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PONSURLConnection sendSynchronousRequest: fails when using POST
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copied!<p>I'm using a custom NSURLCache to intercept calls for certain web pages in order to modify them dynamically. Inside cachedResponseForRequest: I modify the request, then send it out using sendSynchronousRequest. This works very well until you attempt to submit a form. If there is post data it fails.</p> <p>If i remove the HTTPBody and set the request to GET, it succeeds. But i need it to work with POST. If i send the request asynchronously it also works which is why i can't figure out why the synchronous request fails.</p> <p>Here's my stack trace:</p> <p>Date/Time: 2010-01-17 12:37:55.416 -0800<br> OS Version: iPhone OS 3.1.2 (7D11)<br> Report Version: 104 </p> <p>Exception Type: EXC_BAD_ACCESS (SIGBUS)<br> Exception Codes: KERN_PROTECTION_FAILURE at 0x0000001c<br> Crashed Thread: 2 </p> <p>Thread 2 Crashed:<br> 0 CFNetwork 0x0000b4e4 HTTPMessage::copyHeaderFieldValue(__CFString const*) + 18<br> 1 CFNetwork 0x0000b4c8 CFHTTPMessageCopyHeaderFieldValue + 16<br> 2 CFNetwork 0x0000e022 HTTPProtocol::createStream() + 328<br> 3 CFNetwork 0x0000de8a HTTPProtocol::createAndOpenStream() + 458<br> 4 CFNetwork 0x0000cba2 HTTPProtocol::startLoad() + 278<br> 5 CFNetwork 0x0000c8da URLConnectionLoader::loaderScheduleOriginLoad(_CFURLRequest const*) + 216<br> 6 CFNetwork 0x0000c77c URLConnectionLoader::loaderScheduleLoad(_CFURLRequest const*) + 280<br> 7 CFNetwork 0x0000c5e6 URLConnectionLoader::LoaderConnectionEventQueue::processAllEventsAndConsumePayload(XConnectionEventInfo<em>, long) + 134<br> 8 CFNetwork 0x0000c53a URLConnectionLoader::processEvents() + 60<br> 9 CFNetwork 0x0000a892 URLConnection::multiplexerClientPerform(RunLoopMultiplexer</em>) + 30<br> 10 CFNetwork 0x0000a812 MultiplexerSource::perform() + 86<br> 11 CFNetwork 0x0000a7b2 MultiplexerSource::_perform(void*) + 2<br> 12 CoreFoundation 0x000573a0 CFRunLoopRunSpecific + 1908<br> 13 CoreFoundation 0x00056c18 CFRunLoopRunInMode + 44<br> 14 Foundation 0x0005a998 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 172<br> 15 Foundation 0x00053ac6 -[NSThread main] + 42<br> 16 Foundation 0x00001d0e __NSThread__main__ + 852<br> 17 libSystem.B.dylib 0x0002b7b0 _pthread_body + 20 </p> <p>As you can see, copyHeaderFieldValue is causing the crash. What I don't understand is why.</p>

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