how to read headers from http request?

[Anon]

Is there a way to read the http headers sent from a request on a different server?

For example, if my script posts data to a processing server then, depending on the querystring returned, goes on to do additional processing. There appears to be occasions where the request timesout -- ie, nothing is returned from the processing server.

How do I track this to isolate the times when this happens? Using the header() function doesn't seem to be the right answer.

You advice will be greatly appreciated.

Thanks,

Andrew