I have Apache 2.4 setup on my server serving webpages with the HTTP 1.1 protocol. The system is currently not ready to handle HTTP2 (please dont ask why).
When reviewing server logs, I saw a few of these requests in my access_log
PRI * HTTP/2.0 400 18 - -So I want to prevent my server from being worn down with such requests from google.I look here on google: https://developers.google.com/search/docs/crawling-indexing/googlebot and it states I should issue HTTP error code 421 to solve my problem. My server produces error code 400, not 421.
Rather than try to figure out how to make an apache module, is there some setting I can use in httpd.conf or some premade module I can use to make all HTTP2 requests issue error 421 so my logs don't get excessively hammered?