Why “Content-Length: 0” in POST requests?

Question

A customer sometimes sends POST requests with Content-Length: 0 when submitting a form (10 to over 40 fields).

We tested it with different browsers and

Answer 1

This is a known problem for Internet explorer 6, but not for 7 that I know of. You can install this fix for the IE6 KB831167 fix.

You can read more about it here.

Some questions for you:

• Do you know which type of proxy?
• Do you know if there is an actual body sent in the request?
• Does it happen consistently every time? Or only sometimes?
• Is there any binary data sent in the request? Maybe the data starts with a \0 and the proxy has a bug with binary data.