[PATCH 1 of 3] HTTP/3: "quic" parameter of "listen" directive

Sergey Kandaurov pluknet at nginx.com
Mon Feb 6 15:27:22 UTC 2023


> On 1 Feb 2023, at 18:01, Roman Arutyunyan <arut at nginx.com> wrote:
> 
> # HG changeset patch
> # User Roman Arutyunyan <arut at nginx.com>
> # Date 1675254688 -14400
> #      Wed Feb 01 16:31:28 2023 +0400
> # Branch quic
> # Node ID 2fcc1c60be1c89aad5464bcc06f1189d1adc885a
> # Parent  def8e398d7c50131f8dac844814fff729da5c86c
> HTTP/3: "quic" parameter of "listen" directive.
> 
> Now "listen" directve has a new "quic" parameter which enables QUIC protocol
> for the address.  Further, to enable HTTP/3, a new directive "http3" is
> introduced.  The hq-interop protocol is enabled by "http3_hq" as before.
> Now application protocol is chosen by ALPN.
> 
> Previously used "http3" parameter of "listen" is deprecated.

Looks good in general, minor comments below.

> 
> diff --git a/README b/README
> --- a/README
> +++ b/README
> @@ -93,13 +93,13 @@ 2. Installing
> 
> 3. Configuration
> 
> -    The HTTP "listen" directive got a new option "http3" which enables
> -    HTTP/3 over QUIC on the specified port.
> +    The HTTP "listen" directive got a new option "quic" which enables
> +    QUIC as client transport protocol instead of TCP.
> 
>     The Stream "listen" directive got a new option "quic" which enables
>     QUIC as client transport protocol instead of TCP or plain UDP.
> 
> -    Along with "http3" or "quic", it's also possible to specify "reuseport"
> +    Along with "quic", it's also possible to specify "reuseport"
>     option [8] to make it work properly with multiple workers.
> 
>     To enable address validation:
> @@ -133,12 +133,13 @@ 3. Configuration
> 
>     A number of directives were added that configure HTTP/3:
> 
> +        http3
> +        http3_hq
>         http3_stream_buffer_size
>         http3_max_concurrent_pushes
>         http3_max_concurrent_streams
>         http3_push
>         http3_push_preload
> -        http3_hq (requires NGX_HTTP_V3_HQ macro)
> 
>     In http, an additional variable is available: $http3.
>     The value of $http3 is "h3" for HTTP/3 connections,
> @@ -160,13 +161,15 @@ Example configuration:
>         server {
>             # for better compatibility it's recommended
>             # to use the same port for quic and https
> -            listen 8443 http3 reuseport;
> +            listen 8443 quic reuseport;
>             listen 8443 ssl;
> 
>             ssl_certificate     certs/example.com.crt;
>             ssl_certificate_key certs/example.com.key;
>             ssl_protocols       TLSv1.3;
> 
> +            http3 on;
> +
>             location / {
>                 # required for browsers to direct them into quic port
>                 add_header Alt-Svc 'h3=":8443"; ma=86400';
> diff --git a/src/http/modules/ngx_http_ssl_module.c b/src/http/modules/ngx_http_ssl_module.c
> --- a/src/http/modules/ngx_http_ssl_module.c
> +++ b/src/http/modules/ngx_http_ssl_module.c
> @@ -427,7 +427,7 @@ ngx_http_ssl_alpn_select(ngx_ssl_conn_t 
> #if (NGX_HTTP_V2 || NGX_HTTP_V3)
>     ngx_http_connection_t   *hc;
> #endif
> -#if (NGX_HTTP_V3 && NGX_HTTP_V3_HQ)
> +#if (NGX_HTTP_V3)
>     ngx_http_v3_srv_conf_t  *h3scf;
> #endif
> #if (NGX_HTTP_V2 || NGX_HTTP_V3 || NGX_DEBUG)
> @@ -455,19 +455,26 @@ ngx_http_ssl_alpn_select(ngx_ssl_conn_t 
>     } else
> #endif
> #if (NGX_HTTP_V3)
> -    if (hc->addr_conf->http3) {
> +    if (hc->addr_conf->quic) {
> 
> -#if (NGX_HTTP_V3_HQ)
>         h3scf = ngx_http_get_module_srv_conf(hc->conf_ctx, ngx_http_v3_module);
> 
> -        if (h3scf->hq) {
> +        if (h3scf->enable && h3scf->enable_hq) {
> +            srv = (unsigned char *) NGX_HTTP_V3_ALPN_PROTO
> +                                    NGX_HTTP_V3_HQ_ALPN_PROTO;
