What is the maximum file upload size with xmlhttprequest level 2?

问题

What is the maximum file upload size with xmlhttprequest level 2 with HTML5?

回答1:

The XMLHttpRequest specification does not mention any limits on the upload size.

In practise, upload requests are limited by:

1. The number of simultaneous uploads: How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers?
2. The configured limit on the web server, eg. LimitRequestBody on Apache, client_max_body_size on Nginx.
3. The limits in the server-side scripting environment, e.g. upload_max_filesize and post_max_size in PHP.
4. Memory limits (bugs, client-side or server-side).

See also:

• Send a file with XmlHttpRequest: Streaming?

来源：https://stackoverflow.com/questions/9004544/what-is-the-maximum-file-upload-size-with-xmlhttprequest-level-2