What will the URL loading system do when I call "URLProtocol: didLoadData:" in the user protocol URL?

Question

I am using a custom NSURLProtocol to do something before WebView gets a response, everything goes fine except for this url https://dou.bz/23o8PS .

If I stop using NSURLProtocol, just let the WebView load the request (init from the URL), it works fine. But if the data was loaded from the protocol, WebView does not seem to treat it as an HTML file:

what will go wrong?

Answer 1

I check the header and find:

 Content-Type: text/plain 

possibly other links:

 Content-Type: text/html