处理与NSURLSession的HTTP错误？
我试图发送一个HTTP请求与NSURLSession 。 它工作正常，但是当服务器没有响应我找不到HTTP错误代码的存储位置。 completionHandler的第三个参数只是一个非常通用的NSError 。 我读了NSURLResponse的参考，但什么都没发现。
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:[self postRequestWithURLString:apiEntry parameters:parameters] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { if(!error) NSLog([[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); } ]; [dataTask resume];
completionHandler的第二个参数是NSURLResponse ，它在做HTTP请求时通常是一个NSHTTPURLResponse 。 所以，你通常会这样做：
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:[self postRequestWithURLString:apiEntry parameters:parameters] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { // handle basic connectivity issues here if (error) { NSLog(@"dataTaskWithRequest error: %@", error); return; } // handle HTTP errors here if ([response isKindOfClass:[NSHTTPURLResponse class]]) { NSInteger statusCode = [(NSHTTPURLResponse *)response statusCode]; if (statusCode != 200) { NSLog(@"dataTaskWithRequest HTTP status code: %d", statusCode); return; } } // otherwise, everything is probably fine and you should interpret the `data` contents NSLog(@"data: %@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }]; [dataTask resume];
Swift 3：
// handle basic connectivity issues here guard error == nil else { print("Error: ", error!) return } // handle HTTP errors here if let httpResponse = response as? HTTPURLResponse { let statusCode = httpResponse.statusCode if (statusCode != 200) { print ("dataTaskWithRequest HTTP status code:", statusCode) return; } } if let data = data { // here, everything is probably fine and you should interpret the `data` contents }
如果从完成处理程序发生服务器端错误data参数可能包含一些有用的信息
一般来说，我瘦你应该实现URLSession:task:didCompleteWithError:从会议委托NSURLSessionTaskDelegate协议
docs： NSURLSessionTaskDelegate协议参考
您可以在allHeaderFields包含整个标头
let realResponse = response as? NSHTTPURLResponse realResponse.allHeaderFields
请将其转换为Objective-C。
你可以尝试这样的事情。 我创build了一个简单的方法，可以将数据发布到服务器并获得服务器响应。 您可以通过NSHTTPURLResponse类获取服务器状态码。 希望能帮到:)
-(void) POST:(NSURL *) url URLparameters:(NSString *) parameters success:(void (^)(NSURLSessionDataTask * task, id responseObject)) successHandler errorHandler:(void (^)(NSURLSessionDataTask * task, NSError * error)) errorHandler{ requestBody = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy: NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; [requestBody setHTTPMethod:@"POST"]; [requestBody setValue:@"application/json" forHTTPHeaderField:@"Accept"]; [requestBody setHTTPBody:[NSData dataWithBytes: [parameters UTF8String]length:strlen([parameters UTF8String])]]; NSURLSession *session = [NSURLSession sessionWithConfiguration: sessionConfiguration delegate: self delegateQueue: [NSOperationQueue mainQueue]]; NSURLSessionDataTask *task = [session dataTaskWithRequest:requestBody completionHandler: ^(NSData *data, NSURLResponse *response, NSError *error) { NSHTTPURLResponse* respHttp = (NSHTTPURLResponse*) response; if (respHttp.statusCode == SUCCESS) { NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error]; successHandler(task, dictionary); NSLog(@"HTTP_STATUS: success %@", response); }else if (respHttp.statusCode == UNAUTHORIZE) { NSLog(@"HTTP_STATUS: anauthorize"); }else if (respHttp.statusCode== BAD_REQUEST) { NSLog(@"HTTP_STATUS: badrequest"); }else if (respHttp.statusCode == INTERNAL_SERVER_ERROR) { NSLog(@"HTTP_STATUS: internalerror"); }else if (respHttp.statusCode== NOT_FOUND) { NSLog(@"HTTP_STATUS: internalerror"); } errorHandler(task, error); return; }]; [task resume]; }