Add = m(s.Add)
+	s.Div = m(s.Div)
+}
+
+// Mount configures the mux to serve the calc endpoints.
+func Mount(mux goahttp.Muxer, h *Server) {
+	MountAddHandler(mux, h.Add)
+	MountDivHandler(mux, h.Div)
+}
+
+// MountAddHandler configures the mux to serve the "calc" service "add"
+// endpoint.
+func MountAddHandler(mux goahttp.Muxer, h http.Handler) {
+	f, ok := h.(http.HandlerFunc)
+	if !ok {
+		f = func(w http.ResponseWriter, r *http.Request) {
+			h.ServeHTTP(w, r)
+		}
+	}
+	mux.Handle("GET", "/add/{a}/{b}", f)
+}
+
+// NewAddHandler creates a HTTP handler which loads the HTTP request and calls
+// the "calc" service "add" endpoint.
+func NewAddHandler(
+	endpoint goa.Endpoint,
+	mux goahttp.Muxer,
+	dec func(*http.Request) goahttp.Decoder,
+	enc func(context.Context, http.ResponseWriter) goahttp.Encoder,
+	eh func(context.Context, http.ResponseWriter, error),
+) http.Handler {
+	var (
+		decodeRequest  = DecodeAddRequest(mux, dec)
+		encodeResponse = EncodeAddResponse(enc)
+		encodeError    = goahttp.ErrorEncoder(enc)
+	)
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ctx := context.WithValue(r.Context(), goahttp.AcceptTypeKey, r.Header.Get("Accept"))
+		ctx = context.WithValue(ctx, goa.MethodKey, "add")
+		ctx = context.WithValue(ctx, goa.ServiceKey, "calc")
+		payload, err := decodeRequest(r)
+		if err != nil {
+			if err := encodeError(ctx, w, err); err != nil {
+				eh(ctx, w, err)
+			}
+			return
+		}
+
+		res, err := endpoint(ctx, payload)
+
+		if err != nil {
+			if err := encodeError(ctx, w, err); err != nil {
+				eh(ctx, w, err)
+			}
+			return
+		}
+		if err := encodeResponse(ctx, w, res); err != nil {
+			eh(ctx, w, err)
+		}
+	})
+}
+
+// MountDivHandler configures the mux to serve the "calc" service "div"
+// endpoint.
+func MountDivHandler(mux goahttp.Muxer, h http.Handler) {
+	f, ok := h.(http.HandlerFunc)
+	if !ok {
+		f = func(w http.ResponseWriter, r *http.Request) {
+			h.ServeHTTP(w, r)
+		}
+	}
+	mux.Handle("GET", "/div/{a}/{b}", f)
+}
+
+// NewDivHandler creates a HTTP handler which loads the HTTP request and calls
+// the "calc" service "div" endpoint.
+func NewDivHandler(
+	endpoint goa.Endpoint,
+	mux goahttp.Muxer,
+	dec func(*http.Request) goahttp.Decoder,
+	enc func(context.Context, http.ResponseWriter) goahttp.Encoder,
+	eh func(context.Context, http.ResponseWriter, error),
+) http.Handler {
+	var (
+		decodeRequest  = DecodeDivRequest(mux, dec)
+		encodeResponse = EncodeDivResponse(enc)
+		encodeError    = EncodeDivError(enc)
+	)
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ctx := context.WithValue(r.Context(), goahttp.AcceptTypeKey, r.Header.Get("Accept"))
+		ctx = context.WithValue(ctx, goa.MethodKey, "div")
+		ctx = context.WithValue(ctx, goa.ServiceKey, "calc")
+		payload, err := decodeRequest(r)
+		if err != nil {
+			if err := encodeError(ctx, w, err); err != nil {
+				eh(ctx, w, err)
+			}
+			return
+		}
+
+		res, err := endpoint(ctx, payload)
+
+		if err != nil {
+			if err := encodeError(ctx, w, err); err != nil {
+				eh(ctx, w, err)
+			}
+			return
+		}
+		if err := encodeResponse(ctx, w, res); err != nil {
+			eh(ctx, w, err)
+		}
+	})
+}
diff --git a/testdata/gen/http/calc/server/types.go b/testdata/gen/http/calc/server/types.go
new file mode 100644
index 0000000..2791438
--- /dev/null
+++ b/testdata/gen/http/calc/server/types.go
@@ -0,0 +1,62 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc HTTP server types
+//
+// Command:
+// $ goa gen calc/design
+
+package server
+
+import (
+	calc "calc/gen/calc"
+
+	goa "goa.design/goa/v3/pkg"
+)
+
+// DivZeroDivisionResponseBody is the type of the "calc" service "div" endpoint
+// HTTP response body for the "zero_division" error.
