view proxy_cache_error.t @ 1825:3629eda94c1b

Tests: handling of EWOULDBLOCK from sysread() with IO::Socket::SSL. With IO::Socket::SSL, when select() reports that the socket is readable, reading from it might still fail with EWOULDBLOCK, since no application data is available in the socket. In particular, this might happen with TLSv1.3 when a session ticket is received after the handshake. Fix is to explicitly check for EWOULDBLOCK errors.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 21 Mar 2023 02:57:39 +0300
parents 4f238efded81
children
line wrap: on
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#!/usr/bin/perl

# (C) Maxim Dounin

# Tests for http proxy cache, "header already sent" alerts on backend errors,
# http://mailman.nginx.org/pipermail/nginx-devel/2018-January/010737.html.

###############################################################################

use warnings;
use strict;

use Test::More;

BEGIN { use FindBin; chdir($FindBin::Bin); }

use lib 'lib';
use Test::Nginx;

###############################################################################

select STDERR; $| = 1;
select STDOUT; $| = 1;

my $t = Test::Nginx->new()->has(qw/http proxy cache/)->plan(1)
	->write_file_expand('nginx.conf', <<'EOF');

%%TEST_GLOBALS%%

daemon off;

events {
}

http {
    %%TEST_GLOBALS_HTTP%%

    proxy_cache_path   %%TESTDIR%%/cache  levels=1:2
                       keys_zone=NAME:1m;

    server {
        listen       127.0.0.1:8080;
        server_name  localhost;

        location / {
            proxy_pass    http://127.0.0.1:8081;
            proxy_cache   NAME;

            proxy_read_timeout 500ms;
        }
    }

    server {
        listen       127.0.0.1:8081;
        server_name  localhost;

        location / {
            postpone_output 0;
            limit_rate 512;
            expires 1m;
        }
    }
}

EOF

$t->write_file('big.html', 'x' x 1024);

$t->run();

###############################################################################

# make a HEAD request; since cache is enabled, nginx converts HEAD to GET
# and will set u->pipe->downstream_error to suppress sending the response
# body to the client

like(http_head('/big.html'), qr/200 OK/, 'head request');

# once proxy_read_timeout expires, nginx will call
# ngx_http_finalize_upstream_request() with u->pipe->downstream_error set
# and rc = NGX_HTTP_BAD_GATEWAY; after revision ad3f342f14ba046c this
# will result in ngx_http_finalize_request(NGX_HTTP_BAD_GATEWAY),
# leading to an attempt to return additional error response and
# the "header already sent" alert; fixed in 93abb5a855d6

###############################################################################