发送带有标头和FormData的XMLHttpRequest

本文介绍了发送带有标头和FormData的XMLHttpRequest的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试发送带有标头的XMLHttpRequest并添加FormData.有没有一种(优雅的)方式我可以做这样的事情:

I am trying to send a XMLHttpRequest with a header and add a FormData. Is there an (elegant) way i can do something like this:

var formData = new FormData(); formData.append("file", file); var xhr = new XMLHttpRequest(); xhr.open("POST", "/ajax_gateway.php?mod=fileupload", true); xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded") xhr.send(formData, "token=add");

推荐答案

发送FormData时不能指定Content-Type头，因为浏览器会自动将该头设置为"multipart/form-data".您也可以设置其他标题，请尝试以下操作:

You cannot specify the Content-Type header when sending FormData because that header automatically gets set to "multipart/form-data" by the browser. You can set other headers though, try this:

var formData = new FormData(); formData.append("file", file); formData.append("mod", "fileupload"); formData.append("token", "add"); var xhr = new XMLHttpRequest(); xhr.open("POST", "/ajax_gateway.php"); xhr.setRequestHeader("X-Answer", "42"); xhr.send(formData);