> +            srvlen = sizeof(NGX_HTTP_V3_ALPN_PROTO NGX_HTTP_V3_HQ_ALPN_PROTO)
> +                     - 1;
> +
> +        } else if (h3scf->enable_hq) {
>             srv = (unsigned char *) NGX_HTTP_V3_HQ_ALPN_PROTO;
>             srvlen = sizeof(NGX_HTTP_V3_HQ_ALPN_PROTO) - 1;
> -        } else
> -#endif
> -        {
> +
> +        } else if (h3scf->enable || hc->addr_conf->http3) {
>             srv = (unsigned char *) NGX_HTTP_V3_ALPN_PROTO;
>             srvlen = sizeof(NGX_HTTP_V3_ALPN_PROTO) - 1;
> +
> +        } else {
> +            return SSL_TLSEXT_ERR_ALERT_FATAL;
>         }
> 
>     } else
> @@ -1313,12 +1320,12 @@ ngx_http_ssl_init(ngx_conf_t *cf)
>         addr = port[p].addrs.elts;
>         for (a = 0; a < port[p].addrs.nelts; a++) {
> 
> -            if (!addr[a].opt.ssl && !addr[a].opt.http3) {
> +            if (!addr[a].opt.ssl && !addr[a].opt.quic) {
>                 continue;
>             }
> 
> -            if (addr[a].opt.http3) {
> -                name = "http3";
> +            if (addr[a].opt.quic) {
> +                name = "quic";
> 
>             } else {
>                 name = "ssl";
> @@ -1329,7 +1336,7 @@ ngx_http_ssl_init(ngx_conf_t *cf)
> 
>             if (sscf->certificates) {
> 
> -                if (addr[a].opt.http3 && !(sscf->protocols & NGX_SSL_TLSv1_3)) {
> +                if (addr[a].opt.quic && !(sscf->protocols & NGX_SSL_TLSv1_3)) {
>                     ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
>                                   "\"ssl_protocols\" must enable TLSv1.3 for "
>                                   "the \"listen ... %s\" directive in %s:%ui",
> diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
> --- a/src/http/ngx_http.c
> +++ b/src/http/ngx_http.c
> @@ -1242,6 +1242,7 @@ ngx_http_add_addresses(ngx_conf_t *cf, n
> #endif
> #if (NGX_HTTP_V3)
>     ngx_uint_t             http3;
> +    ngx_uint_t             quic;
> #endif
> 
>     /*
> @@ -1280,6 +1281,7 @@ ngx_http_add_addresses(ngx_conf_t *cf, n
> #endif
> #if (NGX_HTTP_V3)
>         http3 = lsopt->http3 || addr[i].opt.http3;
> +        quic = lsopt->quic || addr[i].opt.quic;
> #endif
> 
>         if (lsopt->set) {
> @@ -1319,6 +1321,7 @@ ngx_http_add_addresses(ngx_conf_t *cf, n
> #endif
> #if (NGX_HTTP_V3)
>         addr[i].opt.http3 = http3;
> +        addr[i].opt.quic = quic;
> #endif
> 
>         return NGX_OK;
> @@ -1823,7 +1826,7 @@ ngx_http_add_listening(ngx_conf_t *cf, n
> 
> #if (NGX_HTTP_V3)
> 
> -    ls->quic = addr->opt.http3;
> +    ls->quic = addr->opt.quic;
> 
>     if (ls->quic) {
>         ngx_rbtree_init(&ls->rbtree, &ls->sentinel,
> @@ -1866,6 +1869,7 @@ ngx_http_add_addrs(ngx_conf_t *cf, ngx_h
> #endif
> #if (NGX_HTTP_V3)
>         addrs[i].conf.http3 = addr[i].opt.http3;
> +        addrs[i].conf.quic = addr[i].opt.quic;
> #endif
>         addrs[i].conf.proxy_protocol = addr[i].opt.proxy_protocol;
> 
> @@ -1934,6 +1938,7 @@ ngx_http_add_addrs6(ngx_conf_t *cf, ngx_
> #endif
> #if (NGX_HTTP_V3)
>         addrs6[i].conf.http3 = addr[i].opt.http3;
> +        addrs6[i].conf.quic = addr[i].opt.quic;
> #endif
>         addrs6[i].conf.proxy_protocol = addr[i].opt.proxy_protocol;
> 
> diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
> --- a/src/http/ngx_http_core_module.c
> +++ b/src/http/ngx_http_core_module.c
> @@ -4191,6 +4191,11 @@ ngx_http_core_listen(ngx_conf_t *cf, ngx
> 
>         if (ngx_strcmp(value[n].data, "http3") == 0) {
> #if (NGX_HTTP_V3)
> +            ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
> +                               "the \"listen ... http3\" directive "
> +                               "is deprecated, use "
> +                               "the \"http3\" directive instead");
> +            lsopt.quic = 1;

It can be unclear that we need the "quic" parameter.

