最近在做push 信息到facebook中。当使用UIWebview加载https的站点时webview总是会报NSURLErrorDomain code=-1202，导致网页加载失败。自己打印错误和网上搜索是因为证书失效，https使用超文本安全传输协议，即超文本传输协议（HTTP）和SSL/TLS的组合，用以提供加密通讯及对网络服务器身份的鉴定。当我们的服务器使用自我签名证书时，而UIWebView不允许使用自签名证书，所以导致加载失败。我们可以使用NSURLConnection通过它的代理canAuthenticateAgainstProtectionSpace可以允许这种情况,从而通过它进行认证。
#import <UIKit/UIKit.h>
#import "MyObject.h"
@interface ViewController :UIViewController<UIWebViewDelegate,NSURLConnectionDelegate>
{
UIWebView *_web;
NSURLConnection *_urlConnection;
NSURLRequest *_request;
BOOL _authenticated;
}
@end
@interfaceViewController ()
@end
@implementation ViewController
@synthesize myobject;
- (void)viewDidLoad
{
[superviewDidLoad];
_web = [[UIWebViewalloc] initWithFrame:CGRectMake(0,0,768,1024)];
_web.delegate =self;
_web.autoresizingMask =UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
[self.viewaddSubview:_web];
NSURL* _loadingURL =[NSURLURLWithString:@"https://m.facebook.com/dialog/feed?link=http%3A%2F%2Fwww.facebook.com%2FeNGage.OnePub&description=Werwr4w532545245&access_token=BAAC117qbwhQBAFtqiZAmWH8hOtkJLOcC0OTgmYJxX5IybPlPp2ozoZBewaJXBtOagJ5bJItZCZBJ8o8Sal0c52Tt4h2XbPf2f5osEo1ZB2lQh0hF969zeOpoPu1BsS5Hgtr00U55gYb7ZABsvcFohG&caption=Page%201&name=eNGage&picture=http%3A%2F%2Fc1345842.cdn.cloudfiles.rackspacecloud.com%2Fassets%2Fapps%2Ficons%2F001%2F002%2F707%2Foriginal.png%3F1324531970&actions=%5B%7B%22name%22%3A%22Find%20out%20more%20about%20eNGage%22%2C%22link%22%3A%22http%3A%2F%2Fwww.facebook.com%2FeNGage.OnePub%22%7D%5D&app_id=199938153366036&redirect_uri=fbconnect%3A%2F%2Fsuccess&sdk=2&display=touch"];
//_loadingURL=[NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[_loadingURL host]];
_request = [NSMutableURLRequestrequestWithURL:_loadingURL];
[_webloadRequest:_request];
// Do any additional setup after loading the view, typically from a nib.
// UIImageView *uimage=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image27.png"]];
// [self.view addSubview:uimage];
// MyObject *object=[[MyObject alloc]init];
// MyObject *object1=[object retain];
//self.myobject=object;
//myobject = object;
//NSLog(@"******retainCount:%d",[myobject retainCount]);
//NSLog(@"******self.retainCount:%d",[self.myobject retainCount]);
//[object release];
}
- (void)didReceiveMemoryWarning
{
[superdidReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Webview delegate
// Note: This method is particularly important. As the server is using a self signed certificate,
// we cannot use just UIWebView - as it doesn't allow for using self-certs. Instead, we stop the
// request in this method below, create an NSURLConnection (which can allow self-certs via the delegate methods
// which UIWebView does not have), authenticate using NSURLConnection, then use another UIWebView to complete
// the loading and viewing of the page. See connection:didReceiveAuthenticationChallenge to see how this works.
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;
{
NSLog(@"Did start loading: %@ auth:%d", [[requestURL]absoluteString],_authenticated);
if (!_authenticated) {
_authenticated =NO;
_urlConnection = [[NSURLConnectionalloc] initWithRequest:_requestdelegate:self];
[_urlConnectionstart];
returnNO;
}
returnYES;
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
// 102 == WebKitErrorFrameLoadInterruptedByPolicyChange
NSLog(@"***********error:%@,errorcode=%d,errormessage:%@",error.domain,error.code,error.description);
if (!([error.domainisEqualToString:@"WebKitErrorDomain"] && error.code ==102)) {
//[self dismissWithError:error animated:YES];
}
}
#pragma mark - NURLConnection delegate
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;
{
NSLog(@"WebController Got auth challange via NSURLConnection");
if ([challengepreviousFailureCount] ==0)
{
_authenticated =YES;
NSURLCredential *credential = [NSURLCredentialcredentialForTrust:challenge.protectionSpace.serverTrust];
[challenge.senderuseCredential:credentialforAuthenticationChallenge:challenge];
} else
{
[[challenge sender]cancelAuthenticationChallenge:challenge];
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
{
NSLog(@"WebController received response via NSURLConnection");
// remake a webview call now that authentication has passed ok.
_authenticated =YES;
[_webloadRequest:_request];
// Cancel the URL connection otherwise we double up (webview + url connection, same url = no good!)
[_urlConnectioncancel];
}
// We use this method is to accept an untrusted site which unfortunately we need to do, as our PVM servers are self signed.
- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace
{
return[protectionSpace.authenticationMethodisEqualToString:NSURLAuthenticationMethodServerTrust];
}
@end
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