Twitter api request using simple NSMutableURLRequest - objective-c

Question

I am trying to get a user latest twits , with a simple request but getting a code error 400 .
What am i missing with my request body ?
NSString *consumerKey = #"api key";
NSString *consumerSecret = #"api secret";
NSString *consumerKeyRFC1738 = [consumerKey stringByAddingPercentEscapesUsingEncoding:
NSASCIIStringEncoding];
NSString *consumerSecretRFC1738 = [consumerSecret stringByAddingPercentEscapesUsingEncoding:
NSASCIIStringEncoding];
NSString *concatKeySecret = [[consumerKeyRFC1738 stringByAppendingString:#":"] stringByAppendingString:consumerSecretRFC1738];
NSLog(#"-%#",concatKeySecret);
NSString *concatKeySecretBase64 = [[concatKeySecret dataUsingEncoding:NSUTF8StringEncoding] base64EncodedStringWithOptions:0];
NSMutableURLRequest *request = [NSMutableURLRequest
requestWithURL:[NSURL URLWithString:#"https://api.twitter.com/1.1/statuses/user_timeline.json?screen_name=twitterapi&count=2"]];
[request setHTTPMethod:#"POST"];
[request setValue:[#"Basic" stringByAppendingString:concatKeySecretBase64] forHTTPHeaderField:#"Authorization"];
[request setValue:#"application/x-www-form-urlencoded;charset=UTF-8" forHTTPHeaderField:#"Content-Type"];
NSString *str = #"grant_type=client_credentials";
NSData *httpBody = [str dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:httpBody];
//NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
NSHTTPURLResponse *response;
[NSURLConnection sendSynchronousRequest: request returningResponse: &response error: nil];
if ([response respondsToSelector:#selector(allHeaderFields)])
{
NSDictionary *dictionary = [response allHeaderFields];
NSLog(#"%#",dictionary);
NSLog(#"%#",response);
}
The respond giving me this :
<NSHTTPURLResponse: 0x10cc21ba0> { URL: https://api.twitter.com/1.1/statuses/user_timeline.json?screen_name=twitterapi&count=2 } { status code: 400, headers {
"Content-Encoding" = gzip;
"Content-Length" = 86;
"Content-Type" = "application/json; charset=utf-8";
.....
....

Answer 1

If it suits your needs, I'd recommend you using SLRequest. Please note that this framework will ask for permission to use the user's account.
NSURL *showUserURL = [NSURL URLWithString:#"https://api.twitter.com/1.1/statuses/user_timeline.json"];
NSDictionary *parameters = #{ #"screen_name": #"thestrayhotdog" };
SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeTwitter
requestMethod:SLRequestMethodGET
URL:showUserURL
parameters:parameters];
ACAccountStore *accountStore = [[ACAccountStore alloc] init];
ACAccountType *accountType = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];
[accountStore requestAccessToAccountsWithType:accountType options:nil completion:^(BOOL granted, NSError *error) {
if (granted) {
NSArray * accounts = [accountStore accountsWithAccountType:accountType];
if ([accounts count]) {
ACAccount *twitterAccount = [accounts firstObject];
request.account = twitterAccount;
[request performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *connectionError) {
NSLog(#"%#",[[NSString alloc] initWithData:responseData
encoding:NSUTF8StringEncoding]);
NSLog(#"Status code: %ld",(long)[urlResponse statusCode]);
NSError *error = nil;
id result = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&error];
if (error) {
// Handle error
}
// success;
}];
}
}
}];