Thanks very much, good to know, will stick with prefork.

> On 11 Jan 2022, at 14:45, Michael Kondratov <mich...@aspireauctions.com> 
> wrote:
> 
> You need to use prefork Apache. Processes instead  threads. The WO adapter 
> will not work in a multithreaded setup.
> 
> Disable http2.
> 
> Michael 
> 
> Sent from my iPhone
> 
>> On Jan 11, 2022, at 4:21 AM, John Pollard via Webobjects-dev 
>> <webobjects-dev@lists.apple.com> wrote:
>> 
>> Hello list,
>> 
>> I recently moved to Amazon Linux 2 and apache 2.4
>> 
>> In /etc/httpd/conf.modules.d/00-mpm.conf
>> 
>> If I opt for prefork, I see this in the error log:
>> 
>> The mpm module (prefork.c) is not supported by mod_http2. The mpm determines 
>> how things are processed in your server. HTTP/2 has more demands in this 
>> regard and the currently selected mpm will just not do. This is an advisory 
>> warning. Your server will continue to work, but the HTTP/2 protocol will be 
>> inactive.
>> 
>> If I instead opt for the event module
>> 
>> I intermittently get segmentation faults logged, such as:
>> [Tue Jan 11 07:35:36.570934 2022] [core:notice] [pid 2485:tid 
>> 139715274359360] AH00052: child pid 3132 exit signal Segmentation fault (11)
>> 
>> Should I be able to use mpm event and how important is having support for 
>> http/2? I believe I have the correct mod_WebObjects.so for apache 2.4, works 
>> fine with prefork
>> 
>> Many thanks,
>> John
>> 
>> 
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