add GetHeader() to easily get header in Request

context.go

@@ -390,6 +390,12 @@ func (c *Context) Header(key, value string) {
 	}
 }
 
+// GetHeader is a shortcut for c.Request.Header.Get(key)
+// It get the header in th request.
+func (c *Context) GetHeader(key string) {
+        return c.Request.Header.Get(key)
+}
+
 func (c *Context) SetCookie(
 	name string,
 	value string,