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WKWebView set custom HTTP headers

To set HTTP headers before the webview navigate to a new page, just cancel the existing request and load a new request:

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    NSString *headerField = @"Authorization";
    NSString *headerValue = [NSString stringWithFormat:@"Bearer %@", accessToken];

    if([[navigationAction.request valueForHTTPHeaderField:headerField] isEqualToString:headerValue]) {
        decisionHandler(WKNavigationActionPolicyAllow);
    } else {
        NSMutableURLRequest *newRequest = [[NSMutableURLRequest alloc] initWithURL:navigationAction.request.URL];
        [newRequest setValue:headerValue forHTTPHeaderField:headerField];

        decisionHandler(WKNavigationActionPolicyCancel);
        [self.webView loadRequest:newRequest];
    }
}

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Problem

This method is not working for POST request, as navigationAction.request.HTTPBody is always nil

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Solution

  1. Use Javascript to send POST request with custom HTTP headers

  2. Call Javascript function from Native call - (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^ _Nullable)(_Nullable id, NSError * _Nullable error))completionHandler;

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References

PreviousRetrieve expiry date of Provisioning Profile Certificate from .ipaNextIAP applicationUsername is nil

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