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The following config caused segmentation fault due to conf->file not
being properly set if "ssl on" was inherited from the http level:
http {
ssl on;
server {
}
}
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Previously nginx used to mark backend again as live as soon as fail_timeout
passes (10s by default) since last failure. On the other hand, detecting
dead backend takes up to 60s (proxy_connect_timeout) in typical situation
"backend is down and doesn't respond to any packets". This resulted in
suboptimal behaviour in the above situation (up to 23% of requests were
directed to dead backend with default settings).
More detailed description of the problem may be found here (in Russian):
http://mailman.nginx.org/pipermail/nginx-ru/2011-August/042172.html
Fix is to only allow one request after fail_timeout passes, and
mark backend as "live" only if this request succeeds.
Note that with new code backend will not be marked "live" unless "check"
request is completed, and this may take a while in some specific workloads
(e.g. streaming). This is believed to be acceptable.
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This prevents incorrect behaviour when another redirect is issued within
error_page 302 handler.
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Noted by Piotr Sikora.
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This fixes double gzipping in case of gzip filter being enabled while perl
returns already gzipped response.
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For files with '?' in their names autoindex generated links with '?' not
escaped. This resulted in effectively truncated links as '?' indicates
query string start.
This is an updated version of the patch originally posted at [1]. It
introduces generic NGX_ESCAPE_URI_COMPONENT which escapes everything but
unreserved characters as per RFC 3986. This approach also renders unneeded
special colon processing (as colon is percent-encoded now), it's dropped
accordingly.
[1] http://nginx.org/pipermail/nginx-devel/2010-February/000112.html
Reported by Konstantin Leonov.
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Some character sets (notably ISO-8859-1) have C1 control characters in
upper half, make sure to escape them.
Reported by Jesus Olmos Gonzalez.
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Patch by Peter Smit.
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"start" parameter value.
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Big POST (not fully preread) to a
location / {
return 202;
}
resulted in incorrect behaviour due to "return" code path not calling
ngx_http_discard_request_body(). The same applies to all "return" used
with 2xx/3xx codes except 201 and 204, and to all "return ... text" uses.
Fix is to add ngx_http_discard_request_body() call to ngx_http_send_response()
function where it looks appropriate. Discard body call from emtpy gif module
removed as it's now redundant.
Reported by Pyry Hakulinen, see
http://mailman.nginx.org/pipermail/nginx/2011-August/028503.html
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Test case:
location / {
error_page 405 /nope;
return 405;
}
location /nope {
return 200;
}
This is expected to return 405 with empty body, but in 0.8.42+ will return
builtin 405 error page as well (though not counted in Content-Length, thus
breaking protocol).
Fix is to use status provided by rewrite script execution in case
it's less than NGX_HTTP_BAD_REQUEST even if r->error_status set. This
check is in line with one in ngx_http_script_return_code().
Note that this patch also changes behaviour for "return 302 ..." and
"rewrite ... redirect" used as error handler. E.g.
location / {
error_page 405 /redirect;
return 405;
}
location /redirect {
rewrite ^ http://example.com/;
}
will actually return redirect to "http://example.com/" instead of builtin 405
error page with meaningless Location header. This looks like correct change
and it's in line with what happens on e.g. directory redirects in error
handlers.
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Whitespaces after chunk size seems to be be allowed by the "implied *LWS" rule
and emitted by some servers.
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Fixed nearby grammar errors.
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By default we still send requests using HTTP/1.0. This may be changed with
new proxy_http_version directive.
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Once we know protocol version, set u->headers_in.connection_close to indicate
implicitly assumed connection close with HTTP before 1.1.
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By default follow the old behaviour, i.e. FASTCGI_KEEP_CONN flag isn't set
in request and application is responsible for closing connection once request
is done. To keep connections alive fastcgi_keep_conn must be activated.
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Previous use of size_t may cause wierd effects on 32bit platforms with certain
big responses transferred in unbuffered mode.
Nuke "if (size > u->length)" check as it's not usefull anyway (preread
body data isn't subject to this check) and now requires additional check
for u->length being positive.
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We no longer use r->headers_out.content_length_n as a primary source of
backend's response length. Instead we parse response length to
u->headers_in.content_length_n and copy to r->headers_out.content_length_n
when needed.
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The ngx_chain_update_chains() needs pool to free chain links used for buffers
with non-matching tags. Providing one helps to reduce memory consumption
for long-lived requests.
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There were 2 buffers allocated on each buffer chain sent through chunked
filter (one buffer for chunk size, another one for trailing CRLF, about
120 bytes in total on 32-bit platforms). This resulted in large memory
consumption with long-lived requests sending many buffer chains. Usual
example of problematic scenario is streaming though proxy with
proxy_buffering set to off.
Introduced buffers reuse reduces memory consumption in the above problematic
scenario.
See here for initial report:
http://mailman.nginx.org/pipermail/nginx/2010-April/019814.html
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