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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> |
|---|---|
| date | Fri, 10 Feb 2017 20:24:26 +0300 |
| parents | b5ba6f22a0fc |
| children | 1cd63ae46243 |
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<!DOCTYPE html> <html> <head> <title>Error</title> <style> body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } </style> </head> <body> <h1>An error occurred.</h1> <p>Sorry, the page you are looking for is currently unavailable.<br/> Please try again later.</p> <p>If you are the system administrator of this resource then you should check the <a href="http://nginx.org/r/error_log">error log</a> for details.</p> <p><em>Faithfully yours, nginx.</em></p> </body> </html>