/*
* Copyright (C) Roman Arutyunyan
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
/* static table indices */
#define NGX_HTTP_V3_HEADER_AUTHORITY 0
#define NGX_HTTP_V3_HEADER_PATH_ROOT 1
#define NGX_HTTP_V3_HEADER_CONTENT_LENGTH_ZERO 4
#define NGX_HTTP_V3_HEADER_DATE 6
#define NGX_HTTP_V3_HEADER_LAST_MODIFIED 10
#define NGX_HTTP_V3_HEADER_LOCATION 12
#define NGX_HTTP_V3_HEADER_METHOD_GET 17
#define NGX_HTTP_V3_HEADER_SCHEME_HTTP 22
#define NGX_HTTP_V3_HEADER_SCHEME_HTTPS 23
#define NGX_HTTP_V3_HEADER_STATUS_200 25
#define NGX_HTTP_V3_HEADER_ACCEPT_ENCODING 31
#define NGX_HTTP_V3_HEADER_CONTENT_TYPE_TEXT_PLAIN 53
#define NGX_HTTP_V3_HEADER_VARY_ACCEPT_ENCODING 59
#define NGX_HTTP_V3_HEADER_ACCEPT_LANGUAGE 72
#define NGX_HTTP_V3_HEADER_SERVER 92
#define NGX_HTTP_V3_HEADER_USER_AGENT 95
typedef struct {
ngx_chain_t *free;
ngx_chain_t *busy;
} ngx_http_v3_filter_ctx_t;
static ngx_int_t ngx_http_v3_header_filter(ngx_http_request_t *r);
static ngx_int_t ngx_http_v3_body_filter(ngx_http_request_t *r,
ngx_chain_t *in);
static ngx_chain_t *ngx_http_v3_create_trailers(ngx_http_request_t *r,
ngx_http_v3_filter_ctx_t *ctx);
static ngx_int_t ngx_http_v3_filter_init(ngx_conf_t *cf);
static ngx_http_module_t ngx_http_v3_filter_module_ctx = {
NULL, /* preconfiguration */
ngx_http_v3_filter_init, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
NULL /* merge location configuration */
};
ngx_module_t ngx_http_v3_filter_module = {
NGX_MODULE_V1,
&ngx_http_v3_filter_module_ctx, /* module context */
NULL, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
static ngx_int_t
ngx_http_v3_header_filter(ngx_http_request_t *r)
{
u_char *p;
size_t len, n;
ngx_buf_t *b;
ngx_str_t host, location;
ngx_uint_t i, port;
ngx_chain_t *out, *hl, *cl, **ll;
ngx_list_part_t *part;
ngx_table_elt_t *header;
ngx_connection_t *c;
ngx_http_v3_session_t *h3c;
ngx_http_v3_filter_ctx_t *ctx;
ngx_http_core_loc_conf_t *clcf;
ngx_http_core_srv_conf_t *cscf;
u_char addr[NGX_SOCKADDR_STRLEN];
if (r->http_version != NGX_HTTP_VERSION_30) {
return ngx_http_next_header_filter(r);
}
if (r->header_sent) {
return NGX_OK;
}
r->header_sent = 1;
if (r != r->main) {
return NGX_OK;
}
h3c = ngx_http_v3_get_session(r->connection);
if (r->method == NGX_HTTP_HEAD) {
r->header_only = 1;
}
if (r->headers_out.last_modified_time != -1) {
if (r->headers_out.status != NGX_HTTP_OK
&& r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
&& r->headers_out.status != NGX_HTTP_NOT_MODIFIED)
{
r->headers_out.last_modified_time = -1;
r->headers_out.last_modified = NULL;
}
}
if (r->headers_out.status == NGX_HTTP_NO_CONTENT) {
r->header_only = 1;
ngx_str_null(&r->headers_out.content_type);
r->headers_out.last_modified_time = -1;
r->headers_out.last_modified = NULL;
r->headers_out.content_length = NULL;
r->headers_out.content_length_n = -1;
}
if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
r->header_only = 1;
}
c = r->connection;
out = NULL;
ll = &out;
len = ngx_http_v3_encode_field_section_prefix(NULL, 0, 0, 0);
if (r->headers_out.status == NGX_HTTP_OK) {
len += ngx_http_v3_encode_field_ri(NULL, 0,
NGX_HTTP_V3_HEADER_STATUS_200);
} else {
len += ngx_http_v3_encode_field_lri(NULL, 0,
NGX_HTTP_V3_HEADER_STATUS_200,
NULL, 3);
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (r->headers_out.server == NULL) {
if (clcf->server_tokens == NGX_HTTP_SERVER_TOKENS_ON) {
n = sizeof(NGINX_VER) - 1;
} else if (clcf->server_tokens == NGX_HTTP_SERVER_TOKENS_BUILD) {
