add configuration for http2_max_concurrent_streams

docs/user-guide/nginx-configuration/configmap.md

@@ -51,6 +51,7 @@ The following table shows a configuration option's name, type, and the default v
 |[http2-max-field-size](#http2-max-field-size)|string|"4k"|
 |[http2-max-header-size](#http2-max-header-size)|string|"16k"|
 |[http2-max-requests](#http2-max-requests)|int|1000|
+|[http2-max-concurrent-streams](#http2-max-concurrent-streams)|int|1000|
 |[hsts](#hsts)|bool|"true"|
 |[hsts-include-subdomains](#hsts-include-subdomains)|bool|"true"|
 |[hsts-max-age](#hsts-max-age)|string|"15724800"|
@@ -310,6 +311,13 @@ Sets the maximum number of requests (including push requests) that can be served
 _References:_
 [http://nginx.org/en/docs/http/ngx_http_v2_module.html#http2_max_requests](http://nginx.org/en/docs/http/ngx_http_v2_module.html#http2_max_requests)
 
+## http2-max-concurrent-streams
+
+Sets the maximum number of concurrent HTTP/2 streams in a connection.
+
+_References:_
+[http://nginx.org/en/docs/http/ngx_http_v2_module.html#http2_max_concurrent_streams](http://nginx.org/en/docs/http/ngx_http_v2_module.html#http2_max_concurrent_streams)
+
 ## hsts
 
 Enables or disables the header HSTS in servers running SSL.

internal/ingress/controller/config/config.go

@@ -196,6 +196,10 @@ type Configuration struct {
 	// and the need of establishing a new connection.
 	HTTP2MaxRequests int `json:"http2-max-requests,omitempty"`
 
+	// http://nginx.org/en/docs/http/ngx_http_v2_module.html#http2_max_concurrent_streams
+	// Sets the maximum number of concurrent HTTP/2 streams in a connection.
+	HTTP2MaxConcurrentStreams int `json:"http2-max-concurrent-streams,omitempty"`
+
 	// Enables or disables the header HSTS in servers running SSL
 	HSTS bool `json:"hsts,omitempty"`
 
@@ -676,6 +680,7 @@ func NewDefault() Configuration {
 		HTTP2MaxFieldSize:                "4k",
 		HTTP2MaxHeaderSize:               "16k",
 		HTTP2MaxRequests:                 1000,
+		HTTP2MaxConcurrentStreams:        128,
 		HTTPRedirectCode:                 308,
 		HSTS:                             true,
 		HSTSIncludeSubdomains:            true,

rootfs/etc/nginx/template/nginx.tmpl

@@ -210,6 +210,7 @@ http {
     http2_max_field_size            {{ $cfg.HTTP2MaxFieldSize }};
     http2_max_header_size           {{ $cfg.HTTP2MaxHeaderSize }};
     http2_max_requests              {{ $cfg.HTTP2MaxRequests }};
+    http2_max_concurrent_streams    {{ $cfg.HTTP2MaxConcurrentStreams }};
 
     types_hash_max_size             2048;
     server_names_hash_max_size      {{ $cfg.ServerNameHashMaxSize }};