>             lsopt.http3 = 1;
>             lsopt.type = SOCK_DGRAM;
>             continue;
> @@ -4202,6 +4207,19 @@ ngx_http_core_listen(ngx_conf_t *cf, ngx
> #endif
>         }
> 
> +        if (ngx_strcmp(value[n].data, "quic") == 0) {
> +#if (NGX_HTTP_V3)
> +            lsopt.quic = 1;
> +            lsopt.type = SOCK_DGRAM;
> +            continue;
> +#else
> +            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
> +                               "the \"quic\" parameter requires "
> +                               "ngx_http_v3_module");
> +            return NGX_CONF_ERROR;
> +#endif
> +        }
> +
>         if (ngx_strncmp(value[n].data, "so_keepalive=", 13) == 0) {
> 
>             if (ngx_strcmp(&value[n].data[13], "on") == 0) {
> @@ -4304,8 +4322,8 @@ ngx_http_core_listen(ngx_conf_t *cf, ngx
>     }
> 
> #if (NGX_HTTP_SSL && NGX_HTTP_V3)
> -    if (lsopt.ssl && lsopt.http3) {
> -        return "\"ssl\" parameter is incompatible with \"http3\"";
> +    if (lsopt.ssl && lsopt.quic) {
> +        return "\"ssl\" parameter is incompatible with \"quic\"";
>     }
> #endif
> 
> diff --git a/src/http/ngx_http_core_module.h b/src/http/ngx_http_core_module.h
> --- a/src/http/ngx_http_core_module.h
> +++ b/src/http/ngx_http_core_module.h
> @@ -76,6 +76,7 @@ typedef struct {
>     unsigned                   ssl:1;
>     unsigned                   http2:1;
>     unsigned                   http3:1;
> +    unsigned                   quic:1;
> #if (NGX_HAVE_INET6)
>     unsigned                   ipv6only:1;
> #endif
> @@ -240,6 +241,7 @@ struct ngx_http_addr_conf_s {
>     unsigned                   ssl:1;
>     unsigned                   http2:1;
>     unsigned                   http3:1;
> +    unsigned                   quic:1;
>     unsigned                   proxy_protocol:1;
> };
> 
> diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
> --- a/src/http/ngx_http_request.c
> +++ b/src/http/ngx_http_request.c
> @@ -325,7 +325,7 @@ ngx_http_init_connection(ngx_connection_
> #endif
> 
> #if (NGX_HTTP_V3)
> -    if (hc->addr_conf->http3) {
> +    if (hc->addr_conf->quic) {
>         ngx_http_v3_init_stream(c);
>         return;
>     }
> diff --git a/src/http/v3/ngx_http_v3.c b/src/http/v3/ngx_http_v3.c
> --- a/src/http/v3/ngx_http_v3.c
> +++ b/src/http/v3/ngx_http_v3.c
> @@ -17,12 +17,9 @@ static void ngx_http_v3_cleanup_session(
> ngx_int_t
> ngx_http_v3_init_session(ngx_connection_t *c)
> {
> -    ngx_pool_cleanup_t      *cln;
> -    ngx_http_connection_t   *hc;
> -    ngx_http_v3_session_t   *h3c;
> -#if (NGX_HTTP_V3_HQ)
> -    ngx_http_v3_srv_conf_t  *h3scf;
> -#endif
> +    ngx_pool_cleanup_t     *cln;
> +    ngx_http_connection_t  *hc;
> +    ngx_http_v3_session_t  *h3c;
> 
>     hc = c->data;
> 
> @@ -36,13 +33,6 @@ ngx_http_v3_init_session(ngx_connection_
>     h3c->max_push_id = (uint64_t) -1;
>     h3c->goaway_push_id = (uint64_t) -1;
> 
> -#if (NGX_HTTP_V3_HQ)
> -    h3scf = ngx_http_get_module_srv_conf(hc->conf_ctx, ngx_http_v3_module);
> -    if (h3scf->hq) {
> -        h3c->hq = 1;
> -    }
> -#endif
> -
>     ngx_queue_init(&h3c->blocked);
>     ngx_queue_init(&h3c->pushing);
> 
> diff --git a/src/http/v3/ngx_http_v3.h b/src/http/v3/ngx_http_v3.h
> --- a/src/http/v3/ngx_http_v3.h
> +++ b/src/http/v3/ngx_http_v3.h
> @@ -21,6 +21,7 @@
> 
> #define NGX_HTTP_V3_ALPN_PROTO                     "\x02h3"
> #define NGX_HTTP_V3_HQ_ALPN_PROTO                  "\x0Ahq-interop"
> +#define NGX_HTTP_V3_HQ_PROTO                       "hq-interop"
> 
> #define NGX_HTTP_V3_VARLEN_INT_LEN                 4
> #define NGX_HTTP_V3_PREFIX_INT_LEN                 11
> @@ -101,13 +102,12 @@
> 
> 
> typedef struct {
> +    ngx_flag_t                    enable;
> +    ngx_flag_t                    enable_hq;
>     size_t                        max_table_capacity;
>     ngx_uint_t                    max_blocked_streams;
