我正在尝试使用 OAuthConsumer 将图像发布到 TwitPic。我不断收到 401“无法验证您的身份（标题被 twitter 拒绝）”。错误。
我还利用 Twitter+OAuth 库来处理登录和发布常规推文，然后保存令牌和令牌密码以与 TwitPic 一起使用。
这是我使用构造请求的代码：
NSURL *twitpicUrl = [NSURL URLWithString:@"http://api.twitpic.com/2/upload.json"];
NSString* realm = @"http://api.twitter.com/";
OAToken* oaToken = [[OAToken alloc] initWithKey:savedToken secret:savedTokenSecret];
OAConsumer* oaConsumer = [[OAConsumer alloc] initWithKey:kOAuthConsumerKey secret:kOAuthConsumerSecret];
OAMutableURLRequest *request = [[[OAMutableURLRequest alloc] initWithURL:twitpicUrl consumer:oaConsumer
token:oaToken realm:realm signatureProvider:nil] autorelease];
[request prepare];
[request setHTTPMethod:@"POST"];
[request setValue:@"https://api.twitter.com/1/account/verify_credentials.json" forHTTPHeaderField:@"X-Auth-Service-Provider"];
NSString* authorizeHeader = [request valueForHTTPHeaderField:@"Authorization"];
[request setValue:authorizeHeader forHTTPHeaderField:@"X-Verify-Credentials-Authorization"];
如果我打印出我的标题，这就是我得到的（不包括未使用的 Authorization 标题）：
"X-Auth-Service-Provider" = "https://api.twitter.com/1/account/verify_credentials.json";
"X-Verify-Credentials-Authorization" = "OAuth realm=\"http%3A%2F%2Fapi.twitter.com%2F\", oauth_consumer_key=\"JOvwW7mtZUjRXZRInkQI7w\", oauth_token=\"293217559-pD0HL0oE6TZSkU35mPnc7kia325oPDgMfQMTVArK\", oauth_signature_method=\"HMAC-SHA1\", oauth_signature=\"ctmCK35JFwx8qs8lQj0AYB6sUr4%3D\", oauth_timestamp=\"1304580843\", oauth_nonce=\"7EBE3EB0-641A-40EA-A57C-8D071B5E647F\", oauth_version=\"1.0\"";
我收到的错误是：
Error: The operation couldn’t be completed. (NSURLErrorDomain error -1012.)
{"errors":[{"code":401,"message":"Could not authenticate you (header rejected by twitter)."}]}
我在这里排除了一些细节，特别是附加帖子数据，主要是因为我认为它与错误无关。如果您不这么认为，请告诉我，我会更新问题。
任何人都可以帮忙吗？
更新：这是我现在成功使用的代码
在标题中：
#define kVerifyCredentialsUrl @"https://api.twitter.com/1/account/verify_credentials.json"
#define kTwitPicUrl @"http://api.twitpic.com/2/upload.json"
执行：
//prepare the verify credentials header
NSURL* serviceUrl = [NSURL URLWithString:kVerifyCredentialsUrl];
NSString* realm = @"http://api.twitter.com/";
OAToken* token = [[OAToken alloc] initWithKey:tokenKey secret:tokenSecret];
OAConsumer* consumer = [[OAConsumer alloc] initWithKey:kOAuthConsumerKey secret:kOAuthConsumerSecret];
OAMutableURLRequest *request = [[OAMutableURLRequest alloc] initWithURL:serviceUrl consumer:consumer token:token realm:realm signatureProvider:nil];
[request setHTTPMethod:@"GET"];
[request prepare];
NSDictionary* headerDictionary = [request allHTTPHeaderFields];
NSString* oAuthHeader = [NSString stringWithString:[headerDictionary valueForKey:@"Authorization"]];
[request release];
request = nil;
//prepare the full request
serviceUrl = [NSURL URLWithString:kTwitPicUrl];
request = [[OAMutableURLRequest alloc] initWithURL:serviceUrl consumer:consumer token:token realm:realm signatureProvider:nil];
[request setHTTPMethod:@"POST"];
[request setValue:kVerifyCredentialsUrl forHTTPHeaderField:@"X-Auth-Service-Provider"];
[request setValue:oAuthHeader forHTTPHeaderField:@"X-Verify-Credentials-Authorization"];
//add the content and start the request
UIImage* imageToUpload = [UIImage imageNamed:@"test.png"];
NSData *data = UIImagePNGRepresentation(imageToUpload);
ASIFormDataRequest *asiRequest = [[[ASIFormDataRequest alloc] initWithURL:[NSURL URLWithString:kTwitPicUrl]] autorelease];
[asiRequest addRequestHeader:@"X-Auth-Service-Provider" value:kVerifyCredentialsUrl];
[asiRequest addRequestHeader:@"X-Verify-Credentials-Authorization" value:oAuthHeader];
[asiRequest setPostValue:@"Message here" forKey:@"message"];
[asiRequest setPostValue:kTwitPicAPIKey forKey:@"key"];
[asiRequest setData:data forKey:@"media"];
[asiRequest setDidFinishSelector:@selector(requestDone:)];
[asiRequest setDidFailSelector:@selector(requestWentWrong:)];
[asiRequest setDelegate:self];
[asiRequest startAsynchronous];