在嵌入式 UIWebView 中指定 HTTP 引用

问题描述

在我的应用程序中，我允许用户在嵌入式 UIWebView 中打开外部页面.我可以设置与该请求一起发送的referer 标头吗?我希望我的应用在用户打开这些外部页面时获得信誉".

In my app, I allow the user to open up an external page in an embedded UIWebView. Is it possible for me to set the referer header that's sent with that request? I'd like for my app to get the 'cred' when the user opens up these external pages.

推荐答案

设置referer 使用 - setValue:forHTTPHeaderField:

NSMutableURLRequest* request = ...;
[request setValue:@"https://myapp.com" forHTTPHeaderField: @"Referer"];

但请注意，根据 HTTP RFC，您不应该这样做，因为您的应用无法使用 URI 进行寻址:

But note that according to the HTTP RFC you shouldn't, because your app is not addressable using a URI:

如果获取了 Request-URI，则不得发送 Referer 字段来自没有自己的 URI 的源，例如来自用户键盘.

The Referer field MUST NOT be sent if the Request-URI was obtained from a source that does not have its own URI, such as input from the user keyboard.

...除非您使用绑定到您的应用的自定义协议 (myapp://blah.com/blah).

... unless you are using a custom protocol binded to your app (myapp://blah.com/blah).

您可以创建一个并调用 loadRequest: 手动或拦截用户的正常请求.

You can create one and call loadRequest: manually or intercepting a normal request made by the user.

- (BOOL) webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType) navigationType 
{
    NSDictionary *headers = [request allHTTPHeaderFields];
    BOOL hasReferer = [headers objectForKey:@"Referer"]!=nil;
    if (hasReferer) {
        // .. is this my referer?
        return YES;
    } else {
        // relaunch with a modified request
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            dispatch_async(dispatch_get_main_queue(), ^{
                NSURL *url = [request URL];
                NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
                [request setHTTPMethod:@"GET"];
                [request setValue:@"https://whatever.com" forHTTPHeaderField: @"Referer"];
                [self.webView loadRequest:request];
            });
        });
        return NO;
    }
}

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