>     ngx_uint_t                    max_concurrent_pushes;
>     ngx_uint_t                    max_concurrent_streams;
> -#if (NGX_HTTP_V3_HQ)
> -    ngx_flag_t                    hq;
> -#endif
>     ngx_quic_conf_t               quic;
> } ngx_http_v3_srv_conf_t;
> 
> @@ -147,9 +147,7 @@ struct ngx_http_v3_session_s {
>     off_t                         payload_bytes;
> 
>     unsigned                      goaway:1;
> -#if (NGX_HTTP_V3_HQ)
>     unsigned                      hq:1;
> -#endif
> 
>     ngx_connection_t             *known_streams[NGX_HTTP_V3_MAX_KNOWN_STREAM];
> };
> 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
> @@ -32,6 +32,20 @@ static ngx_conf_post_t  ngx_http_quic_mt
> 
> static ngx_command_t  ngx_http_v3_commands[] = {
> 
> +    { ngx_string("http3"),
> +      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
> +      ngx_conf_set_flag_slot,
> +      NGX_HTTP_SRV_CONF_OFFSET,
> +      offsetof(ngx_http_v3_srv_conf_t, enable),
> +      NULL },
> +
> +    { ngx_string("http3_hq"),
> +      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
> +      ngx_conf_set_flag_slot,
> +      NGX_HTTP_SRV_CONF_OFFSET,
> +      offsetof(ngx_http_v3_srv_conf_t, enable_hq),
> +      NULL },
> +
>     { ngx_string("http3_max_concurrent_pushes"),
>       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
>       ngx_conf_set_num_slot,
> @@ -46,15 +60,6 @@ static ngx_command_t  ngx_http_v3_comman
>       offsetof(ngx_http_v3_srv_conf_t, max_concurrent_streams),
>       NULL },
> 
> -#if (NGX_HTTP_V3_HQ)
> -    { ngx_string("http3_hq"),
> -      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
> -      ngx_conf_set_flag_slot,
> -      NGX_HTTP_SRV_CONF_OFFSET,
> -      offsetof(ngx_http_v3_srv_conf_t, hq),
> -      NULL },
> -#endif
> -
>     { ngx_string("http3_push"),
>       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
>       ngx_http_v3_push,
> @@ -160,14 +165,12 @@ static ngx_int_t
> ngx_http_v3_variable(ngx_http_request_t *r,
>     ngx_http_variable_value_t *v, uintptr_t data)
> {
> -    if (r->connection->quic) {
> -#if (NGX_HTTP_V3_HQ)
> +    ngx_http_v3_session_t  *h3c;
> 
> -        ngx_http_v3_srv_conf_t  *h3scf;
> +    if (r->connection->quic) {
> +        h3c = ngx_http_v3_get_session(r->connection);
> 
> -        h3scf = ngx_http_get_module_srv_conf(r, ngx_http_v3_module);
> -
> -        if (h3scf->hq) {
> +        if (h3c->hq) {
>             v->len = sizeof("hq") - 1;
>             v->valid = 1;
>             v->no_cacheable = 0;
> @@ -177,8 +180,6 @@ ngx_http_v3_variable(ngx_http_request_t 
>             return NGX_OK;
>         }
> 
> -#endif
> -
>         v->len = sizeof("h3") - 1;
>         v->valid = 1;
>         v->no_cacheable = 0;
> @@ -232,12 +233,12 @@ ngx_http_v3_create_srv_conf(ngx_conf_t *
>      *     h3scf->quic.timeout = 0;
>      *     h3scf->max_blocked_streams = 0;
>      */
> +
> +    h3scf->enable = NGX_CONF_UNSET;
> +    h3scf->enable_hq = NGX_CONF_UNSET;
>     h3scf->max_table_capacity = NGX_HTTP_V3_MAX_TABLE_CAPACITY;
>     h3scf->max_concurrent_pushes = NGX_CONF_UNSET_UINT;
>     h3scf->max_concurrent_streams = NGX_CONF_UNSET_UINT;
> -#if (NGX_HTTP_V3_HQ)
> -    h3scf->hq = NGX_CONF_UNSET;
> -#endif
> 
>     h3scf->quic.mtu = NGX_CONF_UNSET_SIZE;
>     h3scf->quic.stream_buffer_size = NGX_CONF_UNSET_SIZE;
> @@ -264,6 +265,10 @@ ngx_http_v3_merge_srv_conf(ngx_conf_t *c
> 
>     ngx_http_ssl_srv_conf_t  *sscf;
> 
> +    ngx_conf_merge_value(conf->enable, prev->enable, 0);
> +
> +    ngx_conf_merge_value(conf->enable_hq, prev->enable_hq, 0);
> +
>     ngx_conf_merge_uint_value(conf->max_concurrent_pushes,
>                               prev->max_concurrent_pushes, 10);
> 
> @@ -272,11 +277,6 @@ ngx_http_v3_merge_srv_conf(ngx_conf_t *c
> 
>     conf->max_blocked_streams = conf->max_concurrent_streams;
> 
> -#if (NGX_HTTP_V3_HQ)
> -    ngx_conf_merge_value(conf->hq, prev->hq, 0);
