In my case, I need to add some custom headers for some special requests. so I add following code in UIWebViewDelegate:
- (BOOL)webView:(UIWebView *)webView
shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType
{
NSString *host = [[request URL] host];
static NSString *testTag = @"test_tag";
if ([host hasSuffix:@"yixin.im"]) // add special tag for special url(base on host)
{
if ([[request allHTTPHeaderFields] objectForKey:testTag] == nil)
{
NSMutableURLRequest *aRequest = [request mutableCopy];
[aRequest addValue:@"1" forHTTPHeaderField:testTag];
[webView loadRequest:aRequest];
return NO;
}
}
else //remove special tag for other url
{
if ([[request allHTTPHeaderFields] objectForKey:testTag])
{
NSMutableURLRequest *aRequest = [request mutableCopy];
[aRequest addValue:nil forHTTPHeaderField:testTag];
[webView loadRequest:aRequest];
return NO;
}
}
return YES;
}
However, it crashed while loading the same url second times. The crash stack is quite strange:
I found that the crash is related to UIWebView cache. After removing ApplicationCache.db in Cache directory, it won't crash. However, I couldn't find the way to fix this crash.
My demo project is showed following: crash project. Follow the next two step, you will see the crash.
- launch the app,you will see a webpage.
- then relaunch the app,it crashes.
Some methods I have tried:
1.replace addValue:forHTTPHeaderField: by setValue:forHTTPHeaderField, it didn't work.
2.reset http headers by calling setAllHTTPHeaderFields:,it didn't work too.
3.replace nil by @"",it didn't work to.
4.replace return NO by return YES,it works...However,it doesn't make sense....
