--- a/src/http/v3/ngx_http_v3_module.c
+++ b/src/http/v3/ngx_http_v3_module.c
@@ -10,15 +10,34 @@
 #include <ngx_http.h>
 
 
+static ngx_int_t ngx_http_v3_variable_quic(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);
+static char *ngx_http_quic_max_ack_delay(ngx_conf_t *cf, void *post,
+    void *data);
+static char *ngx_http_quic_max_udp_payload_size(ngx_conf_t *cf, void *post,
+    void *data);
+static char *ngx_http_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
 static void *ngx_http_v3_create_loc_conf(ngx_conf_t *cf);
 static char *ngx_http_v3_merge_loc_conf(ngx_conf_t *cf, void *parent,
     void *child);
 static char *ngx_http_v3_push(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
 
 
+static ngx_conf_post_t  ngx_http_quic_max_ack_delay_post =
+    { ngx_http_quic_max_ack_delay };
+static ngx_conf_post_t  ngx_http_quic_max_udp_payload_size_post =
+    { ngx_http_quic_max_udp_payload_size };
+static ngx_conf_num_bounds_t  ngx_http_quic_ack_delay_exponent_bounds =
+    { ngx_conf_check_num_bounds, 0, 20 };
+static ngx_conf_num_bounds_t  ngx_http_quic_active_connection_id_limit_bounds =
+    { ngx_conf_check_num_bounds, 2, -1 };
+
+
 static ngx_command_t  ngx_http_v3_commands[] = {
 
     { ngx_string("http3_max_table_capacity"),
@@ -63,12 +82,119 @@ static ngx_command_t  ngx_http_v3_comman
       offsetof(ngx_http_v3_loc_conf_t, push_preload),
       NULL },
 
+    { ngx_string("quic_max_idle_timeout"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_msec_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.max_idle_timeout),
+      NULL },
+
+    { ngx_string("quic_max_ack_delay"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_msec_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.max_ack_delay),
+      &ngx_http_quic_max_ack_delay_post },
+
+    { ngx_string("quic_max_udp_payload_size"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.max_udp_payload_size),
+      &ngx_http_quic_max_udp_payload_size_post },
+
+    { ngx_string("quic_initial_max_data"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.initial_max_data),
+      NULL },
+
+    { ngx_string("quic_initial_max_stream_data_bidi_local"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t,
+               quic.tp.initial_max_stream_data_bidi_local),
+      NULL },
+
+    { ngx_string("quic_initial_max_stream_data_bidi_remote"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t,
+               quic.tp.initial_max_stream_data_bidi_remote),
+      NULL },
+
+    { ngx_string("quic_initial_max_stream_data_uni"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.initial_max_stream_data_uni),
+      NULL },
+
+    { ngx_string("quic_initial_max_streams_bidi"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.initial_max_streams_bidi),
+      NULL },
+
+    { ngx_string("quic_initial_max_streams_uni"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.initial_max_streams_uni),
+      NULL },
+
+    { ngx_string("quic_ack_delay_exponent"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.ack_delay_exponent),
+      &ngx_http_quic_ack_delay_exponent_bounds },
+
+    { ngx_string("quic_disable_active_migration"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_flag_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.disable_active_migration),
+      NULL },
+
+    { ngx_string("quic_active_connection_id_limit"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.tp.active_connection_id_limit),
+      &ngx_http_quic_active_connection_id_limit_bounds },
+
+    { ngx_string("quic_retry"),
+      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, quic.retry),
+      NULL },
+
+    { ngx_string("quic_gso"),
+      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, quic.gso_enabled),
+      NULL },
+
+    { ngx_string("quic_host_key"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_http_quic_host_key,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      0,
+      NULL },
+
       ngx_null_command
 };
 
 
 static ngx_http_module_t  ngx_http_v3_module_ctx = {
-    NULL,                                  /* preconfiguration */
+    ngx_http_v3_add_variables,             /* preconfiguration */
     NULL,                                  /* postconfiguration */
 
     NULL,                                  /* create main configuration */
@@ -98,6 +224,55 @@ ngx_module_t  ngx_http_v3_module = {
 };
 
