Mercurial > hg > nginx-quic
annotate docs/html/50x.html @ 6909:5850fed24639
Upstream: read handler cleared on upstream finalization.
With "proxy_ignore_client_abort off" (the default), upstream module changes
r->read_event_handler to ngx_http_upstream_rd_check_broken_connection().
If the handler is not cleared during upstream finalization, it can be
triggered later, causing unexpected effects, if, for example, a request
was redirected to a different location using error_page or X-Accel-Redirect.
In particular, it makes "proxy_ignore_client_abort on" non-working after
a redirection in a configuration like this:
location = / {
error_page 502 = /error;
proxy_pass http://127.0.0.1:8082;
}
location /error {
proxy_pass http://127.0.0.1:8083;
proxy_ignore_client_abort on;
}
It is also known to cause segmentation faults with aio used, see
http://mailman.nginx.org/pipermail/nginx-ru/2015-August/056570.html.
Fix is to explicitly set r->read_event_handler to ngx_http_block_reading()
during upstream finalization, similar to how it is done in the request body
reading code and in the limit_req module.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Fri, 10 Feb 2017 20:24:26 +0300 |
parents | b5ba6f22a0fc |
children | 1cd63ae46243 |
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Valentin Bartenev <vbart@nginx.com>
parents:
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1 <!DOCTYPE html> |
657 | 2 <html> |
3 <head> | |
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4 <title>Error</title> |
657 | 5 <style> |
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6 body { |
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Valentin Bartenev <vbart@nginx.com>
parents:
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7 width: 35em; |
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parents:
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8 margin: 0 auto; |
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parents:
663
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9 font-family: Tahoma, Verdana, Arial, sans-serif; |
b5ba6f22a0fc
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Valentin Bartenev <vbart@nginx.com>
parents:
663
diff
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10 } |
657 | 11 </style> |
12 </head> | |
4840
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Valentin Bartenev <vbart@nginx.com>
parents:
663
diff
changeset
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13 <body> |
b5ba6f22a0fc
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Valentin Bartenev <vbart@nginx.com>
parents:
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14 <h1>An error occurred.</h1> |
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parents:
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15 <p>Sorry, the page you are looking for is currently unavailable.<br/> |
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parents:
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16 Please try again later.</p> |
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Valentin Bartenev <vbart@nginx.com>
parents:
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17 <p>If you are the system administrator of this resource then you should check |
b5ba6f22a0fc
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Valentin Bartenev <vbart@nginx.com>
parents:
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18 the <a href="http://nginx.org/r/error_log">error log</a> for details.</p> |
b5ba6f22a0fc
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Valentin Bartenev <vbart@nginx.com>
parents:
663
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19 <p><em>Faithfully yours, nginx.</em></p> |
657 | 20 </body> |
21 </html> |