Httpd with api gateway [AWS] : Error reading from remote server - apache

Question

In my use case i have to make an api gateway accessible by a reverse proxy.
something like this :
(users -> Httpd(EC2) -> api gateway -> lambda)
I was able to create a vpc-link between my api gateway and my virtual machine EC2( it's working perfectly).
but the second part is to create a server httpd which will redirecte the requests from other networks to my api gateway.
but my httpd server seems not working
here the error
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /myapi/.
Reason: Error reading from remote server
here my httpd configuration
<VirtualHost *:443>
# Use HTTP Strict Transport Security to force client to use secure connections only
Header always set Strict-Transport-Security "max-age=300; includeSubDomains; preload"
ServerAdmin administrator#test.net
ServerName www.test.net
ServerAlias test.net
DocumentRoot /var/www/html/test.net/public_html/
SSLEngine on
SSLCertificateFile /etc/httpd/selfsigned/server.crt
SSLCertificateKeyFile /etc/httpd/selfsigned/server.key
SSLProxyEngine On
ProxyPass /myapi/ https://apigateway.amazonaws.com/ retry=1 acquire=3000 timeout=24000 Keepalive=On
ProxyPassReverse /myapi/ https://apigateway.amazonaws.com/
ProxyPreserveHost On
</VirtualHost>
NB: the lambda function return a simple response.
do you have an idea ?
thank you in advance