带有基本身份验证挑战的NSURLSession [英] NSURLSession With Basic Authentication Challenge

问题描述

我搜索了stackoverflow中所有可用的解决方案.仍然对此感到困惑.
如果我有任何错误，请指出我.我收到401错误.

I searched all the solution avaliable in stackoverflow. Still confused with this.
Please point me if i am doing any mistake. I am getting 401 error.

NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL        URLWithString:@"http://qa.api.xxxxxx.com/v0/jobs/93033"]];
NSString *authStr = @"xxxxxxxx:xxxxxxxxxxx";
NSData *authData = [authStr dataUsingEncoding:NSUTF8StringEncoding];
NSString *authValue = [NSString stringWithFormat:@"Basic %@",[authData base64EncodedStringWithOptions:0]];
[request setValue:authValue forHTTPHeaderField:@"Authorization"];
request.HTTPMethod = @"GET";
[request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request addValue:@"application/json" forHTTPHeaderField:@"Accept"];
//create the task
NSURLSessionDataTask* task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
    if (httpResponse.statusCode == 200)
    {
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
        NSLog(@"%@",json);
        dispatch_async(dispatch_get_main_queue(), ^{
        });
    } else {
        // failure: do something else on failure
        NSLog(@"httpResponse code: %@", [NSString stringWithFormat:@"%ld", (unsigned long)httpResponse.statusCode]);
        NSLog(@"httpResponse head: %@", httpResponse.allHeaderFields);
        return;
    }

}];

[task resume];

推荐答案

也许您的请求通过NSURLSession自动生成的没有授权标头的新请求重定向到其他地方.

Perhaps your request is redirected to some where else with a new request which is auto-generated by NSURLSession without authorization header.

您可以使用Wireshark跟踪您的请求是否确实发生了.

You could use Wireshark to track your request exactly happened.

如果您的请求被重定向，则可以使用以下方法来确保新请求正在发送身份验证信息:

If your request is redirected, you can use the following methods to make sure the new request is sending with authentication information:

1.使用委托方法处理身份验证

- (void)URLSession:(NSURLSession *)session 
              task:(NSURLSessionTask *)task 
didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge 
 completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *))completionHandler {
    if (challenge.previousFailureCount > 1) {
        completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
    }else {
        NSURLCredential *credential = [NSURLCredential credentialWithUser:@"user"
                                                                 password:@"pswd"
                                                              persistence:NSURLCredentialPersistenceForSession];
        completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
    }
}

应该是处理身份验证的最佳方法.

Should be best way to handle authentications.

2.使用委托方法将身份验证标头添加到新请求中

- (void)URLSession:(NSURLSession *)session
              task:(NSURLSessionTask *)task
willPerformHTTPRedirection:(NSHTTPURLResponse *)response
        newRequest:(NSURLRequest *)request
 completionHandler:(void (^)(NSURLRequest *))completionHandler {
    NSMutableURLRequest *newRequest = request.mutableCopy;
    // Add authentication header here.
    completionHandler(newRequest);
}

当您的请求被重定向时，再次添加身份验证标头.

Add authentication header again when your request gets redirect.

3.将身份验证标头设置为NSURLSession的附加标头

NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
config.HTTPAdditionalHeaders = @{@"Authorization":@"Basic xxxxxxxxxxxxxxxxxx"};
NSURLSession *session = [NSURLSession sessionWithConfiguration:config];

确保NSURLSession使用该身份验证标头创建新请求.

Make sure NSURLSession creates new request with that authentication header.

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