handle error

Change-Id: Idf5ad6bea38d1f9eba8ea7147f5bc8ad4484fa14

context.go

@@ -195,9 +195,9 @@ func (c *Context) AbortWithStatus(code int) {
 // AbortWithStatusJSON calls `Abort()` and then `JSON` internally.
 // This method stops the chain, writes the status code and return a JSON body.
 // It also sets the Content-Type as "application/json".
-func (c *Context) AbortWithStatusJSON(code int, jsonObj interface{}) {
+func (c *Context) AbortWithStatusJSON(code int, jsonObj interface{}) error {
 	c.Abort()
-	c.JSON(code, jsonObj)
+	return c.JSON(code, jsonObj)
 }
 
 // AbortWithError calls `AbortWithStatus()` and `Error()` internally.
@@ -1062,26 +1062,26 @@ type Negotiate struct {
 }
 
 // Negotiate calls different Render according to acceptable Accept format.
-func (c *Context) Negotiate(code int, config Negotiate) {
+func (c *Context) Negotiate(code int, config Negotiate) error {
 	switch c.NegotiateFormat(config.Offered...) {
 	case binding.MIMEJSON:
 		data := chooseData(config.JSONData, config.Data)
-		c.JSON(code, data)
+		return c.JSON(code, data)
 
 	case binding.MIMEHTML:
 		data := chooseData(config.HTMLData, config.Data)
-		c.HTML(code, config.HTMLName, data)
+		return c.HTML(code, config.HTMLName, data)
 
 	case binding.MIMEXML:
 		data := chooseData(config.XMLData, config.Data)
-		c.XML(code, data)
+		return c.XML(code, data)
 
 	case binding.MIMEYAML:
 		data := chooseData(config.YAMLData, config.Data)
-		c.YAML(code, data)
+		return c.YAML(code, data)
 
 	default:
-		c.AbortWithError(http.StatusNotAcceptable, errors.New("the accepted formats are not offered by the server")) // nolint: errcheck
+		return c.AbortWithError(http.StatusNotAcceptable, errors.New("the accepted formats are not offered by the server")) // nolint: errcheck
 	}
 }