+type DivZeroDivisionResponseBody struct {
+	// Name is the name of this class of errors.
+	Name string `form:"name" json:"name" xml:"name"`
+	// ID is a unique identifier for this particular occurrence of the problem.
+	ID string `form:"id" json:"id" xml:"id"`
+	// Message is a human-readable explanation specific to this occurrence of the
+	// problem.
+	Message string `form:"message" json:"message" xml:"message"`
+	// Is the error temporary?
+	Temporary bool `form:"temporary" json:"temporary" xml:"temporary"`
+	// Is the error a timeout?
+	Timeout bool `form:"timeout" json:"timeout" xml:"timeout"`
+	// Is the error a server-side fault?
+	Fault bool `form:"fault" json:"fault" xml:"fault"`
+}
+
+// NewDivZeroDivisionResponseBody builds the HTTP response body from the result
+// of the "div" endpoint of the "calc" service.
+func NewDivZeroDivisionResponseBody(res *goa.ServiceError) *DivZeroDivisionResponseBody {
+	body := &DivZeroDivisionResponseBody{
+		Name:      res.Name,
+		ID:        res.ID,
+		Message:   res.Message,
+		Temporary: res.Temporary,
+		Timeout:   res.Timeout,
+		Fault:     res.Fault,
+	}
+	return body
+}
+
+// NewAddPayload builds a calc service add endpoint payload.
+func NewAddPayload(a int, b int) *calc.AddPayload {
+	return &calc.AddPayload{
+		A: a,
+		B: b,
+	}
+}
+
+// NewDivPayload builds a calc service div endpoint payload.
+func NewDivPayload(a int, b int) *calc.DivPayload {
+	return &calc.DivPayload{
+		A: a,
+		B: b,
+	}
+}
diff --git a/testdata/gen/http/cli/calc/cli.go b/testdata/gen/http/cli/calc/cli.go
new file mode 100644
index 0000000..193892d
--- /dev/null
+++ b/testdata/gen/http/cli/calc/cli.go
@@ -0,0 +1,177 @@
+// Code generated by goa v3.0.8, DO NOT EDIT.
+//
+// calc HTTP client CLI support package
+//
+// Command:
+// $ goa gen calc/design
+
+package cli
+
+import (
+	calcc "calc/gen/http/calc/client"
+	"flag"
+	"fmt"
+	"net/http"
+	"os"
+
+	goahttp "goa.design/goa/v3/http"
+	goa "goa.design/goa/v3/pkg"
+)
+
+// UsageCommands returns the set of commands and sub-commands using the format
+//
+//    command (subcommand1|subcommand2|...)
+//
+func UsageCommands() string {
+	return `calc (add|div)
+`
+}
+
+// UsageExamples produces an example of a valid invocation of the CLI tool.
+func UsageExamples() string {
+	return os.Args[0] + ` calc add --a 3793862871819669726 --b 8399553735696626949` + "\n" +
+		""
+}
+
+// ParseEndpoint returns the endpoint and payload as specified on the command
+// line.