> -#endif
> -
> -
>     ngx_conf_merge_size_value(conf->quic.mtu, prev->quic.mtu,
>                               NGX_QUIC_MAX_UDP_PAYLOAD_SIZE);
> 
> diff --git a/src/http/v3/ngx_http_v3_request.c b/src/http/v3/ngx_http_v3_request.c
> --- a/src/http/v3/ngx_http_v3_request.c
> +++ b/src/http/v3/ngx_http_v3_request.c
> @@ -110,7 +110,10 @@ ngx_http_v3_init_stream(ngx_connection_t
> ngx_int_t
> ngx_http_v3_init(ngx_connection_t *c)
> {
> +    unsigned int               len;
> +    const unsigned char       *data;
>     ngx_http_v3_session_t     *h3c;
> +    ngx_http_v3_srv_conf_t    *h3scf;
>     ngx_http_core_loc_conf_t  *clcf;
> 
>     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 init");
> @@ -119,11 +122,23 @@ ngx_http_v3_init(ngx_connection_t *c)
>     clcf = ngx_http_v3_get_module_loc_conf(c, ngx_http_core_module);
>     ngx_add_timer(&h3c->keepalive, clcf->keepalive_timeout);
> 
> -#if (NGX_HTTP_V3_HQ)
> -    if (h3c->hq) {
> -        return NGX_OK;
> +    h3scf = ngx_http_v3_get_module_srv_conf(c, ngx_http_v3_module);
> +
> +    if (h3scf->enable_hq) {
> +        if (!h3scf->enable) {
> +            h3c->hq = 1;
> +            return NGX_OK;
> +        }
> +
> +        SSL_get0_alpn_selected(c->ssl->connection, &data, &len);
> +
> +        if (len == sizeof(NGX_HTTP_V3_HQ_PROTO) - 1
> +            && ngx_strncmp(data, NGX_HTTP_V3_HQ_PROTO, len) == 0)
> +        {
> +            h3c->hq = 1;
> +            return NGX_OK;
> +        }
>     }
> -#endif
> 
>     return ngx_http_v3_send_settings(c);
> }
> @@ -147,10 +162,7 @@ ngx_http_v3_shutdown(ngx_connection_t *c
>     if (!h3c->goaway) {
>         h3c->goaway = 1;
> 
> -#if (NGX_HTTP_V3_HQ)
> -        if (!h3c->hq)
> -#endif
> -        {
> +        if (!h3c->hq) {
>             (void) ngx_http_v3_send_goaway(c, h3c->next_request_id);
>         }
> 
> @@ -205,10 +217,7 @@ ngx_http_v3_init_request_stream(ngx_conn
>     {
>         h3c->goaway = 1;
> 
> -#if (NGX_HTTP_V3_HQ)
> -        if (!h3c->hq)
> -#endif
> -        {
> +        if (!h3c->hq) {
>             if (ngx_http_v3_send_goaway(c, h3c->next_request_id) != NGX_OK) {
>                 ngx_http_close_connection(c);
>                 return;
> @@ -236,10 +245,7 @@ ngx_http_v3_init_request_stream(ngx_conn
> 
>     rev = c->read;
> 
> -#if (NGX_HTTP_V3_HQ)
> -    if (!h3c->hq)
> -#endif
> -    {
> +    if (!h3c->hq) {
>         rev->handler = ngx_http_v3_wait_request_handler;
>         c->write->handler = ngx_http_empty_handler;
>     }
> @@ -398,14 +404,14 @@ ngx_http_v3_wait_request_handler(ngx_eve
> void
> ngx_http_v3_reset_stream(ngx_connection_t *c)
> {
> +    ngx_http_v3_session_t   *h3c;
>     ngx_http_v3_srv_conf_t  *h3scf;
> 
>     h3scf = ngx_http_v3_get_module_srv_conf(c, ngx_http_v3_module);
> 
> -    if (h3scf->max_table_capacity > 0 && !c->read->eof
> -#if (NGX_HTTP_V3_HQ)
> -        && !h3scf->hq
> -#endif
> +    h3c = ngx_http_v3_get_session(c);
> +
> +    if (h3scf->max_table_capacity > 0 && !c->read->eof && !h3c->hq
>         && (c->quic->id & NGX_QUIC_STREAM_UNIDIRECTIONAL) == 0)
>     {
>         (void) ngx_http_v3_send_cancel_stream(c, c->quic->id);
> @@ -993,9 +999,11 @@ failed:
> static ngx_int_t
> ngx_http_v3_process_request_header(ngx_http_request_t *r)
> {
> -    ssize_t            n;
> -    ngx_buf_t         *b;
> -    ngx_connection_t  *c;
> +    ssize_t                  n;
> +    ngx_buf_t               *b;
> +    ngx_connection_t        *c;
> +    ngx_http_v3_session_t   *h3c;
> +    ngx_http_v3_srv_conf_t  *h3scf;
> 
>     c = r->connection;
> 
> @@ -1003,6 +1011,19 @@ ngx_http_v3_process_request_header(ngx_h
>         return NGX_ERROR;
>     }
> 
> +    h3c = ngx_http_v3_get_session(c);
> +    h3scf = ngx_http_get_module_srv_conf(r, ngx_http_v3_module);
> +
> +    if (!r->http_connection->addr_conf->http3) {
> +        if ((h3c->hq && !h3scf->enable_hq) || (!h3c->hq && !h3scf->enable)) {

