NSURLConnection willSendRequest: not behaving as expected on a 302 response - no further response after nil return
NSURLConnection willSendRequest: not behaving as expected on a 302 response - no further response after nil return
- Subject: NSURLConnection willSendRequest: not behaving as expected on a 302 response - no further response after nil return
- From: Steve Mykytyn <email@hidden>
- Date: Sat, 4 Oct 2008 19:11:46 -0700
I'm using NSURLConnection to contact a URL that returns a 302
response along with some data, and then returns a 200 response with
some different data. I want to stop it at the 302 response and get
the data that comes along with the 302 response.
To make this happen I understand the delegate method [NSURLConnection
connection: willSendRequest: redirectResponse:] should return nil.
To quote the documentation:
"Alternatively, the delegate method can return nil to cancel the
redirect, and the connection will continue to process. This has
special relevance in the case where redirectResponse is not nil. In
this case, any data that is loaded for the connection will be sent to
the delegate, and the delegate will receive a
connectionDidFinishLoading or connection:didFailLoadingWithError:
message, as appropriate."
Using tcpdump I can see the 302 response come back, along with the
expected data, but I never receive anything from further from
NSURLConnection after I return the nil above. No "didReceiveData:";
or "connectionDidFinishLoading:" or
"connection:didFailLoadingWithError:" - zip, zilch, nada.
The code works fine for receiving 200 responses etc.
Suggestions please?
Slightly edited code below.
#pragma mark NSURLConnection delegate methods
- (NSCachedURLResponse *)connection:(NSURLConnection *)connection
willCacheResponse:(NSCachedURLResponse *)cachedResponse {
return nil; // NEVER cache responses
}
- (void)connection:(NSURLConnection *)connection didReceiveData:
(NSData *)data {
@try {
if ( connection && responseData ) [responseData appendData:data];
}
@catch ( NSException *e ) {
NSLog(@"exception during didReceiveData: %@", e);
}
}
- (NSURLRequest *)connection:(NSURLConnection *)connection
willSendRequest:(NSURLRequest *)request redirectResponse:
(NSURLResponse *)redirectResponse {
if(redirectResponse) {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)
redirectResponse;
statusCode = [httpResponse statusCode];
if (statusCode==302) newRequest = nil; // go for the first return only
}
return request;
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:
(NSURLResponse *)response {
@try {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
statusCode = [httpResponse statusCode];
if (httpResponse) { // we know this is an NSHTTPURLResponse since
we sent it to an http:// URL
if (pageRequest==1) { // this is the first page request - which
should just get the redirect info and go from there
statusCode = [httpResponse statusCode];
if (statusCode==302) {
if( connection && responseData ) [responseData setLength:0];
}
}
else if (pageRequest==2) { // this is the second page request
statusCode = [httpResponse statusCode];
if (statusCode==200) { // success ...
if( connection && responseData ) [responseData setLength:0];
}
}
}
}
@catch ( NSException *e ) {
NSLog(@"exception during didReceiveResponse: %@", e);
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{
@try {
NSString *tempString = [[NSString alloc] initWithData:responseData
encoding:NSMacOSRomanStringEncoding];
[dict setValue:responseData forKey:@"body"];
[dict setValue:tempString forKey:@"bodyString"];
[tempString release];
// [connection release];connection=nil;
[responseData release];
}
@catch ( NSException *e ) {
NSLog(@"exception during pageRequest %d connectionDidFinishLoading:
%@",pageRequest, e);
}
}
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