Update vendor

vendor/github.com/labstack/echo/context.go

@@ -31,6 +31,9 @@ type (
 		// IsTLS returns true if HTTP connection is TLS otherwise false.
 		IsTLS() bool
 
+		// IsWebSocket returns true if HTTP connection is WebSocket otherwise false.
+		IsWebSocket() bool
+
 		// Scheme returns the HTTP protocol scheme, `http` or `https`.
 		Scheme() string
 
@@ -219,19 +222,36 @@ func (c *context) IsTLS() bool {
 	return c.request.TLS != nil
 }
 
+func (c *context) IsWebSocket() bool {
+	upgrade := c.request.Header.Get(HeaderUpgrade)
+	return upgrade == "websocket" || upgrade == "Websocket"
+}
+
 func (c *context) Scheme() string {
 	// Can't use `r.Request.URL.Scheme`
 	// See: https://groups.google.com/forum/#!topic/golang-nuts/pMUkBlQBDF0
 	if c.IsTLS() {
 		return "https"
 	}
+	if scheme := c.request.Header.Get(HeaderXForwardedProto); scheme != "" {
+		return scheme
+	}
+	if scheme := c.request.Header.Get(HeaderXForwardedProtocol); scheme != "" {
+		return scheme
+	}
+	if ssl := c.request.Header.Get(HeaderXForwardedSsl); ssl == "on" {
+		return "https"
+	}
+	if scheme := c.request.Header.Get(HeaderXUrlScheme); scheme != "" {
+		return scheme
+	}
 	return "http"
 }
 
 func (c *context) RealIP() string {
 	ra := c.request.RemoteAddr
 	if ip := c.request.Header.Get(HeaderXForwardedFor); ip != "" {
-		ra = ip
+		ra = strings.Split(ip, ", ")[0]
 	} else if ip := c.request.Header.Get(HeaderXRealIP); ip != "" {
 		ra = ip
 	} else {
@@ -275,7 +295,7 @@ func (c *context) SetParamNames(names ...string) {
 }
 
 func (c *context) ParamValues() []string {
-	return c.pvalues
+	return c.pvalues[:len(c.pnames)]
 }
 
 func (c *context) SetParamValues(values ...string) {
@@ -385,7 +405,8 @@ func (c *context) String(code int, s string) (err error) {
 }
 
 func (c *context) JSON(code int, i interface{}) (err error) {
-	if c.echo.Debug {
+	_, pretty := c.QueryParams()["pretty"]
+	if c.echo.Debug || pretty {
 		return c.JSONPretty(code, i, "  ")
 	}
 	b, err := json.Marshal(i)
@@ -429,7 +450,8 @@ func (c *context) JSONPBlob(code int, callback string, b []byte) (err error) {
 }
 
 func (c *context) XML(code int, i interface{}) (err error) {
-	if c.echo.Debug {
+	_, pretty := c.QueryParams()["pretty"]
+	if c.echo.Debug || pretty {
 		return c.XMLPretty(code, i, "  ")
 	}
 	b, err := xml.Marshal(i)
@@ -471,7 +493,12 @@ func (c *context) Stream(code int, contentType string, r io.Reader) (err error)
 	return
 }
 
-func (c *context) File(file string) error {
+func (c *context) File(file string) (err error) {
+	file, err = url.QueryUnescape(file) // Issue #839
+	if err != nil {
+		return
+	}
+
 	f, err := os.Open(file)
 	if err != nil {
 		return ErrNotFound
@@ -487,11 +514,11 @@ func (c *context) File(file string) error {
 		}
 		defer f.Close()
 		if fi, err = f.Stat(); err != nil {
-			return err
+			return
 		}
 	}
 	http.ServeContent(c.Response(), c.Request(), fi.Name(), fi.ModTime(), f)
-	return nil
+	return
 }
 
 func (c *context) Attachment(file, name string) (err error) {
@@ -514,7 +541,7 @@ func (c *context) NoContent(code int) error {
 }
 
 func (c *context) Redirect(code int, url string) error {
-	if code < http.StatusMultipleChoices || code > http.StatusTemporaryRedirect {
+	if code < 300 || code > 308 {
 		return ErrInvalidRedirectCode
 	}
 	c.response.Header().Set(HeaderLocation, url)
@@ -548,4 +575,8 @@ func (c *context) Reset(r *http.Request, w http.ResponseWriter) {
 	c.query = nil
 	c.handler = NotFoundHandler
 	c.store = nil
+	c.path = ""
+	c.pnames = nil
+	// NOTE: Don't reset because it has to have length c.echo.maxParam at all times
+	// c.pvalues = nil
 }