Apache mod_fastcgi & HTTP/2 Inconsistencies

[mampsupportmod]

We were receiving below across our sites after enabling

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http2_module

in Apache config:

411 Error:

Length Required
A request of the requested method GET requires a valid Content-length.
Apache/2.4.66 (Unix) OpenSSL/1.1.Iw mod_wsgil5.0.2 Python/3.14 mod_fastci/mod_fastgi-

After investigation we found

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mod_fastcgi

incompatibility with HTTP/2 and produces random 411 errors on browsing. However, current version of MAMP Pro requires FastCGI remain enabled per config:

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# modules that SHOULD be always ON
LoadModule fastcgi_module modules/mod_fastcgi.so

mod_fastcgi is now considered legacy. MAMP needs to move to new version which is

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http2_module

+

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proxy_fcgi_module

and so to allow disabling of fastcgi.


Short term solution is to disable http2_module in Apache config when using fastcgi.