diff --git a/src/Httpful/Request.php b/src/Httpful/Request.php
index bf40b44..96e6f18 100644
--- a/src/Httpful/Request.php
+++ b/src/Httpful/Request.php
@@ -27,6 +27,7 @@ class Request
     public $uri,
            $method                  = Http::GET,
            $headers                 = array(),
+           $raw_headers             = '',
            $strict_ssl              = false,
            $content_type,
            $expected_type,
@@ -685,15 +686,49 @@ public function _curlPrep()
 
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 
-        $headers = array("Content-Type: {$this->content_type}");
-
-        $headers[] = !empty($this->expected_type) ?
-            "Accept: {$this->expected_type}, text/plain" :
-            "Accept: */*";
+        $headers = array();
+        if (!isset($this->headers['User-Agent'])) {
+            $user_agent = 'User-Agent: HttpFul/1.0 (cURL/';
+	        $curl = \curl_version();
+            if (isset($curl['version']))
+                $user_agent .= $curl['version'];
+            else
+                $user_agent .= '?.?.?';
+            $user_agent .= ' PHP/'.PHP_VERSION.' ('.PHP_OS.')';
+		    if (isset($_SERVER['SERVER_SOFTWARE']))
+		        $user_agent .= ' '.\preg_replace('~PHP/[\d\.]+~U', '', $_SERVER['SERVER_SOFTWARE']);
+            else {
+                if (isset($_SERVER['TERM_PROGRAM']))
+                    $user_agent .= " {$_SERVER['TERM_PROGRAM']}";
+                if (isset($_SERVER['TERM_PROGRAM_VERSION']))
+                    $user_agent .= "/{$_SERVER['TERM_PROGRAM_VERSION']}";
+            }
+            if (isset($_SERVER['HTTP_USER_AGENT']))
+                $user_agent .= " {$_SERVER['HTTP_USER_AGENT']}";
+            $user_agent .= ')';
+            $headers[] = $user_agent;
+		}
+        $headers[] = "Content-Type: {$this->content_type}";
+
+        // http://pretty-rfc.herokuapp.com/RFC2616#header.accept
+        $accept = "Accept: */*; q=0.5, text/plain; q=0.8,\r\n\t" .
+                       'text/html;level=3; q=0.9';
+        if (!empty($this->expected_type))
+            $accept .= ", {$this->expected_type}";
+        $headers[] = $accept;
 
         foreach ($this->headers as $header => $value) {
             $headers[] = "$header: $value";
         }
+
+        $url = \parse_url($this->uri);
+        $path = (isset($url['path']) ? $url['path'] : '/').(isset($url['query']) ? '?'.$url['query'] : '');
+        $this->raw_headers = "{$this->method} $path HTTP/1.1\r\n";
+        $host = (isset($url['host']) ? $url['host'] : 'localhost').(isset($url['port']) ? ':'.$url['port'] : '');
+        $this->raw_headers .= "Host: $host\r\n";
+        $this->raw_headers .= \implode("\r\n", $headers);
+        $this->raw_headers .= "\r\n";
+
         curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
 
         if (isset($this->payload)) {
diff --git a/src/Httpful/Response.php b/src/Httpful/Response.php
index 5778e76..1075405 100644
--- a/src/Httpful/Response.php
+++ b/src/Httpful/Response.php
@@ -13,6 +13,7 @@ class Response
     public $body,
            $raw_body,
            $headers,
+           $raw_headers,
            $request,
            $code = 0,
            $content_type,
@@ -42,11 +43,21 @@ public function __construct($body, $headers, Request $request)
     }
 
     /**
-     * @return bool Did we receive a 400 or 500?
+     * Status Code Definitions
+     *
+     * Informational 1xx
+     * Successful    2xx
+     * Redirection   3xx
+     * Client Error  4xx
+     * Server Error  5xx
+     *
+     * http://pretty-rfc.herokuapp.com/RFC2616#status.codes
+     *
+     * @return bool Did we receive a 4xx or 5xx?
      */
     public function hasErrors()
     {
-        return $this->code < 100 || $this->code >= 400;
+        return $this->code >= 400;
     }
 
