他,
我正在努力向解析 REST API 发出 POST 请求。我正在使用 AFNetworking 2.0。我的 AFHTTPSessionManager 子类代码如下所示:
+ (ParseAPISession *)sharedSession {
static ParseAPISession *sharedSession = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedSession = [[ParseAPISession alloc] initWithBaseURL:[NSURL URLWithString:kSDFParseAPIBaseURLString]];
});
return sharedSession;
}
和:
- (id)initWithBaseURL:(NSURL *)url {
self = [super initWithBaseURL:url];
if (self) {
[self.requestSerializer setValue:kSDFParseAPIApplicationId forHTTPHeaderField:@"X-Parse-Application-Id"];
[self.requestSerializer setValue:kSDFParseAPIKey forHTTPHeaderField:@"X-Parse-REST-API-Key"];
}
return self;
}
我正在做这样的请求:
[[ParseAPISession sharedSession] POST:@"ClassName" parameters: [NSDictionary dictionaryWithObjectsAndKeys:@"name", @"name", nil]
success:^(NSURLSessionDataTask *task, id abc) {
NSLog(@"%@", abc);
} failure:^(NSURLSessionDataTask *task, NSError *error) {
NSLog(@"%@", error);
}];
这样做我总是会遇到这种错误:
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=0x8c72420 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}
由于 GET 请求就像一个魅力,我很困惑为什么我不能发布一些东西。谁能帮我解决这个问题?
最好的问候!
更新
幸运的是,经过大量测试后,此错误消息不再显示,不幸的是,另一个错误消息出现了:
<NSHTTPURLResponse: 0x8b96d40>
{ URL: https://api.parse.com/1/users }
{ status code: 400,
headers {
"Access-Control-Allow-Origin" = "*";
"Access-Control-Request-Method" = "*";
"Cache-Control" = "no-cache";
Connection = "keep-alive";
"Content-Length" = 130;
"Content-Type" = "application/json; charset=utf-8";
Date = "Wed, 30 Oct 2013 20:01:58 GMT";
Server = "nginx/1.4.2";
"Set-Cookie" = "_parse_session=BAh7BkkiD3Nlc3Npb25faWQGOgZFRiIlNjIxZjUxMzY3NWVhZWJmMDYyYWYwMGJiZTQ3MThmMWE%3D--851bd31b07e7dba2c5f83bb13a8d801ecbea42c4; domain=.parse.com; path=/; expires=Fri, 29-Nov-2013 20:01:58 GMT; secure; HttpOnly";
Status = "400 Bad Request";
"X-Runtime" = "0.060910";
"X-UA-Compatible" = "IE=Edge,chrome=1";
} }
任何人都可以告诉我 Status: 400 Bad Request 告诉我什么以及我如何摆脱它?
最佳答案
此错误意味着您的 POST 请求已通过,服务器已成功返回一些数据,NSJSONSerialization
解析时遇到问题。
您可能需要设置您的 AFJSONResponseSerializer
以允许 JSON 片段。
在 AFHTTPSessionManager
子类的 init
方法中:
AFJSONResponseSerializer *responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments];
[self setResponseSerializer:responseSerializer];
如果这不起作用,您可能遇到了编码问题。来自 NSJSONSerialization
类引用:
The data must be in one of the 5 supported encodings listed in the JSON specification: UTF-8, UTF-16LE, UTF-16BE, UTF-32LE, UTF-32BE. The data may or may not have a BOM. The most efficient encoding to use for parsing is UTF-8, so if you have a choice in encoding the data passed to this method, use UTF-8.
检查服务器发送的编码类型。
最后,您可以在 AFNetworking 内部设置断点,或者设置 AFNetworkActivityLogger ,这将记录请求发送和接收到您的控制台。此工具对于调试此类问题非常有用。
关于objective-c - AFNetworking 2.0 的 POST 请求 - AFHTTPSessionManager,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19680193/