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/modules
+++ b/auto/modules
@@ -744,6 +744,17 @@ if [ $HTTP = YES ]; then
         . auto/module
     fi
 
+    if [ $HTTP_GRPC = YES -a $HTTP_V2 = YES ]; then
+        ngx_module_name=ngx_http_grpc_module
+        ngx_module_incs=
+        ngx_module_deps=
+        ngx_module_srcs=src/http/modules/ngx_http_grpc_module.c
+        ngx_module_libs=
+        ngx_module_link=$HTTP_GRPC
+
+        . auto/module
+    fi
+
     if [ $HTTP_PERL != NO ]; then
         ngx_module_name=ngx_http_perl_module
         ngx_module_incs=src/http/modules/perl