Hello!
We have a web application running on FreeBSD 7.4 (amd64) which uses
libcurl to send data to another system via HTTPS POST request. After I
upgraded curl from 7.19.6 to 7.24, a mysterious problem appeared. When
the length of the POSTed form exceeds 16121 bytes, sending the POST
request to another system fails (receiving system responds with Error
500 and writes in its log 'Invalid POST Request received'). Admin of
the receiving system says that his system never sees more than 16121
bytes of the incoming POST request.
The problem does not appear when sending requests over HTTP instead of
HTTPS, but this is no solution due to security requirements. Also I'm
told that the problem does not appear when sending requests with curl
7.24 on Linux (don't know which distro).
I downgraded curl back to 7.21.3, and the problem seems to have
disappeared. I have output of curl --trace from versions 7.24 and
7.21.3, but looking at these two outputs they seem rather similar to me.
Interesting thing is that both versions do seem to send the data in
two "batches", as seen in the output of --trace. In my test case,
after successful SSL negotioation, I see the following actions:
Send header, 263 bytes
Send data, 16121 bytes
Send data, 890 bytes
Note how the first "Send data" is 16121 bytes, which is also the size
limit where requests start to fail with curl 7.24. It seems that in
case of curl 7.24 the receiving server does not receive the second
part of "Send data" and thus sees the request as broken. But what is
actually the problem? I don't think I can remain with curl 7.21.3
indefinitely...
--
Toomas Aas
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