n = sizeof(NGINX_VER_BUILD) - 1;
} else {
n = sizeof("nginx") - 1;
}
len += ngx_http_v3_encode_field_lri(NULL, 0,
NGX_HTTP_V3_HEADER_SERVER,
NULL, n);
}
if (r->headers_out.date == NULL) {
len += ngx_http_v3_encode_field_lri(NULL, 0, NGX_HTTP_V3_HEADER_DATE,
NULL, ngx_cached_http_time.len);
}
if (r->headers_out.content_type.len) {
n = r->headers_out.content_type.len;
if (r->headers_out.content_type_len == r->headers_out.content_type.len
&& r->headers_out.charset.len)
{
n += sizeof("; charset=") - 1 + r->headers_out.charset.len;
}
len += ngx_http_v3_encode_field_lri(NULL, 0,
NGX_HTTP_V3_HEADER_CONTENT_TYPE_TEXT_PLAIN,
NULL, n);
}
if (r->headers_out.content_length == NULL) {
if (r->headers_out.content_length_n > 0) {
len += ngx_http_v3_encode_field_lri(NULL, 0,
NGX_HTTP_V3_HEADER_CONTENT_LENGTH_ZERO,
NULL, NGX_OFF_T_LEN);
} else if (r->headers_out.content_length_n == 0) {
len += ngx_http_v3_encode_field_ri(NULL, 0,
NGX_HTTP_V3_HEADER_CONTENT_LENGTH_ZERO);
}
}
if (r->headers_out.last_modified == NULL
&& r->headers_out.last_modified_time != -1)
{
len += ngx_http_v3_encode_field_lri(NULL, 0,
NGX_HTTP_V3_HEADER_LAST_MODIFIED, NULL,
sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1);
}
if (r->headers_out.location && r->headers_out.location->value.len) {
if (r->headers_out.location->value.data[0] == '/'
&& clcf->absolute_redirect)
{
if (clcf->server_name_in_redirect) {
cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
host = cscf->server_name;
} else if (r->headers_in.server.len) {
host = r->headers_in.server;
} else {
host.len = NGX_SOCKADDR_STRLEN;
host.data = addr;
if (ngx_connection_local_sockaddr(c, &host, 0) != NGX_OK) {
return NGX_ERROR;
}
}
port = ngx_inet_get_port(c->local_sockaddr);
location.len = sizeof("https://") - 1 + host.len
+ r->headers_out.location->value.len;
if (clcf->port_in_redirect) {
port = (port == 443) ? 0 : port;
} else {
port = 0;
}
if (port) {
location.len += sizeof(":65535") - 1;
}
location.data = ngx_pnalloc(r->pool, location.len);
if (location.data == NULL) {
return NGX_ERROR;
}
p = ngx_cpymem(location.data, "https://", sizeof("https://") - 1);
p = ngx_cpymem(p, host.data, host.len);
if (port) {
p = ngx_sprintf(p, ":%ui", port);
}
p = ngx_cpymem(p, r->headers_out.location->value.data,
r->headers_out.location->value.len);
/* update r->headers_out.location->value for possible logging */
r->headers_out.location->value.len = p - location.data;
r->headers_out.location->value.data = location.data;
ngx_str_set(&r->headers_out.location->key, "Location");
}
r->headers_out.location->hash = 0;
len += ngx_http_v3_encode_field_lri(NULL, 0,
NGX_HTTP_V3_HEADER_LOCATION, NULL,
r->headers_out.location->value.len);
}
#if (NGX_HTTP_GZIP)
if (r->gzip_vary) {
if (clcf->gzip_vary) {
len += ngx_http_v3_encode_field_ri(NULL, 0,
NGX_HTTP_V3_HEADER_VARY_ACCEPT_ENCODING);
} else {
r->gzip_vary = 0;
}
}
#endif
part = &r->headers_out.headers.part;
header = part->elts;
for (i = 0; /* void */; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
header = part->elts;
i = 0;
}
if (header[i].hash == 0) {
continue;
}
len += ngx_http_v3_encode_field_l(NULL, &header[i].key,
&header[i].value);
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 header len:%uz", len);
b = ngx_create_temp_buf(r->pool, len);
if (b == NULL) {
return NGX_ERROR;
}
b->last = (u_char *) ngx_http_v3_encode_field_section_prefix(b->last,
0, 0, 0);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 output header: \":status: %03ui\"",
