POST method resulting status code 400 ios - ios

Question

I have tried many times, but i cant do a simple POST request to a remote API.. I need to post username and password to get a login authorization. Here are the code:
NSURL * url = [NSURL URLWithString:#"http://thapi.xyz/auth/login"];
NSString *postData = #"username=emailExample#gmail.com&password=123456";
NSData * dataBody = [postData dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
NSString *postLenght = [NSString stringWithFormat:#"%d",[dataBody length]];
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/x-www-form-unlencoded" forHTTPHeaderField:#"Content-Type"];
[request setValue:postLenght forHTTPHeaderField:#"Content-Lenght"];
[request setHTTPBody:dataBody];
[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc]init] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
NSLog(#" ERROR %#, RESPONSE %# AND DATA %#",connectionError,response,[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]);
}];
I have made another version, witch uses NSDictionary and Json parsing (the API uses json)
NSDictionary * login = #{#"username":#"exampleMail#gmail",#"password":#"123456"};
NSData * jsonData = [NSJSONSerialization dataWithJSONObject:login options:NSJSONWritingPrettyPrinted error:nil];
NSString *postLenght = [NSString stringWithFormat:#"%d",[jsonData length]];
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/x-www-form-unlencoded" forHTTPHeaderField:#"Content-Type"];
[request setValue:postLenght forHTTPHeaderField:#"Content-Lenght"];
[request setHTTPBody:jsonData];
[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc]init] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
NSLog(#" ERROR %#, RESPONSE %# AND DATA %#",connectionError,response,[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]);
}];
And here is the result of both codes:
2016-06-18 05:24:20.329 Hoffmann iOS[10317:1088208]
ERROR (null), RESPONSE <NSHTTPURLResponse: 0x796bee60>
{ URL: http://thapi.xyz/auth/login } { status code: 400, headers {
"Access-Control-Allow-Origin" = "*";
Connection = "keep-alive";
"Content-Length" = 70;
"Content-Type" = "application/json; charset=utf-8";
Date = "Sat, 18 Jun 2016 04:24:18 GMT";
Etag = "W/\"46-22Kcj8zTKrWgQ7OCr429+w\"";
Server = "nginx/1.6.2";
Vary = "Accept-Encoding";
"X-Powered-By" = undefined;
"X-Response-Time" = "5.357ms";
} } AND DATA {"name":"ParameterError","message":"Request should contain: username"}
I really appreciate all answers, and sorry for my bad english...

Answer 1

Perhaps the misspelling of the header variable is the issue ("Content-Lenght" is misspelled):
[request setValue:postLenght forHTTPHeaderField:#"Content-Length"];

Answer 2

NSURLConnection is deprecated. use nsurlsession instead Try this code....
//replace the following code with your request params
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *clientSessionId = [prefs stringForKey:#"clientSession"];
NSString *bodyString = [NSString stringWithFormat:#"[\"%#\",{\"session_token\":\"%#\",\"request\":[\"GetUnitDetails\",{}]}]",clientSessionId,clientSessionId];
//Make mutable url request
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[Settings getMobileUrl]]];
NSData *postData = [bodyString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
[request setHTTPBody:postData];
//Change the http method as per your own choice
[request setHTTPMethod:#"POST"];
NSString *postLength = [NSString stringWithFormat:#"%lu", (unsigned long)[postData length]];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data,NSURLResponse *response,NSError *connectionError)
{
if ([data length] > 0 && connectionError == nil)
{
NSError *localError = nil;
self.parsedObject = [NSJSONSerialization JSONObjectWithData:data options:0 error:&localError];
NSString* unitResponse = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSData *jsonData = [unitResponse dataUsingEncoding:NSUTF8StringEncoding];
NSMutableArray *jsonDic = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments error:nil];
}else {
NSLog(#"No response received");
}
}]resume];

Answer 3

You could try using a NSDictionary for the parameters. The following will send the parameters correctly to a JSON server.
NSError *error;
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
NSURL *url = [NSURL URLWithString:#"http://thapi.xyz/auth/login"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
[request addValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request addValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setHTTPMethod:#"POST"];
NSDictionary *login = [[NSDictionary alloc] initWithObjectsAndKeys: #"username":#"exampleMail#gmail",#"password":#"123456",
nil];
NSData *postData = [NSJSONSerialization dataWithJSONObject:login options:0 error:&error];
[request setHTTPBody:postData];
NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
}];
[postDataTask resume];
Hope this works Properly...:)

Answer 4

try also to correct "setValue:postLenght", since I guess that doesn't exist, and will probably set Content-Length to 0.