The gRPC proxy module. The module allows passing requests to upstream gRPC servers. The module is built by default as long as HTTP/2 support is compiled in. Example configuration: grpc_pass 127.0.0.1:9000; Alternatively, the "grpc://" scheme can be used: grpc_pass grpc://127.0.0.1:9000; Keepalive support is available via the upstream keepalive module. Note that keepalive connections won't currently work with grpc-go as it fails to handle SETTINGS_HEADER_TABLE_SIZE. To use with SSL: grpc_pass grpcs://127.0.0.1:9000; SSL connections use ALPN "h2" when available. At least grpc-go works fine without ALPN, so if ALPN is not available we just establish a connection without it. Tested with grpc-c++ and grpc-go.

--- a/auto/options
+++ b/auto/options
@@ -86,6 +86,7 @@ HTTP_PROXY=YES
 HTTP_FASTCGI=YES
 HTTP_UWSGI=YES
 HTTP_SCGI=YES
+HTTP_GRPC=YES
 HTTP_PERL=NO
 HTTP_MEMCACHED=YES
 HTTP_LIMIT_CONN=YES
@@ -262,6 +263,7 @@ do
         --without-http_fastcgi_module)   HTTP_FASTCGI=NO            ;;
         --without-http_uwsgi_module)     HTTP_UWSGI=NO              ;;
         --without-http_scgi_module)      HTTP_SCGI=NO               ;;
+        --without-http_grpc_module)      HTTP_GRPC=NO               ;;
         --without-http_memcached_module) HTTP_MEMCACHED=NO          ;;
         --without-http_limit_conn_module) HTTP_LIMIT_CONN=NO        ;;
         --without-http_limit_req_module) HTTP_LIMIT_REQ=NO         ;;