Added HandleContext to re-enter soft-rewritten Requests. (#709)

gin.go

@@ -273,6 +273,15 @@ func (engine *Engine) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	engine.pool.Put(c)
 }
 
+// Re-enter a context that has been rewritten.
+// This can be done by setting c.Request.Path to your new target.
+// Disclaimer: You can loop yourself to death with this, use wisely.
+func (engine *Engine) HandleContext(c *Context) {
+	c.reset()
+	engine.handleHTTPRequest(c)
+	engine.pool.Put(c)
+}
+
 func (engine *Engine) handleHTTPRequest(context *Context) {
 	httpMethod := context.Request.Method
 	path := context.Request.URL.Path