 
+static ngx_http_variable_t  ngx_http_v3_vars[] = {
+
+    { ngx_string("quic"), NULL, ngx_http_v3_variable_quic, 0, 0, 0 },
+
+      ngx_http_null_variable
+};
+
+static ngx_str_t  ngx_http_quic_salt = ngx_string("ngx_quic");
+
+
+static ngx_int_t
+ngx_http_v3_variable_quic(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    if (r->connection->quic) {
+
+        v->len = 4;
+        v->valid = 1;
+        v->no_cacheable = 1;
+        v->not_found = 0;
+        v->data = (u_char *) "quic";
+        return NGX_OK;
+    }
+
+    v->not_found = 1;
+
+    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)
 {
@@ -108,11 +283,42 @@ ngx_http_v3_create_srv_conf(ngx_conf_t *
         return NULL;
     }
 
+    /*
+     * set by ngx_pcalloc():
+     *
+     *     h3scf->quic.tp.original_dcid = { 0, NULL };
+     *     h3scf->quic.tp.initial_scid = { 0, NULL };
+     *     h3scf->quic.tp.retry_scid = { 0, NULL };
+     *     h3scf->quic.tp.sr_token = { 0 }
+     *     h3scf->quic.tp.sr_enabled = 0
+     *     h3scf->quic.tp.preferred_address = NULL
+     *     h3scf->quic.host_key = { 0, NULL }
+     *     h3scf->quic.stream_reject_code_uni = 0;
+     */
+
     h3scf->max_table_capacity = NGX_CONF_UNSET_SIZE;
     h3scf->max_blocked_streams = NGX_CONF_UNSET_UINT;
     h3scf->max_concurrent_pushes = NGX_CONF_UNSET_UINT;
     h3scf->max_uni_streams = NGX_CONF_UNSET_UINT;
 
+    h3scf->quic.tp.max_idle_timeout = NGX_CONF_UNSET_MSEC;
+    h3scf->quic.tp.max_ack_delay = NGX_CONF_UNSET_MSEC;
+    h3scf->quic.tp.max_udp_payload_size = NGX_CONF_UNSET_SIZE;
+    h3scf->quic.tp.initial_max_data = NGX_CONF_UNSET_SIZE;
+    h3scf->quic.tp.initial_max_stream_data_bidi_local = NGX_CONF_UNSET_SIZE;
+    h3scf->quic.tp.initial_max_stream_data_bidi_remote = NGX_CONF_UNSET_SIZE;
+    h3scf->quic.tp.initial_max_stream_data_uni = NGX_CONF_UNSET_SIZE;
+    h3scf->quic.tp.initial_max_streams_bidi = NGX_CONF_UNSET_UINT;
+    h3scf->quic.tp.initial_max_streams_uni = NGX_CONF_UNSET_UINT;
+    h3scf->quic.tp.ack_delay_exponent = NGX_CONF_UNSET_UINT;
+    h3scf->quic.tp.disable_active_migration = NGX_CONF_UNSET;
+    h3scf->quic.tp.active_connection_id_limit = NGX_CONF_UNSET_UINT;
+
+    h3scf->quic.retry = NGX_CONF_UNSET;
+    h3scf->quic.gso_enabled = NGX_CONF_UNSET;
+    h3scf->quic.stream_close_code = NGX_HTTP_V3_ERR_NO_ERROR;
+    h3scf->quic.stream_reject_code_bidi = NGX_HTTP_V3_ERR_REQUEST_REJECTED;
+
     return h3scf;
 }
 
@@ -123,6 +329,8 @@ ngx_http_v3_merge_srv_conf(ngx_conf_t *c
     ngx_http_v3_srv_conf_t *prev = parent;
     ngx_http_v3_srv_conf_t *conf = child;
 
+    ngx_http_ssl_srv_conf_t  *sscf;
+
     ngx_conf_merge_size_value(conf->max_table_capacity,
                               prev->max_table_capacity, 16384);
 
@@ -135,10 +343,231 @@ ngx_http_v3_merge_srv_conf(ngx_conf_t *c
     ngx_conf_merge_uint_value(conf->max_uni_streams,
                               prev->max_uni_streams, 3);
 
