如何使用 AFJSONRequestOperation 获取 HTTP 响应

Posted 2023-03-16

【中文标题】如何使用 AFJSONRequestOperation 获取 HTTP 响应

【英文标题】：How to get HTTP response with AFJSONRequestOperation

【发布时间】：2013-06-12 22:00:11

【问题描述】：

将 json 数据发送到服务器并希望使用 AFNetworking 从服务器获取正确的 response.statusCode

服务器：

// Helper method to send a HTTP response code/message
function sendResponse($status = 200, $body = '', $content_type = 'text/html')

    $status_header = 'HTTP/1.1 ' . $status . ' ' . getStatusCodeMessage($status);
    header($status_header);
    header('Content-type: ' . $content_type);
    echo $body;
 
sendResponse(200, json_encode("Files Deleted"));

ios：

NSURL *url = [NSURL URLWithString:server];
        AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];
        // don't forget to set parameterEncoding!
        httpClient.parameterEncoding = AFJSONParameterEncoding;\
        NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST" path:deleteExtraFilesIn parameters:nil];
        [request setHTTPBody:[displayJson  dataUsingEncoding:NSUTF8StringEncoding]];
        [request addValue:@"ASIHTTPRequest" forHTTPHeaderField:@"User-Agent"];
        [request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
        NSLog(@"request %@",request);
        [AFJSONRequestOperation addAcceptableContentTypes:[NSSet setWithObject:@"text/html"]];
        AFHTTPRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:nil failure:nil];

        [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id response) 
            // Print the response body in text
            if (operation.response.statusCode == 200) 
                NSLog(@"Got you");

            
         failure:^(AFHTTPRequestOperation *operation, NSError *error) 
NSLog(@"Error: %@", error);
        ];
        [operation start];

错误 NSLOG：

Error: Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x1f519df0 NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.

如何在上述代码中获得正确的 http 响应？

注意：服务器上的json_encode("Files Deleted") 只是虚拟文本，我想要的是 http 响应代码。

【参考方案1】：

需要设置操作允许分片：

        AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:nil failure:nil];
operation.JSONReadingOptions = NSJSONReadingAllowFragments;

【讨论】：

xcode 说在“AFHTTPRequestOperation”类型的对象上找不到属性“JSONReadingoptios”，它属于哪个类？

您只需要不将实例存储为 AFHTTPRequestOperation，而是将其存储为真正的 AFJSONRequestOperation。