+func ParseEndpoint(
+	scheme, host string,
+	doer goahttp.Doer,
+	enc func(*http.Request) goahttp.Encoder,
+	dec func(*http.Response) goahttp.Decoder,
+	restore bool,
+) (goa.Endpoint, interface{}, error) {
+	var (
+		calcFlags = flag.NewFlagSet("calc", flag.ContinueOnError)
+
+		calcAddFlags = flag.NewFlagSet("add", flag.ExitOnError)
+		calcAddAFlag = calcAddFlags.String("a", "REQUIRED", "Left operand")
+		calcAddBFlag = calcAddFlags.String("b", "REQUIRED", "Right operand")
+
+		calcDivFlags = flag.NewFlagSet("div", flag.ExitOnError)
+		calcDivAFlag = calcDivFlags.String("a", "REQUIRED", "Left operand")
+		calcDivBFlag = calcDivFlags.String("b", "REQUIRED", "Right operand")
+	)
+	calcFlags.Usage = calcUsage
+	calcAddFlags.Usage = calcAddUsage
+	calcDivFlags.Usage = calcDivUsage
+
+	if err := flag.CommandLine.Parse(os.Args[1:]); err != nil {
+		return nil, nil, err
+	}
+
+	if flag.NArg() < 2 { // two non flag args are required: SERVICE and ENDPOINT (aka COMMAND)
+		return nil, nil, fmt.Errorf("not enough arguments")
+	}
+
+	var (
+		svcn string
+		svcf *flag.FlagSet
+	)
+	{
+		svcn = flag.Arg(0)
+		switch svcn {
+		case "calc":
+			svcf = calcFlags
+		default:
+			return nil, nil, fmt.Errorf("unknown service %q", svcn)
+		}
+	}
+	if err := svcf.Parse(flag.Args()[1:]); err != nil {
+		return nil, nil, err
+	}
+
+	var (
+		epn string
+		epf *flag.FlagSet
+	)
+	{
+		epn = svcf.Arg(0)
+		switch svcn {
+		case "calc":
+			switch epn {
+			case "add":
+				epf = calcAddFlags
+
+			case "div":
+				epf = calcDivFlags
+
+			}
+
+		}
+	}
+	if epf == nil {
+		return nil, nil, fmt.Errorf("unknown %q endpoint %q", svcn, epn)
+	}
+
+	// Parse endpoint flags if any
+	if svcf.NArg() > 1 {
+		if err := epf.Parse(svcf.Args()[1:]); err != nil {
+			return nil, nil, err
+		}
+	}
+
+	var (
+		data     interface{}
+		endpoint goa.Endpoint
+		err      error
+	)
+	{
+		switch svcn {
+		case "calc":
+			c := calcc.NewClient(scheme, host, doer, enc, dec, restore)
+			switch epn {
+			case "add":
+				endpoint = c.Add()
+				data, err = calcc.BuildAddPayload(*calcAddAFlag, *calcAddBFlag)
+			case "div":
+				endpoint = c.Div()
+				data, err = calcc.BuildDivPayload(*calcDivAFlag, *calcDivBFlag)
+			}
+		}
+	}
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return endpoint, data, nil
+}
+
+// calcUsage displays the usage of the calc command and its subcommands.
+func calcUsage() {
+	fmt.Fprintf(os.Stderr, `The calc service performs operations on numbers.
+Usage:
+    %s [globalflags] calc COMMAND [flags]
+
+COMMAND:
+    add: Add implements add.
+    div: Div implements div.
+
+Additional help:
+    %s calc COMMAND --help
+`, os.Args[0], os.Args[0])
+}
+func calcAddUsage() {
+	fmt.Fprintf(os.Stderr, `%s [flags] calc add -a INT -b INT
+
+Add implements add.
+    -a INT: Left operand
+    -b INT: Right operand
+
+Example:
+    `+os.Args[0]+` calc add --a 3793862871819669726 --b 8399553735696626949
+`, os.Args[0])
+}
+
+func calcDivUsage() {
+	fmt.Fprintf(os.Stderr, `%s [flags] calc div -a INT -b INT
+
+Div implements div.
+    -a INT: Left operand
+    -b INT: Right operand
+
+Example:
+    `+os.Args[0]+` calc div --a 5401762099778430809 --b 1918630006328122782
+`, os.Args[0])
+}
diff --git a/testdata/gen/http/openapi.json b/testdata/gen/http/openapi.json
new file mode 100644
index 0000000..4ed745d
--- /dev/null
+++ b/testdata/gen/http/openapi.json
@@ -0,0 +1 @@
+{"swagger":"2.0","info":{"title":"","version":""},"host":"localhost:80","consumes":["application/json","application/xml","application/gob"],"produces":["application/json","application/xml","application/gob"],"paths":{"/add/{a}/{b}":{"get":{"tags":["calc"],"summary":"add calc","operationId":"calc#add","parameters":[{"name":"a","in":"path","description":"Left operand","required":true,"type":"integer"},{"name":"b","in":"path","description":"Right operand","required":true,"type":"integer"}],"responses":{"200":{"description":"OK response.","schema":{"type":"integer","format":"int64"}}},"schemes":["http"]}},"/div/{a}/{b}":{"get":{"tags":["calc"],"summary":"div calc","operationId":"calc#div","parameters":[{"name":"a","in":"path","description":"Left operand","required":true,"type":"integer"},{"name":"b","in":"path","description":"Right operand","required":true,"type":"integer"}],"responses":{"200":{"description":"OK response.","schema":{"type":"integer","format":"int64"}},"400":{"description":"Bad Request response.","schema":{"$ref":"#/definitions/CalcDivZeroDivisionResponseBody"}}},"schemes":["http"]}}},"definitions":{"CalcDivZeroDivisionResponseBody":{"title":"Mediatype