使用NSURLSession发送POST请求

Question

我正在尝试使用对远程REST API执行POST请求NSURLSession。这个想法是使用两个参数发出请求：deviceId和textContent。问题是服务器无法识别这些参数。服务器部分正常工作，因为我已经使用POSTMAN发送了适用于Google Chrome的POST，并且工作正常。这是我现在正在使用的代码：NSString *deviceID = [[NSUserDefaults standardUserDefaults] objectForKey:@"deviceID"];NSString *textContent = @"New note";NSString *noteDataString = [NSString stringWithFormat:@"deviceId=%@&textContent=%@", deviceID, textContent];NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];sessionConfiguration.HTTPAdditionalHeaders = @{                                               @"api-key"       : @"API_KEY",                                               @"Content-Type"  : @"application/json"                                               };NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration];NSURL *url = [NSURL URLWithString:@"http://url_to_manage_post_requests"];NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];request.HTTPBody = [noteDataString dataUsingEncoding:NSUTF8StringEncoding];request.HTTPMethod = @"POST";NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {    // The server answers with an error because it doesn't receive the params}];[postDataTask resume];我已经尝试了相同的过程NSURLSessionUploadTask：// ...NSURL *url = [NSURL URLWithString:@"http://url_to_manage_post_requests"];NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];request.HTTPMethod = @"POST";NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request fromData:[noteDataString dataUsingEncoding:NSUTF8StringEncoding] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {    // The server answers with an error because it doesn't receive the params}];[uploadTask resume];有任何想法吗？

Answer 1

我的方法的问题在于，我在发送Content-Type所有请求时都发送了不正确的标头。因此，代码正常运行所需的唯一更改是删除Content-Type = application/jsonHTTP标头。因此正确的代码是这样的：

NSString *deviceID = [[NSUserDefaults standardUserDefaults] objectForKey:@"deviceID"];

NSString *textContent = @"New note";

NSString *noteDataString = [NSString stringWithFormat:@"deviceId=%@&textContent=%@", deviceID, textContent];

NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];

sessionConfiguration.HTTPAdditionalHeaders = @{

                                               @"api-key"       : @"API_KEY"

                                               };

NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration];

NSURL *url = [NSURL URLWithString:@"http://url_to_manage_post_requests"];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

request.HTTPBody = [noteDataString dataUsingEncoding:NSUTF8StringEncoding];

request.HTTPMethod = @"POST";

NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

    // The server answers with an error because it doesn't receive the params

}];

[postDataTask resume];

发送图像以及其他参数

如果您需要使用NSURLSession此处发布图像以及其他参数，请举一个例子：

NSString *deviceID = [[NSUserDefaults standardUserDefaults] objectForKey:@"deviceID"];

NSString *textContent = @"This is a new note";

// Build the request body

NSString *boundary = @"SportuondoFormBoundary";

NSMutableData *body = [NSMutableData data];

// Body part for "deviceId" parameter. This is a string.

[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", @"deviceId"] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithFormat:@"%@\r\n", deviceID] dataUsingEncoding:NSUTF8StringEncoding]];

// Body part for "textContent" parameter. This is a string.

[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", @"textContent"] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithFormat:@"%@\r\n", textContent] dataUsingEncoding:NSUTF8StringEncoding]];

// Body part for the attachament. This is an image.

NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:@"ranking"], 0.6);

if (imageData) {

    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n", @"image"] dataUsingEncoding:NSUTF8StringEncoding]];

    [body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

    [body appendData:imageData];

    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

}

[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

// Setup the session

NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];

sessionConfiguration.HTTPAdditionalHeaders = @{

                                               @"api-key"       : @"55e76dc4bbae25b066cb",

                                               @"Accept"        : @"application/json",

                                               @"Content-Type"  : [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary]

                                               };

// Create the session

// We can use the delegate to track upload progress

NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration delegate:self delegateQueue:nil];

// Data uploading task. We could use NSURLSessionUploadTask instead of NSURLSessionDataTask if we needed to support uploads in the background

NSURL *url = [NSURL URLWithString:@"URL_TO_UPLOAD_TO"];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

request.HTTPMethod = @"POST";

request.HTTPBody = body;

NSURLSessionDataTask *uploadTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

    // Process the response

}];

[uploadTask resume];

Answer 2

您可以尝试使用NSDictionary作为参数。以下内容会将参数正确发送到JSON服务器。

NSError *error;

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];

NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];

NSURL *url = [NSURL URLWithString:@"[JSON SERVER"];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url

                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy

                                                   timeoutInterval:60.0];

[request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

[request addValue:@"application/json" forHTTPHeaderField:@"Accept"];

[request setHTTPMethod:@"POST"];

NSDictionary *mapData = [[NSDictionary alloc] initWithObjectsAndKeys: @"TEST IOS", @"name",

                     @"IOS TYPE", @"typemap",

                     nil];

NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];

[request setHTTPBody:postData];

NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

}];

[postDataTask resume];

希望这会有所帮助（我正在尝试使用上述方法对CSRF真实性问题进行分类-但它确实在NSDictionary中发送了参数）。