+    ngx_conf_merge_msec_value(conf->quic.tp.max_idle_timeout,
+                              prev->quic.tp.max_idle_timeout, 60000);
+
+    ngx_conf_merge_msec_value(conf->quic.tp.max_ack_delay,
+                              prev->quic.tp.max_ack_delay,
+                              NGX_QUIC_DEFAULT_MAX_ACK_DELAY);
+
+    ngx_conf_merge_size_value(conf->quic.tp.max_udp_payload_size,
+                              prev->quic.tp.max_udp_payload_size,
+                              NGX_QUIC_MAX_UDP_PAYLOAD_SIZE);
+
+    ngx_conf_merge_size_value(conf->quic.tp.initial_max_data,
+                              prev->quic.tp.initial_max_data,
+                              16 * NGX_QUIC_STREAM_BUFSIZE);
+
+    ngx_conf_merge_size_value(conf->quic.tp.initial_max_stream_data_bidi_local,
+                              prev->quic.tp.initial_max_stream_data_bidi_local,
+                              NGX_QUIC_STREAM_BUFSIZE);
+
+    ngx_conf_merge_size_value(conf->quic.tp.initial_max_stream_data_bidi_remote,
+                              prev->quic.tp.initial_max_stream_data_bidi_remote,
+                              NGX_QUIC_STREAM_BUFSIZE);
+
+    ngx_conf_merge_size_value(conf->quic.tp.initial_max_stream_data_uni,
+                              prev->quic.tp.initial_max_stream_data_uni,
+                              NGX_QUIC_STREAM_BUFSIZE);
+
+    ngx_conf_merge_uint_value(conf->quic.tp.initial_max_streams_bidi,
+                              prev->quic.tp.initial_max_streams_bidi, 16);
+
+    ngx_conf_merge_uint_value(conf->quic.tp.initial_max_streams_uni,
+                              prev->quic.tp.initial_max_streams_uni, 3);
+
+    ngx_conf_merge_uint_value(conf->quic.tp.ack_delay_exponent,
+                              prev->quic.tp.ack_delay_exponent,
+                              NGX_QUIC_DEFAULT_ACK_DELAY_EXPONENT);
+
+    ngx_conf_merge_value(conf->quic.tp.disable_active_migration,
+                              prev->quic.tp.disable_active_migration, 0);
+
+    ngx_conf_merge_uint_value(conf->quic.tp.active_connection_id_limit,
+                              prev->quic.tp.active_connection_id_limit, 2);
+
+    ngx_conf_merge_value(conf->quic.retry, prev->quic.retry, 0);
+    ngx_conf_merge_value(conf->quic.gso_enabled, prev->quic.gso_enabled, 0);
+
+    ngx_conf_merge_str_value(conf->quic.host_key, prev->quic.host_key, "");
+
+    if (conf->quic.host_key.len == 0) {
+
+        conf->quic.host_key.len = NGX_QUIC_DEFAULT_HOST_KEY_LEN;
+        conf->quic.host_key.data = ngx_palloc(cf->pool,
+                                              conf->quic.host_key.len);
+        if (conf->quic.host_key.data == NULL) {
+            return NGX_CONF_ERROR;
+        }
+
+        if (RAND_bytes(conf->quic.host_key.data, NGX_QUIC_DEFAULT_HOST_KEY_LEN)
+            <= 0)
+        {
+            return NGX_CONF_ERROR;
+        }
+    }
+
+    if (ngx_quic_derive_key(cf->log, "av_token_key",
+                            &conf->quic.host_key, &ngx_http_quic_salt,
+                            conf->quic.av_token_key, NGX_QUIC_AV_KEY_LEN)
+        != NGX_OK)
+    {
+        return NGX_CONF_ERROR;
+    }
+
+    if (ngx_quic_derive_key(cf->log, "sr_token_key",
+                            &conf->quic.host_key, &ngx_http_quic_salt,
+                            conf->quic.sr_token_key, NGX_QUIC_SR_KEY_LEN)
+        != NGX_OK)
+    {
+        return NGX_CONF_ERROR;
+    }
+
+    sscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_ssl_module);
+    conf->quic.ssl = &sscf->ssl;
+
     return NGX_CONF_OK;
 }
 