identifier: application/vnd.goa.error; view=default","type":"object","properties":{"fault":{"type":"boolean","description":"Is the error a server-side fault?","example":true},"id":{"type":"string","description":"ID is a unique identifier for this particular occurrence of the problem.","example":"123abc"},"message":{"type":"string","description":"Message is a human-readable explanation specific to this occurrence of the problem.","example":"parameter 'p' must be an integer"},"name":{"type":"string","description":"Name is the name of this class of errors.","example":"bad_request"},"temporary":{"type":"boolean","description":"Is the error temporary?","example":false},"timeout":{"type":"boolean","description":"Is the error a timeout?","example":false}},"description":"div_zero_division_response_body result type (default view)","example":{"fault":true,"id":"123abc","message":"parameter 'p' must be an integer","name":"bad_request","temporary":true,"timeout":true},"required":["name","id","message","temporary","timeout","fault"]}}}
\ No newline at end of file
diff --git a/testdata/gen/http/openapi.yaml b/testdata/gen/http/openapi.yaml
new file mode 100644
index 0000000..4c81bb2
--- /dev/null
+++ b/testdata/gen/http/openapi.yaml
@@ -0,0 +1,114 @@
+swagger: "2.0"
+info:
+  title: ""
+  version: ""
+host: localhost:80
+consumes:
+- application/json
+- application/xml
+- application/gob
+produces:
+- application/json
+- application/xml
+- application/gob
+paths:
+  /add/{a}/{b}:
+    get:
+      tags:
+      - calc
+      summary: add calc
+      operationId: calc#add
+      parameters:
+      - name: a
+        in: path
+        description: Left operand
+        required: true
+        type: integer
+      - name: b
+        in: path
+        description: Right operand
+        required: true
+        type: integer
+      responses:
+        "200":
+          description: OK response.
+          schema:
+            type: integer
+            format: int64
+      schemes:
+      - http
+  /div/{a}/{b}:
+    get:
+      tags:
+      - calc
+      summary: div calc
+      operationId: calc#div
+      parameters:
+      - name: a
+        in: path
+        description: Left operand
+        required: true
+        type: integer
+      - name: b
+        in: path
+        description: Right operand
+        required: true
+        type: integer
+      responses:
+        "200":
+          description: OK response.
+          schema:
+            type: integer
+            format: int64
+        "400":
+          description: Bad Request response.
+          schema:
+            $ref: '#/definitions/CalcDivZeroDivisionResponseBody'
+      schemes:
+      - http
+definitions:
+  CalcDivZeroDivisionResponseBody:
+    title: 'Mediatype identifier: application/vnd.goa.error; view=default'
+    type: object
+    properties:
+      fault:
+        type: boolean
+        description: Is the error a server-side fault?
+        example: true
+      id:
+        type: string
+        description: ID is a unique identifier for this particular occurrence of the
+          problem.
+        example: 123abc
+      message:
+        type: string
+        description: Message is a human-readable explanation specific to this occurrence
+          of the problem.
+        example: parameter 'p' must be an integer
+      name:
+        type: string
+        description: Name is the name of this class of errors.
+        example: bad_request
+      temporary:
+        type: boolean
+        description: Is the error temporary?
+        example: false
+      timeout:
+        type: boolean
+        description: Is the error a timeout?
+        example: false
+    description: div_zero_division_response_body result type (default view)
+    example:
+      fault: true
+      id: 123abc
+      message: parameter 'p' must be an integer
+      name: bad_request
+      temporary: true
+      timeout: true
+    required:
+    - name
+    - id
+    - message
+    - temporary
+    - timeout
+    - fault
diff --git a/testdata/go.mod b/testdata/go.mod
new file mode 100644
index 0000000..14ebc57
--- /dev/null
+++ b/testdata/go.mod
@@ -0,0 +1,10 @@
+module calc
+
+go 1.13
+
+replace github.com/ikawaha/goahttpcheck => ../
+
+require (
+	github.com/ikawaha/goahttpcheck v0.0.0-00010101000000-000000000000
+	goa.design/goa/v3 v3.0.8
+)
diff --git a/testdata/go.sum b/testdata/go.sum
new file mode 100644
index 0000000..3fde591
--- /dev/null
+++ b/testdata/go.sum
@@ -0,0 +1,139 @@
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