code: public HttpRequest method(Method method) {
  		if (Method.PATCH == method) {
  			this.method = Method.POST;
  			this.header("X-HTTP-Method-Override", "PATCH");
  		} else {
  			this.method = method;
  		}
  		return this;
  	}
docs: 设置请求方法
  
  @param method HTTP方法
  @return HttpRequest