     /**
@@ -100,7 +111,8 @@ public function _parse($body)
      */
     public function _parseHeaders($headers)
     {
-        $headers = preg_split("/(\r|\n)+/", $headers);
+        $headers = preg_split("/(\r|\n)+/", $headers, -1, \PREG_SPLIT_NO_EMPTY);
+        $parse_headers = array();
         for ($i = 1; $i < count($headers); $i++) {
             list($key, $raw_value) = explode(':', $headers[$i], 2);
             $parse_headers[trim($key)] = trim($raw_value);
diff --git a/tests/Httpful/HttpfulTest.php b/tests/Httpful/HttpfulTest.php
index 03d7ecb..524edca 100644
--- a/tests/Httpful/HttpfulTest.php
+++ b/tests/Httpful/HttpfulTest.php
@@ -28,13 +28,13 @@ class HttpfulTest extends \PHPUnit_Framework_TestCase
 "HTTP/1.1 200 OK
 Content-Type: application/json
 Connection: keep-alive
-Transfer-Encoding: chunked";
+Transfer-Encoding: chunked\r\n";
     const SAMPLE_JSON_RESPONSE = '{"key":"value","object":{"key":"value"},"array":[1,2,3,4]}';
     const SAMPLE_CSV_HEADER =
 "HTTP/1.1 200 OK
 Content-Type: text/csv
 Connection: keep-alive
-Transfer-Encoding: chunked";
+Transfer-Encoding: chunked\r\n";
     const SAMPLE_CSV_RESPONSE = 
 "Key1,Key2
 Value1,Value2
@@ -44,12 +44,12 @@ class HttpfulTest extends \PHPUnit_Framework_TestCase
 "HTTP/1.1 200 OK
 Content-Type: application/xml
 Connection: keep-alive
-Transfer-Encoding: chunked";
+Transfer-Encoding: chunked\r\n";
     const SAMPLE_VENDOR_HEADER =
 "HTTP/1.1 200 OK
 Content-Type: application/vnd.nategood.message+xml
 Connection: keep-alive
-Transfer-Encoding: chunked";
+Transfer-Encoding: chunked\r\n";
     const SAMPLE_VENDOR_TYPE = "application/vnd.nategood.message+xml";
 
     function testInit()
@@ -169,7 +169,35 @@ function testIni()
         Request::resetIni();
     }
 
-    function testAuthSetup()
+    function testAccept()
+    {
+        $r = Request::get('http://example.com/')
+            ->expectsType(Mime::JSON);
+
+        $this->assertEquals(Mime::JSON, $r->expected_type);
+        $r->_curlPrep();
+        $this->assertContains('application/json', $r->raw_headers);
+    }
+    function testUserAgent()
+    {
+        $r = Request::get('http://example.com/')
+            ->withUserAgent('ACME/1.2.3');
+
+        $this->assertArrayHasKey('User-Agent', $r->headers);
+        $r->_curlPrep();
+        $this->assertContains('User-Agent: ACME/1.2.3', $r->raw_headers);
+        $this->assertNotContains('User-Agent: HttpFul/1.0', $r->raw_headers);
+
+        $r = Request::get('http://example.com/')
+            ->withUserAgent('');
+
+        $this->assertArrayHasKey('User-Agent', $r->headers);
+        $r->_curlPrep();
+        $this->assertContains('User-Agent:', $r->raw_headers);
+        $this->assertNotContains('User-Agent: HttpFul/1.0', $r->raw_headers);
+    }
+
+	function testAuthSetup()
     {
         $username = 'nathan';
         $password = 'opensesame';
@@ -228,7 +256,7 @@ function testParsingContentTypeCharset()
         // $response = new Response(SAMPLE_JSON_RESPONSE, "", $req);
         // // Check default content type of iso-8859-1
         $response = new Response(self::SAMPLE_JSON_RESPONSE, "HTTP/1.1 200 OK
-Content-Type: text/plain; charset=utf-8", $req);
+Content-Type: text/plain; charset=utf-8\r\n", $req);
         $this->assertInternalType('array', $response->headers);
         $this->assertEquals($response->headers['Content-Type'], 'text/plain; charset=utf-8');
         $this->assertEquals($response->content_type, 'text/plain');
@@ -263,6 +291,53 @@ function testParseHeaders()
         $this->assertEquals('application/json', $response->headers['Content-Type']);
     }
 
