Mercurial > hg > nginx-quic
view src/core/ngx_queue.h @ 6749:f88a145b093e stable-1.10
HTTP/2: the "421 Misdirected Request" response (closes #848).
Since 4fbef397c753 nginx rejects with the 400 error any attempts of
requesting different host over the same connection, if the relevant
virtual server requires verification of a client certificate.
While requesting hosts other than negotiated isn't something legal
in HTTP/1.x, the HTTP/2 specification explicitly permits such requests
for connection reuse and has introduced a special response code 421.
According to RFC 7540 Section 9.1.2 this code can be sent by a server
that is not configured to produce responses for the combination of
scheme and authority that are included in the request URI. And the
client may retry the request over a different connection.
Now this code is used for requests that aren't authorized in current
connection. After receiving the 421 response a client will be able
to open a new connection, provide the required certificate and retry
the request.
Unfortunately, not all clients currently are able to handle it well.
Notably Chrome just shows an error, while at least the latest version
of Firefox retries the request over a new connection.
author | Valentin Bartenev <vbart@nginx.com> |
---|---|
date | Fri, 20 May 2016 18:41:17 +0300 |
parents | d620f497c50f |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #ifndef _NGX_QUEUE_H_INCLUDED_ #define _NGX_QUEUE_H_INCLUDED_ typedef struct ngx_queue_s ngx_queue_t; struct ngx_queue_s { ngx_queue_t *prev; ngx_queue_t *next; }; #define ngx_queue_init(q) \ (q)->prev = q; \ (q)->next = q #define ngx_queue_empty(h) \ (h == (h)->prev) #define ngx_queue_insert_head(h, x) \ (x)->next = (h)->next; \ (x)->next->prev = x; \ (x)->prev = h; \ (h)->next = x #define ngx_queue_insert_after ngx_queue_insert_head #define ngx_queue_insert_tail(h, x) \ (x)->prev = (h)->prev; \ (x)->prev->next = x; \ (x)->next = h; \ (h)->prev = x #define ngx_queue_head(h) \ (h)->next #define ngx_queue_last(h) \ (h)->prev #define ngx_queue_sentinel(h) \ (h) #define ngx_queue_next(q) \ (q)->next #define ngx_queue_prev(q) \ (q)->prev #if (NGX_DEBUG) #define ngx_queue_remove(x) \ (x)->next->prev = (x)->prev; \ (x)->prev->next = (x)->next; \ (x)->prev = NULL; \ (x)->next = NULL #else #define ngx_queue_remove(x) \ (x)->next->prev = (x)->prev; \ (x)->prev->next = (x)->next #endif #define ngx_queue_split(h, q, n) \ (n)->prev = (h)->prev; \ (n)->prev->next = n; \ (n)->next = q; \ (h)->prev = (q)->prev; \ (h)->prev->next = h; \ (q)->prev = n; #define ngx_queue_add(h, n) \ (h)->prev->next = (n)->next; \ (n)->next->prev = (h)->prev; \ (h)->prev = (n)->prev; \ (h)->prev->next = h; #define ngx_queue_data(q, type, link) \ (type *) ((u_char *) q - offsetof(type, link)) ngx_queue_t *ngx_queue_middle(ngx_queue_t *queue); void ngx_queue_sort(ngx_queue_t *queue, ngx_int_t (*cmp)(const ngx_queue_t *, const ngx_queue_t *)); #endif /* _NGX_QUEUE_H_INCLUDED_ */