Sending Post http request from nsstring

Question

I have this json:

{"myFriends":{"userId":"the user id", "userName":"the user name", "friends":[{"u":"friend user id","n":"friend user name"},{"u":"friend user id","n":"friend user name"}]}}

and I want to send him in post request to the server, this is the current way I am trying to do this:

+(NSData *)postDataToUrl:(NSString*)urlString :(NSString*)jsonString
{
    NSData* responseData = nil;
    NSURL *url=[NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
    responseData = [NSMutableData data] ;
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
    NSString *bodydata=[NSString stringWithFormat:@"%@",jsonString];

    [request setHTTPMethod:@"POST"];
    NSData *req=[NSData dataWithBytes:[bodydata UTF8String] length:[bodydata length]];
    [request setHTTPBody:req];
    NSURLResponse* response;
    NSError* error = nil;
    responseData = [NSURLConnection sendSynchronousRequest:request     returningResponse:&response error:&error];
    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];

    NSLog(@"the final output is:%@",responseString);

    return responseData;
}

The json string contains the json, but for some reason the server always get nil and return error. How to fix this?

the error message is coming from the server and the message is only -1 — Amit Zoaretzs, Dec 18 '15 at 20:11
so the server is responding with 200 OK and a message that says -1? check what their API says about the message -1 — Mike S, Dec 18 '15 at 20:13
the message -1 means error- the error is that the server is getting nil and not the json that I send — Amit Zoaretzs, Dec 18 '15 at 20:16
' NSString *bodydata=[NSString stringWithFormat:@"%@",jsonString];' this is obsolete. — Gal, Dec 18 '15 at 20:31

Rudi Angela · Answer 1 · 2015-12-18T20:46:17.683

1

It would certainly help to tell your server about the content type:

[request addValue:@"application/json"
   forHTTPHeaderField:@"Content-Type"];

Furthermore: in my own code I use:

[request setHTTPBody:[bodydata dataUsingEncoding:NSUTF8StringEncoding]]

edited Dec 18 '15 at 20:46

answered Dec 18 '15 at 20:30

Rudi Angela

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I checked my own code and found another difference with yours (apart from the fact that I use NSURLSessionTask to fetch the stuff asynchronously). I have edited my answer accordingly. – Rudi Angela Dec 18 '15 at 20:47
do you have any other ideas? – Amit Zoaretzs Dec 18 '15 at 21:33
Sure. I suggest you replace the old NSURLConnection way of posting by the NSURLSession / NSURLSessionTask way, which is asychronous and takes some more work, but in the end is better for user experience. Please see my answer at http://stackoverflow.com/questions/31362790/convert-nsurlconnection-to-nsurlsessionuploadtask-example/31363308#31363308 – Rudi Angela Dec 19 '15 at 14:50

score 0 · Answer 2 · answered Dec 19 '15 at 03:03

This is my code for POST request with an NSData parameter:

- (void)uploadJSONData:(NSData*)jsonData toPath:(NSString*)urlString {

    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:kRequestTimeout];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody: data];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:[NSString stringWithFormat:@"%lu", (unsigned long)[data length]] forHTTPHeaderField:@"Content-Length"];

    // Create url connection and fire request
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
    [connection scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    [connection start];
}

This is for an asynchronous request, but it should work just fine for synchronous. The only thing I see you might be missing is the "Content-Length" parameter.

Uhm, NSURLConnection is deprecated. Please use NSURLSession instead. — HAS, Dec 19 '15 at 06:28

Sending Post http request from nsstring

2 Answers2