使用 UIWebView loadRequest 发送自定义标头

问题描述

我希望能够使用我的 UIWebView loadRequest 方法发送一些额外的标头.

I want to be able to send some extra headers with my UIWebView loadRequest method.

我试过了:

NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.reliply.org/tools/requestheaders.php"]];
[req addValue:@"hello" forHTTPHeaderField:@"aHeader"];

[self.theWebView loadRequest:req];

我也尝试过继承 UIWebView 并拦截 - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType 方法.

I have also tried subclassing the UIWebView and intercepting the - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType method.

在那个方法中，我有一个如下所示的代码块:

In that method I had a block of code which looked like this:

NSMutableURLRequest *newRequest = [request mutableCopy];
for(NSString *key in [customHeaders allKeys]) {
    [newRequest setValue:[customHeaders valueForKey:key] forHTTPHeaderField:key];
}
[self loadRequest:newRequest];

但由于某种未知原因，它导致 Web 视图无法加载任何内容(空白框)并且出现错误消息 NSURLErrorCancelled (-999)(所有已知的修复程序都无法修复它我).

But for some unknown reason it was causing the web view to not load anything (blank frame) and the error message NSURLErrorCancelled (-999) comes up (all known fixes don't fix it for me).

所以我不知道该怎么办.如何将自定义标头与 UIWebView 请求一起发送?

So I am at a loss as to what to do. How can I send a custom header along with a UIWebView request?

非常感谢！

推荐答案

我发现这是在我的 UIWebView 请求中添加标头的方法 - 覆盖此委托方法:

I found that this was the way to add headers to my UIWebView request - override this delegate method:

- (BOOL) webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType) navigationType

使用此代码:

BOOL headerIsPresent = [[request allHTTPHeaderFields] objectForKey:@"my custom header"]!=nil;

if(headerIsPresent) return YES;

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];

        // set the new headers
        for(NSString *key in [self.customHeaders allKeys]){
            [request addValue:[self.customHeaders objectForKey:key] forHTTPHeaderField:key];
        }

        // reload the request
        [self loadRequest:request];
    });
});
return NO;

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