When I try to get only the response headers of telegram domain, it returns 501 Not Implemented error status code which contradicts the RFC 7231 Section 4.1 which clearly stipulates that "ALL general web servers MUST support methods GET and HEAD, other methods are OPTIONAL"
Steps to reproduce
1.Go to terminal/command prompt/console window
2. Input the following command: curl -vI https://telegram.org
3.The Telegram server returns 501 Not Implemented error status code (normally it must return a 200 successful response code with headers only)
but there is no security issue imposed by getting only the response headers Famous domains Such as Google and Microsoft all return 200 for head requests
D
Deleted Account
there is nothing special for Telegram domain. Unless it is not a 'general web server'
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Famous domains Such as Google and Microsoft all return 200 for head requests