Configuration: added some missing proxy settings options.

There are some http related settings that are set internally but not
exposed to the config system.

Add

  - proxy_buffer_size
  - proxy_header_buffer_size
  - proxy_timeout
  - proxy_send_timeout
  - proxy_read_timeout

to the http configuration in nxt_router.c and the http configuration
validation in nxt_conf_validation.c

This doesn't add 'proxy_buffers' as that is unused and will be removed
in a follow up commit.

This then allows users to set these such as

   "settings": {
       "http": {
           "proxy_buffer_size": 65536,
           "proxy_header_buffer_size": 8192,
           "proxy_timeout": 30,
           "proxy_send_timeout": 60,
           "proxy_read_timeout": 60
       }
   }

If these values aren't set they retain their default values.

Author: ac000

src/nxt_conf_validation.c

@@ -320,6 +320,21 @@ static nxt_conf_vldt_object_t  nxt_conf_vldt_http_members[] = {
     }, {
         .name       = nxt_string("discard_unsafe_fields"),
         .type       = NXT_CONF_VLDT_BOOLEAN,
+    }, {
+        .name       = nxt_string("proxy_buffer_size"),
+        .type       = NXT_CONF_VLDT_INTEGER,
+    }, {
+        .name       = nxt_string("proxy_header_buffer_size"),
+        .type       = NXT_CONF_VLDT_INTEGER,
+    }, {
+        .name       = nxt_string("proxy_timeout"),
+        .type       = NXT_CONF_VLDT_INTEGER,
+    }, {
+        .name       = nxt_string("proxy_send_timeout"),
+        .type       = NXT_CONF_VLDT_INTEGER,
+    }, {
+        .name       = nxt_string("proxy_read_timeout"),
+        .type       = NXT_CONF_VLDT_INTEGER,
     }, {
         .name       = nxt_string("websocket"),
         .type       = NXT_CONF_VLDT_OBJECT,

src/nxt_router.c

@@ -1449,6 +1449,36 @@ static nxt_conf_map_t  nxt_router_http_conf[] = {
         NXT_CONF_MAP_INT8,
         offsetof(nxt_socket_conf_t, discard_unsafe_fields),
     },
+
+    {
+        nxt_string("proxy_buffer_size"),
+        NXT_CONF_MAP_SIZE,
+        offsetof(nxt_socket_conf_t, proxy_buffer_size),
+    },
+
+    {
+        nxt_string("proxy_header_buffer_size"),
+        NXT_CONF_MAP_SIZE,
+        offsetof(nxt_socket_conf_t, proxy_header_buffer_size),
+    },
+
+    {
+        nxt_string("proxy_timeout"),
+        NXT_CONF_MAP_MSEC,
+        offsetof(nxt_socket_conf_t, proxy_timeout),
+    },
+
+    {
+        nxt_string("proxy_send_timeout"),
+        NXT_CONF_MAP_MSEC,
+        offsetof(nxt_socket_conf_t, proxy_send_timeout),
+    },
+
+    {
+        nxt_string("proxy_read_timeout"),
+        NXT_CONF_MAP_MSEC,
+        offsetof(nxt_socket_conf_t, proxy_read_timeout),
+    },
 };