身份验证challange iOS发出错误401

Question

我的应用正在与SharePoint站点通信，所以我使用身份验证质询来传递身份验证以使用SharePoint。

所有Web服务都得到正确的响应，但是当我试图下载图像，它会给我401（身份验证失败）错误约2至5倍，然后它会得到成功响应200

下面是代码：

-(void)getResponseArray:(NSString *)urlstring SoapMessage:(NSString *)soapMessage SoapAction:(NSString *)soapAction1 
{ 
self.urlString = urlstring; 
NSString *fullsoapMessage = [NSString stringWithFormat:@"<?xml version='1.0' encoding='utf-8'?><soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'><soap:Body>%@</soap:Body></soap:Envelope>", soapMessage]; 

if(IS_DEBUG) 
    NSLog(@"The request: %@", fullsoapMessage); 

NSURL *webserviceurl = [NSURL URLWithString:urlstring]; 
if (request == nil) { 
    request = [[NSMutableURLRequest alloc]initWithURL:webserviceurl]; 
}else{ 
    [request setURL:webserviceurl]; 
} 

NSString *msglength = [NSString stringWithFormat:@"%d", fullsoapMessage.length]; 
[request addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"]; 
[request addValue:soapAction1 forHTTPHeaderField:@"SOAPAction"]; 
[request addValue:msglength forHTTPHeaderField:@"Content-Length"]; 
[request setHTTPMethod:@"POST"]; 
[request setHTTPBody:[fullsoapMessage dataUsingEncoding:NSUTF8StringEncoding]]; 
[request setTimeoutInterval:10000]; 

NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self]; 
if (conn) { 
    webData = [[NSMutableData alloc] init]; 
}else{ 
    if(IS_DEBUG) 
     NSLog(@"Connection is NULL"); 
} 
} 


    -(BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace { 

    return YES; 

    } 



    -(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge { 



if ([challenge previousFailureCount] == 0) 

{ 

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; 

    NSString *username = [userDefaults valueForKey:KEY_ADMIN_USERNAME]; 

    NSString *password = [userDefaults valueForKey:KEY_ADMIN_PASSWORD]; 



    NSURLCredential *newCredential; 

    newCredential = [NSURLCredential credentialWithUser:username password:password persistence:NSURLCredentialPersistenceNone]; 

    [[challenge sender] useCredential:newCredential forAuthenticationChallenge:challenge]; 

} else { 

    [[challenge sender] cancelAuthenticationChallenge:challenge]; 

     } 

    } 

任何一个请建议我一些解决方案：

1. 如何使用NSURLAuthenticationChallenge，以便SharePoint站点在首次请求请求时接受凭据，并且由于身份验证失败而得到响应200而不发生请求失败。

在此先感谢。

Answer 1

将此授权标题添加到NSMutableURLRequest。试试这个。

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; 
NSString *username   = [userDefaults valueForKey:KEY_ADMIN_USERNAME]; 
NSString *password   = [userDefaults valueForKey:KEY_ADMIN_PASSWORD]; 
NSString *authStr   = [NSString stringWithFormat:@"%@:%@",strUserName,strAPIKey]; 
NSData *authData    = [authStr dataUsingEncoding:NSUTF8StringEncoding]; 
NSString *authValue   = [NSString stringWithFormat:@"Basic %@", [authData base64EncodedStringWithOptions:0]]; 
[request setValue:authValue forHTTPHeaderField:@"Authorization"];