can be reduced, hq is always false in the right part:

        if ((h3c->hq && !h3scf->enable_hq) || !h3scf->enable) {

> +            ngx_log_error(NGX_LOG_INFO, c->log, 0,
> +                          "client attempted to request the server name "
> +                          "for which the negotitated protocol is unavailable");

typo: negotiated

s/unavailable/disabled/ ?

> +            ngx_http_finalize_request(r, NGX_HTTP_MISDIRECTED_REQUEST);
> +            return NGX_ERROR;
> +        }
> +    }
> +
>     if (ngx_http_v3_construct_cookie_header(r) != NGX_OK) {
>         return NGX_ERROR;
>     }
> diff --git a/src/http/v3/ngx_http_v3_uni.c b/src/http/v3/ngx_http_v3_uni.c
> --- a/src/http/v3/ngx_http_v3_uni.c
> +++ b/src/http/v3/ngx_http_v3_uni.c
> @@ -37,12 +37,9 @@ void
> ngx_http_v3_init_uni_stream(ngx_connection_t *c)
> {
>     uint64_t                   n;
> -#if (NGX_HTTP_V3_HQ)
>     ngx_http_v3_session_t     *h3c;
> -#endif
>     ngx_http_v3_uni_stream_t  *us;
> 
> -#if (NGX_HTTP_V3_HQ)
>     h3c = ngx_http_v3_get_session(c);
>     if (h3c->hq) {
>         ngx_http_v3_finalize_connection(c,
> @@ -52,7 +49,6 @@ ngx_http_v3_init_uni_stream(ngx_connecti
>         ngx_http_v3_close_uni_stream(c);
>         return;
>     }
> -#endif
> 
>     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 init uni stream");
> 

-- 
Sergey Kandaurov


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