 
+static char *
+ngx_http_quic_max_ack_delay(ngx_conf_t *cf, void *post, void *data)
+{
+    ngx_msec_t *sp = data;
+
+    if (*sp >= 16384) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "\"quic_max_ack_delay\" must be less than 16384");
+
+        return NGX_CONF_ERROR;
+    }
+
+    return NGX_CONF_OK;
+}
+
+
+static char *
+ngx_http_quic_max_udp_payload_size(ngx_conf_t *cf, void *post, void *data)
+{
+    size_t *sp = data;
+
+    if (*sp < NGX_QUIC_MIN_INITIAL_SIZE
+        || *sp > NGX_QUIC_MAX_UDP_PAYLOAD_SIZE)
+    {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "\"quic_max_udp_payload_size\" must be between "
+                           "%d and %d",
+                           NGX_QUIC_MIN_INITIAL_SIZE,
+                           NGX_QUIC_MAX_UDP_PAYLOAD_SIZE);
+
+        return NGX_CONF_ERROR;
+    }
+
+    return NGX_CONF_OK;
+}
+
+
+static char *
+ngx_http_quic_host_key(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    ngx_http_v3_srv_conf_t  *h3scf = conf;
+
+    u_char           *buf;
+    size_t            size;
+    ssize_t           n;
+    ngx_str_t        *value;
+    ngx_file_t        file;
+    ngx_file_info_t   fi;
+    ngx_quic_conf_t  *qcf;
+
+    qcf = &h3scf->quic;
+
+    if (qcf->host_key.len) {
+        return "is duplicate";
+    }
+
+    buf = NULL;
+#if (NGX_SUPPRESS_WARN)
+    size = 0;
+#endif
+
+    value = cf->args->elts;
+
+    if (ngx_conf_full_name(cf->cycle, &value[1], 1) != NGX_OK) {
+        return NGX_CONF_ERROR;
+    }
+
+    ngx_memzero(&file, sizeof(ngx_file_t));
+    file.name = value[1];
+    file.log = cf->log;
+
+    file.fd = ngx_open_file(file.name.data, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0);
+
+    if (file.fd == NGX_INVALID_FILE) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, ngx_errno,
+                           ngx_open_file_n " \"%V\" failed", &file.name);
+        return NGX_CONF_ERROR;
+    }
+
+    if (ngx_fd_info(file.fd, &fi) == NGX_FILE_ERROR) {
+        ngx_conf_log_error(NGX_LOG_CRIT, cf, ngx_errno,
+                           ngx_fd_info_n " \"%V\" failed", &file.name);
+        goto failed;
+    }
+
+    size = ngx_file_size(&fi);
+
+    if (size == 0) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "\"%V\" zero key size", &file.name);
+        goto failed;
+    }
+
+    buf = ngx_pnalloc(cf->pool, size);
+    if (buf == NULL) {
+        goto failed;
+    }
+
+    n = ngx_read_file(&file, buf, size, 0);
+
+    if (n == NGX_ERROR) {
+        ngx_conf_log_error(NGX_LOG_CRIT, cf, ngx_errno,
+                           ngx_read_file_n " \"%V\" failed", &file.name);
+        goto failed;
+    }
+
+    if ((size_t) n != size) {
+        ngx_conf_log_error(NGX_LOG_CRIT, cf, 0,
+                           ngx_read_file_n " \"%V\" returned only "
+                           "%z bytes instead of %uz", &file.name, n, size);
+        goto failed;
+    }
+
+    qcf->host_key.data = buf;
+    qcf->host_key.len = n;
+
+    if (ngx_close_file(file.fd) == NGX_FILE_ERROR) {
+        ngx_log_error(NGX_LOG_ALERT, cf->log, ngx_errno,
+                      ngx_close_file_n " \"%V\" failed", &file.name);
+    }
+
+    return NGX_CONF_OK;
+
+failed:
+
+    if (ngx_close_file(file.fd) == NGX_FILE_ERROR) {
+        ngx_log_error(NGX_LOG_ALERT, cf->log, ngx_errno,
+                      ngx_close_file_n " \"%V\" failed", &file.name);
+    }
+
+    if (buf) {
+        ngx_explicit_memzero(buf, size);
+    }
+
+    return NGX_CONF_ERROR;
+}
+
+
 static void *
 ngx_http_v3_create_loc_conf(ngx_conf_t *cf)
 {