+    function testRawHeaders()
+    {
+        $req = Request::init()->sendsAndExpects(Mime::JSON);
+        $response = new Response(self::SAMPLE_JSON_RESPONSE, self::SAMPLE_JSON_HEADER, $req);
+        $this->assertContains('Content-Type: application/json', $response->raw_headers);
+    }
+
+    function testHasErrors()
+    {
+        $req = Request::init()->sendsAndExpects(Mime::JSON);
+        $response = new Response('', "HTTP/1.1 100 Continue\r\n", $req);
+        $this->assertFalse($response->hasErrors());
+        $response = new Response('', "HTTP/1.1 200 OK\r\n", $req);
+        $this->assertFalse($response->hasErrors());
+        $response = new Response('', "HTTP/1.1 300 Multiple Choices\r\n", $req);
+        $this->assertFalse($response->hasErrors());
+        $response = new Response('', "HTTP/1.1 400 Bad Request\r\n", $req);
+        $this->assertTrue($response->hasErrors());
+        $response = new Response('', "HTTP/1.1 500 Internal Server Error\r\n", $req);
+        $this->assertTrue($response->hasErrors());
+    }
+
+    function test_parseCode()
+    {
+        $req = Request::init()->sendsAndExpects(Mime::JSON);
+        $response = new Response(self::SAMPLE_JSON_RESPONSE, self::SAMPLE_JSON_HEADER, $req);
+        $code = $response->_parseCode("HTTP/1.1 406 Not Acceptable\r\n");
+        $this->assertEquals(406, $code);
+    }
+
+    function testToString()
+    {
+        $req = Request::init()->sendsAndExpects(Mime::JSON);
+        $response = new Response(self::SAMPLE_JSON_RESPONSE, self::SAMPLE_JSON_HEADER, $req);
+        $this->assertEquals(self::SAMPLE_JSON_RESPONSE, (string)$response);
+    }
+
+    function test_parseHeaders()
+    {
+        $req = Request::init();
+        $response = new Response(self::SAMPLE_JSON_RESPONSE, self::SAMPLE_JSON_HEADER, $req);
+        $parse_headers = $response->_parseHeaders(self::SAMPLE_JSON_HEADER);
+        $this->assertEquals(3, count($parse_headers));
+        $this->assertEquals('application/json', $parse_headers['Content-Type']);
+        $this->assertArrayHasKey('Connection', $parse_headers);
+    }
+
     function testDetectContentType()
     {
         $req = Request::init();
@@ -298,7 +373,7 @@ function testMissingContentType()
         $response = new Response('<xml><name>Nathan</name></xml>',
 "HTTP/1.1 200 OK
 Connection: keep-alive
-Transfer-Encoding: chunked", $request);
+Transfer-Encoding: chunked\r\n", $request);
 
         $this->assertEquals("", $response->content_type);
     }
@@ -342,4 +417,5 @@ class DemoMimeHandler extends \Httpful\Handlers\MimeHandlerAdapter {
     public function parse($body) {
         return 'custom parse';
     }
-}
\ No newline at end of file
+}
+
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index 1df78ad..8f62e80 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -1,7 +1,9 @@
 <phpunit>
-    <testsuites>
-        <testsuite name="Httpful">
-            <directory>Httpful</directory>
-        </testsuite>
-    </testsuites>
-</phpunit>
\ No newline at end of file
+    <testsuite name="Httpful">
+        <directory>.</directory>
+    </testsuite>
+    <logging>
+        <log type="coverage-text" target="php://stdout" showUncoveredFiles="false"/>
+    </logging>
+</phpunit>
+