Restkit POST 操作服务器超时

Question

我正在尝试使用 Restkit 0.22.0 向 Web 服务发送 POST 请求。我已经设置了请求描述符和响应描述符，并且正在发送请求，但是服务器永远不会获取有效负载（或者不“知道”有效负载的结束位置），因此不会返回到我的应用程序。结果是 60 秒后服务器超时。

在设置请求描述符或请求时，我缺少一些东西。看起来，服务器要么根本没有得到任何有效载荷，要么不知道有效载荷何时结束，要么是由于 http 标头中缺少 content-length 属性，要么是由于缺少“流结束”标志。

如果我对邮递员进行同样的尝试，它会起作用。

我在 Xcode 日志中看到的是：

   2014-03-15 20:43:14.819 testIOS[52095:60b] T restkit.network:RKObjectRequestOperation.m:148 POST 'http://api.test.com:3000/0.1/user/':
   request.headers={
    Accept = "application/json";
    "Accept-Language" = "en;q=1, fr;q=0.9, de;q=0.8, zh-Hans;q=0.7, zh-Hant;q=0.6, ja;q=0.5";
    "Content-Type" = "application/json; charset=utf-8";
    "User-Agent" = "testIOS/1 (iPhone Simulator; iOS 7.1; Scale/2.00)";
    "X-NewRelic-ID" = "UAEBVFNWGwAEV1ZQBgM=";
   }
   request.body={"name":"alex"}

到目前为止看起来它是正确的，虽然我不知道这个 request.body 是否像这样正确格式化。 然后需要 60 秒，直到我在日志窗口中得到下一个输出并出现以下错误：

2014-03-15 20:44:14.948 testIOS[52095:3707] E restkit.network:RKObjectRequestOperation.m:547 Object request failed: Underlying HTTP request operation failed with error: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0xd342700 {NSErrorFailingURLStringKey=http://api.test.com:3000/0.1/user/, NSErrorFailingURLKey=http://api.test.com:3000/0.1/user/, NSLocalizedDescription=The request timed out., NSUnderlyingError=0xd656c20 "The request timed out."}
2014-03-15 20:44:14.949 testIOS[52095:3707] E restkit.network:RKObjectRequestOperation.m:208 POST 'http://api.test.com:3000/0.1/user/' (0 / 0 objects) [request=60.1298s mapping=0.0000s total=60.1320s]:
error=Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0xd342700 {NSErrorFailingURLStringKey=http://api.test.com:3000/0.1/user/, NSErrorFailingURLKey=http://api.test.com:3000/0.1/user/, NSLocalizedDescription=The request timed out., NSUnderlyingError=0xd656c20 "The request timed out."}
response.body=(null)
2014-03-15 20:44:14.950 testIOS[52095:60b] error is: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0xd342700 {NSErrorFailingURLStringKey=http://api.test.com:3000/0.1/user/, NSErrorFailingURLKey=http://api.test.com:3000/0.1/user/, NSLocalizedDescription=The request timed out., NSUnderlyingError=0xd656c20 "The request timed out."}

这里是代码（我认为这一定是错误的地方或遗漏了重要的部分）：

+ (void)setupRK
{
    RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];

    objectManager.requestSerializationMIMEType = RKMIMETypeJSON;

    [objectManager.HTTPClient setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        if (status == AFNetworkReachabilityStatusNotReachable) {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No network connection"
                                                            message:@"You must be connected to the internet to use this app."
                                                           delegate:nil
                                                  cancelButtonTitle:@"OK"
                                                  otherButtonTitles:nil];
            [alert show];
        }
    }];

    [RKObjectManager setSharedManager:objectManager];

    // Log all HTTP traffic with request and response bodies
    RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);
}

+ (RKObjectRequestOperation *)loginRKOperationForUser:(STF_RKObj_User *)user
{
    RKObjectManager *objectManager = [RKObjectManager sharedManager];

    RKObjectMapping *userMapping = [STF_RKObj_User objectMapping];
    NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful);
    RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:userMapping method:RKRequestMethodAny pathPattern:nil keyPath:nil statusCodes:statusCodes];
    [objectManager addResponseDescriptor:responseDescriptor];

    RKObjectMapping *objMapping = [STF_RKObj_User objectMapping];
    RKRequestDescriptor *reqDescr = [RKRequestDescriptor requestDescriptorWithMapping:[objMapping inverseMapping] objectClass:[STF_RKObj_User class] rootKeyPath:nil method:RKRequestMethodPOST];
    [objectManager addRequestDescriptor:reqDescr];

    NSMutableURLRequest *request = [objectManager requestWithObject:user method:RKRequestMethodPOST path:@"user/" parameters:nil];

    RKObjectRequestOperation *operation = [[RKObjectRequestOperation alloc] initWithRequest:request responseDescriptors:@[responseDescriptor]];

    return operation;
}

然后像这样从另一个类调用它：

- (void)loginWithUserObject:(STF_RKObj_User *)userObj
{
    RKObjectRequestOperation *operation = [STF_REST_Operations loginRKOperationForUser:userObj];
    [operation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
        NSLog(@"mappingResult: %@", mappingResult);
    } failure:^(RKObjectRequestOperation *operation, NSError *error) {

        [self logoutUser];

        self.loginCallback(NO, error);
        [self setLoginCallback:nil];

    }];

    [operation start];
}

我一生都无法弄清楚我错过了什么。整天在谷歌上搜索...帮助...

TIA

更新：

唷，我现在不需要后端程序员的帮助，只需将 requestSerializationMIMEType 设置为 @"text/plain" 就可以工作了。

[RKMIMETypeSerialization registerClass:[RKNSJSONSerialization class] forMIMEType:@"text/plain"];
sharedManager.requestSerializationMIMEType = @"text/plain";

这显然不是一个正确的服务器设置，因为在 Restkit 框架中没有用于“文本/纯文本”的 mime 类型的常量。如果我只是将 requestSerializationMIMEType 设置为“text/plain”的“任意值”，这给我留下了一个问题，是否“坏事会发生在我身上”。现在它可以工作，但我以后会遇到新问题吗？

（非常感谢 Wain 为我指明了正确的方向并建议使用 Charles！）

Answer 1

所以要回答我自己的问题，后端服务器设置要求我将 requestSerializationMIMEType 设置为 @"text/plain"。

[RKMIMETypeSerialization registerClass:[RKNSJSONSerialization class] forMIMEType:@"text/plain"];
sharedManager.requestSerializationMIMEType = @"text/plain";

我不确定更好的解决方案是否是更改后端服务器设置，因为它似乎并不常见，它只适用于 @"text/plain"。当@"text/plain" 甚至没有常量时。我将为此打开另一个单独的问题。