annotate src/core/ngx_crc.h @ 7355:b64adc956643

Rewrite: removed r->err_status special handling (ticket #1634). Trying to look into r->err_status in the "return" directive makes it behave differently than real errors generated in other parts of the code, and is an endless source of various problems. This behaviour was introduced in 726:7b71936d5299 (0.4.4) with the comment "fix: "return" always overrode "error_page" response code". It is not clear if there were any real cases this was expected to fix, but there are several cases which are broken due to this change, some previously fixed (4147:7f64de1cc2c0). In ticket #1634, the problem is that when r->err_status is set to a non-special status code, it is not possible to return a response by simply returning r->err_status. If this is the case, the only option is to return script's e->status instead. An example configuration: location / { error_page 404 =200 /err502; return 404; } location = /err502 { return 502; } After the change, such a configuration will properly return standard 502 error, much like it happens when a 502 error is generated by proxy_pass. This also fixes the following configuration to properly close connection as clearly requested by "return 444": location / { error_page 404 /close; return 404; } location = /close { return 444; } Previously, this required "error_page 404 = /close;" to work as intended.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 21 Sep 2018 15:59:33 +0300
parents d620f497c50f
children
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #ifndef _NGX_CRC_H_INCLUDED_
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9 #define _NGX_CRC_H_INCLUDED_
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12 #include <ngx_config.h>
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13 #include <ngx_core.h>
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16 /* 32-bit crc16 */
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18 static ngx_inline uint32_t
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19 ngx_crc(u_char *data, size_t len)
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20 {
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21 uint32_t sum;
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23 for (sum = 0; len; len--) {
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25 /*
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26 * gcc 2.95.2 x86 and icc 7.1.006 compile
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27 * that operator into the single "rol" opcode,
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28 * msvc 6.0sp2 compiles it into four opcodes.
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29 */
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30 sum = sum >> 1 | sum << 31;
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32 sum += *data++;
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33 }
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35 return sum;
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36 }
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39 #endif /* _NGX_CRC_H_INCLUDED_ */