Javascript 使用 XMLHttprequest 上传文件 - multipart/form-data 中缺少边界
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Uploading a file with XMLHttprequest - Missing boundary in multipart/form-data
提问by Tamás Pap
I'm uploading a file with XMLHttprequest. Here is the JS function, that uploads a file:
我正在使用 XMLHttprequest 上传文件。这是上传文件的 JS 函数：
var upload = function(file) {
// Create form data
var formData = new FormData();
formData.append('file', file);
var xhr = new XMLHttpRequest();
// Open
xhr.open('POST', this.options.action);
// Set headers
xhr.setRequestHeader("Cache-Control", "no-cache");
xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
xhr.setRequestHeader("Content-Type", "multipart/form-data");
xhr.setRequestHeader("X-File-Name", file.fileName);
xhr.setRequestHeader("X-File-Size", file.fileSize);
xhr.setRequestHeader("X-File-Type", file.type);
// Send
xhr.send(formData);
}
On the server side, in upload.phpI read the file this way:
在服务器端，在upload.php 中，我以这种方式读取文件：
file_put_contents($filename, (file_get_contents('php://input')));
Everything works fine, except that I get a PHP Warning:
一切正常，除了我收到一个 PHP 警告：
Missing boundary in multipart/form-data POST data in Unknown on line 0.
Missing boundary in multipart/form-data POST data in Unknown on line 0.
If I remove this line:
xhr.setRequestHeader("Content-Type", "multipart/form-data");the warning goes away.
如果我删除此行：
xhr.setRequestHeader("Content-Type", "multipart/form-data");警告消失。
What should be the problem here?
这里应该是什么问题？
回答by Tamás Pap
Well this is strange a little bit for me, but this is what worked:
嗯，这对我来说有点奇怪，但这是有效的：
// Open
xhr.open('POST', this.options.action, true);
// !!! REMOVED ALL HEADERS
// Send
xhr.send(formData);
In this case, on server side I don't read the file sent via php://inputbut the file will be in the $_FILESarray.
在这种情况下，在服务器端我不读取通过发送的文件，php://input但文件将在$_FILES数组中。
This solved my problem, but I'm still curious why appears now the file in $_FILES?
这解决了我的问题，但我仍然很好奇为什么现在文件出现在$_FILES?
Tested in Chrome, Mozilla, Safari, and IE10.
在 Chrome、Mozilla、Safari 和 IE10 中测试。