r->headers_out.status);
if (r->headers_out.status == NGX_HTTP_OK) {
b->last = (u_char *) ngx_http_v3_encode_field_ri(b->last, 0,
NGX_HTTP_V3_HEADER_STATUS_200);
} else {
b->last = (u_char *) ngx_http_v3_encode_field_lri(b->last, 0,
NGX_HTTP_V3_HEADER_STATUS_200,
NULL, 3);
b->last = ngx_sprintf(b->last, "%03ui", r->headers_out.status);
}
if (r->headers_out.server == NULL) {
if (clcf->server_tokens == NGX_HTTP_SERVER_TOKENS_ON) {
p = (u_char *) NGINX_VER;
n = sizeof(NGINX_VER) - 1;
} else if (clcf->server_tokens == NGX_HTTP_SERVER_TOKENS_BUILD) {
p = (u_char *) NGINX_VER_BUILD;
n = sizeof(NGINX_VER_BUILD) - 1;
} else {
p = (u_char *) "nginx";
n = sizeof("nginx") - 1;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 output header: \"server: %*s\"", n, p);
b->last = (u_char *) ngx_http_v3_encode_field_lri(b->last, 0,
NGX_HTTP_V3_HEADER_SERVER,
p, n);
}
if (r->headers_out.date == NULL) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 output header: \"date: %V\"",
&ngx_cached_http_time);
b->last = (u_char *) ngx_http_v3_encode_field_lri(b->last, 0,
NGX_HTTP_V3_HEADER_DATE,
ngx_cached_http_time.data,
ngx_cached_http_time.len);
}
if (r->headers_out.content_type.len) {
if (r->headers_out.content_type_len == r->headers_out.content_type.len
&& r->headers_out.charset.len)
{
n = r->headers_out.content_type.len + sizeof("; charset=") - 1
+ r->headers_out.charset.len;
p = ngx_pnalloc(r->pool, n);
if (p == NULL) {
return NGX_ERROR;
}
p = ngx_cpymem(p, r->headers_out.content_type.data,
r->headers_out.content_type.len);
p = ngx_cpymem(p, "; charset=", sizeof("; charset=") - 1);
p = ngx_cpymem(p, r->headers_out.charset.data,
r->headers_out.charset.len);
/* updated r->headers_out.content_type is also needed for logging */
r->headers_out.content_type.len = n;
r->headers_out.content_type.data = p - n;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 output header: \"content-type: %V\"",
&r->headers_out.content_type);
b->last = (u_char *) ngx_http_v3_encode_field_lri(b->last, 0,
NGX_HTTP_V3_HEADER_CONTENT_TYPE_TEXT_PLAIN,
r->headers_out.content_type.data,
r->headers_out.content_type.len);
}
if (r->headers_out.content_length == NULL
&& r->headers_out.content_length_n >= 0)
{
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 output header: \"content-length: %O\"",
r->headers_out.content_length_n);
if (r->headers_out.content_length_n > 0) {
p = ngx_sprintf(b->last, "%O", r->headers_out.content_length_n);
n = p - b->last;
b->last = (u_char *) ngx_http_v3_encode_field_lri(b->last, 0,
NGX_HTTP_V3_HEADER_CONTENT_LENGTH_ZERO,
NULL, n);
b->last = ngx_sprintf(b->last, "%O",
r->headers_out.content_length_n);
} else {
b->last = (u_char *) ngx_http_v3_encode_field_ri(b->last, 0,
NGX_HTTP_V3_HEADER_CONTENT_LENGTH_ZERO);
}
}
if (r->headers_out.last_modified == NULL
&& r->headers_out.last_modified_time != -1)
{
n = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
p = ngx_pnalloc(r->pool, n);
if (p == NULL) {
return NGX_ERROR;
}
ngx_http_time(p, r->headers_out.last_modified_time);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 output header: \"last-modified: %*s\"", n, p);
b->last = (u_char *) ngx_http_v3_encode_field_lri(b->last, 0,
NGX_HTTP_V3_HEADER_LAST_MODIFIED,
p, n);
}
if (r->headers_out.location && r->headers_out.location->value.len) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 output header: \"location: %V\"",
&r->headers_out.location->value);
b->last = (u_char *) ngx_http_v3_encode_field_lri(b->last, 0,
