Why does my NSMutableURLRequest fail?

Question

I'm trying to get data from the server but I get error message that {"Message":"Wrong Process.","Success":false,"Cookie":null} from the server while I run the same link in the server test client and I get the right result. So please where would be my issue in my code please?

The Key is data

The value is <r_PM act=\\"par\\"/>

- (void)viewDidLoad {

    [super viewDidLoad];

    NSMutableURLRequest *postRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.example.com/service/par.ashx"]];

    NSString *message = [[NSString alloc] initWithFormat:@"data=<r_PM act=\"par\"/>"];

    NSString *msgLength = [NSString stringWithFormat:@"%lu",(unsigned long)[message length]];

    [postRequest addValue:@"application/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [postRequest addValue:msgLength                         forHTTPHeaderField:@"Content-Length"];

    [postRequest setHTTPMethod:@"POST"];
    [postRequest setHTTPBody:[message dataUsingEncoding:NSUTF8StringEncoding]];

    NSURLConnection * connection = [[NSURLConnection alloc]
                                    initWithRequest:postRequest
                                    delegate:self startImmediately:NO];

    [connection scheduleInRunLoop:[NSRunLoop mainRunLoop]
                          forMode:NSDefaultRunLoopMode];
    [connection start];

    NSURLResponse *response;
    NSError *err;

    responseData = [NSURLConnection sendSynchronousRequest:postRequest returningResponse:&response error:&err];

    NSLog(@"responseData is: %@", responseData);

    NSString* newStr = [[NSString alloc] initWithData:responseData encoding: ];

    NSLog(@"Results : %@", newStr);

}

Answer 1

You are creating a request whose content-type is XML, but whose request body is not. The "data=..." format is not XML. In the absence of API documentation or sample code that generates a valid request, it's going to be hard for us to help you.

As an aside, your Objective-C code is issuing the request twice, one using the delegate-based NSURLConnection (for which you haven't shared your delegate implementation) and then again with sendSynchronousRequest . Only issues this once. And if you like the simplicity of the sendSynchronousRequest method, I'd suggest you use its sendAsynchronousRequest sibling, which is also pretty convenient, but isn't synchronous.

---

Offline, by examining request you were sending from another tool, we confirmed that the issue was that

• Request is application/x-www-form-urlencoded not application/xml

  Thus, replace Content-Type line with:

   [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; 

• The data has to be percent escaped, eg:

   NSString *value = @"<r_PM act=\\"par\\"/>"; NSString *message = [NSString stringWithFormat:@"data=%@", [self percentEscapeString:value]]; 

  where, the percent escaping routine might be something like:

   - (NSString *)percentEscapeString:(NSString *)string { NSString *result = CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, (CFStringRef)@" ", (CFStringRef)@":/?@!$&'()*+,;=", kCFStringEncodingUTF8)); return [result stringByReplacingOccurrencesOfString:@" " withString:@"+"]; }