Don't send http error if response already committed.

Signed-off-by: Vishal Rana <vr@labstack.com>

README.md

@@ -26,6 +26,7 @@ A fast and unfancy micro web framework for Golang.
     - HTML via templates
     - String 
     - JSON
+    - JSONP
     - XML
     - NoContent
     - Redirect

context.go

@@ -115,10 +115,7 @@ func (c *Context) Render(code int, name string, data interface{}) (err error) {
 	}
 	c.response.Header().Set(ContentType, TextHTMLCharsetUTF8)
 	c.response.WriteHeader(code)
-	if err = c.echo.renderer.Render(c.response, name, data); err != nil {
+	return c.echo.renderer.Render(c.response, name, data)
-		c.response.clear()
-	}
-	return
 }
 
 // HTML formats according to a format specifier and sends HTML response with
@@ -126,9 +123,7 @@ func (c *Context) Render(code int, name string, data interface{}) (err error) {
 func (c *Context) HTML(code int, format string, a ...interface{}) (err error) {
 	c.response.Header().Set(ContentType, TextHTMLCharsetUTF8)
 	c.response.WriteHeader(code)
-	if _, err = fmt.Fprintf(c.response, format, a...); err != nil {
+	 _, err = fmt.Fprintf(c.response, format, a...)
-		c.response.clear()
-	}
 	return
 }
 
@@ -137,9 +132,7 @@ func (c *Context) HTML(code int, format string, a ...interface{}) (err error) {
 func (c *Context) String(code int, format string, a ...interface{}) (err error) {
 	c.response.Header().Set(ContentType, TextPlain)
 	c.response.WriteHeader(code)
-	if _, err = fmt.Fprintf(c.response, format, a...); err != nil {
+	_, err = fmt.Fprintf(c.response, format, a...)
-		c.response.clear()
-	}
 	return
 }
 
@@ -147,10 +140,7 @@ func (c *Context) String(code int, format string, a ...interface{}) (err error)
 func (c *Context) JSON(code int, i interface{}) (err error) {
 	c.response.Header().Set(ContentType, ApplicationJSONCharsetUTF8)
 	c.response.WriteHeader(code)
-	if err = json.NewEncoder(c.response).Encode(i); err != nil {
+	return json.NewEncoder(c.response).Encode(i)
-		c.response.clear()
-	}
-	return
 }
 
 // JSONP sends a JSONP response with status code. It uses `callback` to construct
@@ -159,9 +149,7 @@ func (c *Context) JSONP(code int, callback string, i interface{}) (err error) {
 	c.response.Header().Set(ContentType, ApplicationJavaScriptCharsetUTF8)
 	c.response.WriteHeader(code)
 	c.response.Write([]byte(callback + "("))
-	if err = json.NewEncoder(c.response).Encode(i); err != nil {
+	if err = json.NewEncoder(c.response).Encode(i); err == nil {
-		c.response.clear()
-	} else {
 		c.response.Write([]byte(");"))
 	}
 	return
@@ -172,10 +160,7 @@ func (c *Context) XML(code int, i interface{}) (err error) {
 	c.response.Header().Set(ContentType, ApplicationXMLCharsetUTF8)
 	c.response.WriteHeader(code)
 	c.response.Write([]byte(xml.Header))
-	if err = xml.NewEncoder(c.response).Encode(i); err != nil {
+	return xml.NewEncoder(c.response).Encode(i)
-		c.response.clear()
-	}
-	return
 }
 
 // NoContent sends a response with no body and a status code.

echo.go

@@ -195,7 +195,11 @@ func New() (e *Echo) {
 		if e.debug {
 			msg = err.Error()
 		}
-		http.Error(c.response, msg, code)
+		if !c.response.committed {
+			http.Error(c.response, msg, code)
+		}
+		// TODO:
+		// else just send the message? log?
 	}
 	e.SetHTTPErrorHandler(e.defaultHTTPErrorHandler)
 	e.SetBinder(func(r *http.Request, v interface{}) (err error) {

response.go

@@ -81,7 +81,7 @@ func (r *Response) reset(w http.ResponseWriter) {
 	r.committed = false
 }
 
-func (r *Response) clear() {
+//func (r *Response) clear() {
-	r.Header().Del(ContentType)
+//	r.Header().Del(ContentType)
-	r.committed = false
+//	r.committed = false
-}
+//}

website/docs/index.md

@@ -28,6 +28,7 @@ A fast and unfancy micro web framework for Golang.
     - HTML via templates
     - String 
     - JSON
+    - JSONP
     - XML
     - NoContent
     - Redirect