# HG changeset patch
# User Sergey Kandaurov <pluknet@nginx.com>
# Date 1622451287 -10800
# Node ID f0882db8c8d445e294b976ea44f3419f46bafb35
# Parent  8422570f6af4d71bb35be3697a15a2f44f11f93d
HTTP/3: removed $http3 that served its purpose.

To specify final protocol version by hand:

    add_header Alt-Svc h3=":443";

diff --git a/README b/README
--- a/README
+++ b/README
@@ -135,17 +135,16 @@ 3. Configuration
         http3_push
         http3_push_preload
 
-    Two additional variables are available: $quic and $http3.
+    An additional variable is available: $quic.
     The value of $quic is "quic" if QUIC connection is used,
-    and empty string otherwise. The value of $http3 is a string
-    "h3-xx" where "xx" is the supported draft number.
+    or an empty string otherwise.
 
 Example configuration:
 
     http {
         log_format quic '$remote_addr - $remote_user [$time_local] '
                         '"$request" $status $body_bytes_sent '
-                        '"$http_referer" "$http_user_agent" "$quic" "$http3"';
+                        '"$http_referer" "$http_user_agent" "$quic"';
 
         access_log logs/access.log quic;
 
@@ -161,7 +160,7 @@ Example configuration:
 
             location / {
                 # required for browsers to direct them into quic port
-                add_header Alt-Svc '$http3=":8443"; ma=86400';
+                add_header Alt-Svc 'h3=":8443"; ma=86400';
             }
         }
     }
@@ -202,7 +201,7 @@ 4. Clients
    If you've got it right, in the access log you should see something like:
 
    127.0.0.1 - - [24/Apr/2020:11:27:29 +0300] "GET / HTTP/3" 200 805 "-"
-                                         "nghttp3/ngtcp2 client" "quic" "h3-29"
+                                         "nghttp3/ngtcp2 client" "quic"
 
 
 5. Troubleshooting
diff --git a/src/event/quic/ngx_event_quic.h b/src/event/quic/ngx_event_quic.h
--- a/src/event/quic/ngx_event_quic.h
+++ b/src/event/quic/ngx_event_quic.h
@@ -12,10 +12,6 @@
 #include <ngx_core.h>
 
 
-#ifndef NGX_QUIC_DRAFT_VERSION
-#define NGX_QUIC_DRAFT_VERSION               29
-#endif
-
 #define NGX_QUIC_MAX_UDP_PAYLOAD_SIZE        65527
 
 #define NGX_QUIC_DEFAULT_ACK_DELAY_EXPONENT  3
diff --git a/src/http/v3/ngx_http_v3_module.c b/src/http/v3/ngx_http_v3_module.c
--- a/src/http/v3/ngx_http_v3_module.c
+++ b/src/http/v3/ngx_http_v3_module.c
@@ -10,9 +10,6 @@
 #include <ngx_http.h>
 
 
-static ngx_int_t ngx_http_variable_http3(ngx_http_request_t *r,
-    ngx_http_variable_value_t *v, uintptr_t data);
-static ngx_int_t ngx_http_v3_add_variables(ngx_conf_t *cf);
 static void *ngx_http_v3_create_srv_conf(ngx_conf_t *cf);
 static char *ngx_http_v3_merge_srv_conf(ngx_conf_t *cf, void *parent,
     void *child);
@@ -64,7 +61,7 @@ static ngx_command_t  ngx_http_v3_comman
 
 
 static ngx_http_module_t  ngx_http_v3_module_ctx = {
-    ngx_http_v3_add_variables,             /* preconfiguration */
+    NULL,                                  /* preconfiguration */
     NULL,                                  /* postconfiguration */
 
     NULL,                                  /* create main configuration */
@@ -94,52 +91,6 @@ ngx_module_t  ngx_http_v3_module = {
 };
 
 
-static ngx_http_variable_t  ngx_http_v3_vars[] = {
-
-    { ngx_string("http3"), NULL, ngx_http_variable_http3, 0, 0, 0 },
-
-      ngx_http_null_variable
-};
-
-
-static ngx_int_t
-ngx_http_variable_http3(ngx_http_request_t *r,
-    ngx_http_variable_value_t *v, uintptr_t data)
-{
-    v->valid = 1;
-    v->no_cacheable = 1;
-    v->not_found = 0;
-
-    v->data = ngx_pnalloc(r->pool, sizeof("h3-xx") - 1);
-    if (v->data == NULL) {
-        return NGX_ERROR;
-    }
-
-    v->len = ngx_sprintf(v->data, "h3-%d", NGX_QUIC_DRAFT_VERSION) - v->data;
-
-    return NGX_OK;
-}
-
-
-static ngx_int_t
-ngx_http_v3_add_variables(ngx_conf_t *cf)
-{
-    ngx_http_variable_t  *var, *v;
-
-    for (v = ngx_http_v3_vars; v->name.len; v++) {
-        var = ngx_http_add_variable(cf, &v->name, v->flags);
-        if (var == NULL) {
-            return NGX_ERROR;
-        }
-
-        var->get_handler = v->get_handler;
-        var->data = v->data;
-    }
-
-    return NGX_OK;
-}
-
-
 static void *
 ngx_http_v3_create_srv_conf(ngx_conf_t *cf)
 {