runtime error: index out of range in router Find

[tve]

Test code:

package main

import (
        "github.com/labstack/echo"
)

func main() {
        e := echo.New()
        gr := e.Group("/acct/:a")
        gr.Get("/hello", helloHandler)
        e.Run(":4444")
}

func helloHandler(c *echo.Context) {
        c.String(200, "Hello World!")
}

Failure demo:

$ go run main.go &
[1] 27082
$ curl -i http://localhost:4444/acct/abc
2015/04/28 21:22:57 http: panic serving [::1]:46035: runtime error: index out of range
goroutine 5 [running]:
net/http.func·011()
        /big/usr-local/go/src/net/http/server.go:1130 +0xbb
github.com/labstack/echo.(*router).Find(0xc20800a750, 0xc20801e440, 0x3, 0xc20801e444, 0x9, 0xc2080403c0, 0x0, 0x0)
        /home/src/github.com/labstack/echo/router.go:271 +0x43d
github.com/labstack/echo.(*Echo).ServeHTTP(0xc208066000, 0x7f50a9246010, 0xc2080441e0, 0xc208032410)
        /home/src/github.com/labstack/echo/echo.go:294 +0xd0
net/http.serverHandler.ServeHTTP(0xc208042060, 0x7f50a9246010, 0xc2080441e0, 0xc208032410)
        /big/usr-local/go/src/net/http/server.go:1703 +0x19a
net/http.(*conn).serve(0xc208044000)
        /big/usr-local/go/src/net/http/server.go:1204 +0xb57
created by net/http.(*Server).Serve
        /big/usr-local/go/src/net/http/server.go:1751 +0x35e
curl: (52) Empty reply from server
$ curl -i http://localhost:4444/acct/abc/
2015/04/28 21:23:05 http: panic serving [::1]:46036: runtime error: index out of range
goroutine 6 [running]:
net/http.func·011()
        /big/usr-local/go/src/net/http/server.go:1130 +0xbb
github.com/labstack/echo.(*router).Find(0xc20800a750, 0xc20801e520, 0x3, 0xc20801e524, 0xa, 0xc208040500, 0x0, 0x0)
        /home/src/github.com/labstack/echo/router.go:271 +0x43d
github.com/labstack/echo.(*Echo).ServeHTTP(0xc208066000, 0x7f50a9246010, 0xc208044320, 0xc2080325b0)
        /home/src/github.com/labstack/echo/echo.go:294 +0xd0
net/http.serverHandler.ServeHTTP(0xc208042060, 0x7f50a9246010, 0xc208044320, 0xc2080325b0)
        /big/usr-local/go/src/net/http/server.go:1703 +0x19a
net/http.(*conn).serve(0xc208044280)
        /big/usr-local/go/src/net/http/server.go:1204 +0xb57
created by net/http.(*Server).Serve
        /big/usr-local/go/src/net/http/server.go:1751 +0x35e
curl: (52) Empty reply from server

[tve]

I pulled the latest code (ace1453) and while the first error case is fixed, the second still produces the same panic:

$ curl http://localhost:4444/acct/a/
2015/05/04 19:27:33 http: panic serving [::1]:38340: runtime error: index out of range
goroutine 7 [running]:
net/http.func·011()
        /big/usr-local/go/src/net/http/server.go:1130 +0xbb
github.com/labstack/echo.(*router).Find(0xc20800a750, 0xc20801e4a0, 0x3, 0xc20801e4a4, 0x8, 0xc2080404b0, 0x0, 0x0)
        /home/src/github.com/labstack/echo/router.go:256 +0x407

[vishr]

@tve Adding path parameter in a group will have unpredictable results. Change the group path to /acct/a and it will work.

[vishr]

#49