Limit on FileReference uploads?!

Question

Hello,

I am currently uploading files in ActionScript 3 using the upload() method of the FileReference class.

I built an uploader than can do simultaneous or parallel uploads, having a variable set the number of maximum uploads at a time.

I noticed that for Internet Explorer I could be uploading 10 or more files simultaneously, but FireFox and Safari seems to cap the number of uploads to 2. That is, when I call the upload method on per say, 3 files, only 2 will get events back (such as ProgressEvent.PROGRESS). Only when one of the 2 uploads finishes, then the 3rd one will start. This behavior does not happen for Internet Explorer. I have tried with a large number of files, and some big files, to make sure this behavior was consistent.

I was wondering if anyone noticed this behavior please, and if so, what is the reason for this behavior please?

I appreciate your help,

Thank you very much,

Rudy

Answer 1

There's a limited number of simultaneous connections to each host, which varies from browser to browser. This limit is generally discussed in the context of downloading many things (e.g. images) simultaneously from the server, but it seems to apply to uploads as well (this makes sense because connections are two-way).

Check out this related question, especially this answer that expands on what I've said here. It links to some useful articles.