NGX_HTTP_V3_HEADER_LOCATION,
r->headers_out.location->value.data,
r->headers_out.location->value.len);
}
#if (NGX_HTTP_GZIP)
if (r->gzip_vary) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 output header: \"vary: Accept-Encoding\"");
b->last = (u_char *) ngx_http_v3_encode_field_ri(b->last, 0,
NGX_HTTP_V3_HEADER_VARY_ACCEPT_ENCODING);
}
#endif
part = &r->headers_out.headers.part;
header = part->elts;
for (i = 0; /* void */; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
header = part->elts;
i = 0;
}
if (header[i].hash == 0) {
continue;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 output header: \"%V: %V\"",
&header[i].key, &header[i].value);
b->last = (u_char *) ngx_http_v3_encode_field_l(b->last,
&header[i].key,
&header[i].value);
}
if (r->header_only) {
b->last_buf = 1;
}
cl = ngx_alloc_chain_link(r->pool);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf = b;
cl->next = NULL;
n = b->last - b->pos;
h3c->payload_bytes += n;
len = ngx_http_v3_encode_varlen_int(NULL, NGX_HTTP_V3_FRAME_HEADERS)
+ ngx_http_v3_encode_varlen_int(NULL, n);
b = ngx_create_temp_buf(r->pool, len);
if (b == NULL) {
return NGX_ERROR;
}
b->last = (u_char *) ngx_http_v3_encode_varlen_int(b->last,
NGX_HTTP_V3_FRAME_HEADERS);
b->last = (u_char *) ngx_http_v3_encode_varlen_int(b->last, n);
hl = ngx_alloc_chain_link(r->pool);
if (hl == NULL) {
return NGX_ERROR;
}
hl->buf = b;
hl->next = cl;
*ll = hl;
ll = &cl->next;
if (r->headers_out.content_length_n >= 0
&& !r->header_only && !r->expect_trailers)
{
len = ngx_http_v3_encode_varlen_int(NULL, NGX_HTTP_V3_FRAME_DATA)
+ ngx_http_v3_encode_varlen_int(NULL,
r->headers_out.content_length_n);
b = ngx_create_temp_buf(r->pool, len);
if (b == NULL) {
return NGX_ERROR;
}
b->last = (u_char *) ngx_http_v3_encode_varlen_int(b->last,
NGX_HTTP_V3_FRAME_DATA);
b->last = (u_char *) ngx_http_v3_encode_varlen_int(b->last,
r->headers_out.content_length_n);
h3c->payload_bytes += r->headers_out.content_length_n;
h3c->total_bytes += r->headers_out.content_length_n;
cl = ngx_alloc_chain_link(r->pool);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf = b;
cl->next = NULL;
*ll = cl;
} else {
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_v3_filter_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
}
ngx_http_set_ctx(r, ctx, ngx_http_v3_filter_module);
}
for (cl = out; cl; cl = cl->next) {
h3c->total_bytes += cl->buf->last - cl->buf->pos;
r->header_size += cl->buf->last - cl->buf->pos;
}
return ngx_http_write_filter(r, out);
}
static ngx_int_t
ngx_http_v3_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
u_char *chunk;
off_t size;
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t *out, *cl, *tl, **ll;
ngx_http_v3_session_t *h3c;
ngx_http_v3_filter_ctx_t *ctx;
if (in == NULL) {
return ngx_http_next_body_filter(r, in);
}
ctx = ngx_http_get_module_ctx(r, ngx_http_v3_filter_module);
if (ctx == NULL) {
return ngx_http_next_body_filter(r, in);
}
h3c = ngx_http_v3_get_session(r->connection);
out = NULL;
ll = &out;
size = 0;
cl = in;
for ( ;; ) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http3 chunk: %O", ngx_buf_size(cl->buf));
size += ngx_buf_size(cl->buf);
if (cl->buf->flush
|| cl->buf->sync
|| ngx_buf_in_memory(cl->buf)
|| cl->buf->in_file)
{
tl = ngx_alloc_chain_link(r->pool);
if (tl == NULL) {
return NGX_ERROR;
}
tl->buf = cl->buf;
*ll = tl;
ll = &tl->next;
}
if (cl->next == NULL) {
break;
}
cl = cl->next;
}
if (size) {
tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
if (tl == NULL) {
return NGX_ERROR;
}
b = tl->buf;
chunk = b->start;
if (chunk == NULL) {
chunk = ngx_palloc(r->pool, NGX_HTTP_V3_VARLEN_INT_LEN * 2);
if (chunk == NULL) {
return NGX_ERROR;
}
b->start = chunk;
b->end = chunk + NGX_HTTP_V3_VARLEN_INT_LEN * 2;
}
b->tag = (ngx_buf_tag_t) &ngx_http_v3_filter_module;
b->memory = 0;
b->temporary = 1;
b->pos = chunk;
b->last = (u_char *) ngx_http_v3_encode_varlen_int(chunk,
NGX_HTTP_V3_FRAME_DATA);
b->last = (u_char *) ngx_http_v3_encode_varlen_int(b->last, size);
tl->next = out;
out = tl;
h3c->payload_bytes += size;
}
if (cl->buf->last_buf) {
tl = ngx_http_v3_create_trailers(r, ctx);
if (tl == NULL) {
return NGX_ERROR;
}
cl->buf->last_buf = 0;
*ll = tl;
} else {
*ll = NULL;
}
for (cl = out; cl; cl = cl->next) {
h3c->total_bytes += cl->buf->last - cl->buf->pos;
}
rc = ngx_http_next_body_filter(r, out);
ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &out,
(ngx_buf_tag_t) &ngx_http_v3_filter_module);
return rc;
}
static ngx_chain_t *
ngx_http_v3_create_trailers(ngx_http_request_t *r,
ngx_http_v3_filter_ctx_t *ctx)
{
size_t len, n;
u_char *p;
ngx_buf_t *b;
ngx_uint_t i;
ngx_chain_t *cl, *hl;
ngx_list_part_t *part;
ngx_table_elt_t *header;
ngx_http_v3_session_t *h3c;
h3c = ngx_http_v3_get_session(r->connection);
len = 0;
part = &r->headers_out.trailers.part;
header = part->elts;
for (i = 0; /* void */; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
header = part->elts;
i = 0;
}
if (header[i].hash == 0) {
continue;
}
len += ngx_http_v3_encode_field_l(NULL, &header[i].key,
&header[i].value);
}
cl = ngx_chain_get_free_buf(r->pool, &ctx->free);
if (cl == NULL) {
return NULL;
}
b = cl->buf;
b->tag = (ngx_buf_tag_t) &ngx_http_v3_filter_module;
b->memory = 0;
b->last_buf = 1;
if (len == 0) {
b->temporary = 0;
b->pos = b->last = NULL;
return cl;
}
b->temporary = 1;
len += ngx_http_v3_encode_field_section_prefix(NULL, 0, 0, 0);
b->pos = ngx_palloc(r->pool, len);
if (b->pos == NULL) {
return NULL;
}
b->last = (u_char *) ngx_http_v3_encode_field_section_prefix(b->pos,
0, 0, 0);
part = &r->headers_out.trailers.part;
header = part->elts;
for (i = 0; /* void */; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
header = part->elts;
i = 0;
}
if (header[i].hash == 0) {
continue;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http3 output trailer: \"%V: %V\"",
&header[i].key, &header[i].value);
b->last = (u_char *) ngx_http_v3_encode_field_l(b->last,
&header[i].key,
&header[i].value);
}
n = b->last - b->pos;
h3c->payload_bytes += n;
hl = ngx_chain_get_free_buf(r->pool, &ctx->free);
if (hl == NULL) {
return NULL;
}
b = hl->buf;
p = b->start;
if (p == NULL) {
p = ngx_palloc(r->pool, NGX_HTTP_V3_VARLEN_INT_LEN * 2);
if (p == NULL) {
return NULL;
}
b->start = p;
b->end = p + NGX_HTTP_V3_VARLEN_INT_LEN * 2;
}
b->tag = (ngx_buf_tag_t) &ngx_http_v3_filter_module;
b->memory = 0;
b->temporary = 1;
b->pos = p;
b->last = (u_char *) ngx_http_v3_encode_varlen_int(p,
NGX_HTTP_V3_FRAME_HEADERS);
b->last = (u_char *) ngx_http_v3_encode_varlen_int(b->last, n);
hl->next = cl;
return hl;
}
static ngx_int_t
ngx_http_v3_filter_init(ngx_conf_t *cf)
{
ngx_http_next_header_filter = ngx_http_top_header_filter;
ngx_http_top_header_filter = ngx_http_v3_header_filter;
ngx_http_next_body_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_v3_body_filter;
return NGX_OK;
}
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