https上的NSURLConnection同步请求

Question

Can anyone tell me the way how I can make a synchronous call to the https server? I am able to do asynchronous request on https server using following delegate methods.

- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace

and

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge

but I need to do synchronous.

Answer 1

//Encoding the request

NSData *postData = [xmlText dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

**//Calculating length of request**
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:requestUrlString]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/xml" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
NSURLResponse* response;
NSError* error = nil;

//Capturing server response
NSData* result = [NSURLConnection sendSynchronousRequest:request  returningResponse:&response error:&error];

Answer 2

+ (NSData *)sendSynchronousRequest:(NSURLRequest *)request returningResponse:(NSURLResponse **)response error:(NSError **)error

in NSUrlConnection should work just fine with https.

If you'd like to provide credentials, they need to be part of the url: ( https://username:password@domain.tld/api/user.json ).

There's no way to provide a NSURLConnection delegate, so if you need some nonstandard authentication handling you'll need to do it asynchronously.

Answer 3

That's how i did it: instead of

[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]

I made the same method instance based, on the containing class, since we will need a delegate. And don't make it singleton, so every connection has its independent variables, because, if we don't, and two connections happen to be called before the other finishes, then the received data and the handling of the loops will be intertwined irrecoverably.

[[ClassNameHere new] sendSynchronousRequest:request returningResponse:&response error:&error]

This way i can create an NSUrl connection and handle it (in a synchronous way, we'll see how) so i don't have to change any of the previously written code.

- (NSData *)sendSynchronousRequest:(NSURLRequest *)request returningResponse:(NSURLResponse *__strong*)response error:(NSError *__strong*)error
{
    _finishedLoading=NO;
    _receivedData=[NSMutableData new];
    _error=error;
    _response=response;

    NSURLConnection*con=[NSURLConnection connectionWithRequest:request delegate:self];
    [con start];
    CFRunLoopRun();

    return _receivedData;
}


- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace {
    return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
}

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge 
{
    //handle the challenge
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    *_response=response;
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [_receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    *_error=error;
    CFRunLoopStop(CFRunLoopGetCurrent());
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    CFRunLoopStop(CFRunLoopGetCurrent());
}

The trick was in the CFRunLoopRun() and CFRunLoopStop(CFRunLoopGetCurrent()) I hope it helps someone else in the futur.