02 nginx 中几种 location 表达式的优先级问题
Posted 蓝风9
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了02 nginx 中几种 location 表达式的优先级问题相关的知识，希望对你有一定的参考价值。
前言
// 无论贫穷富贵, 家能给与我们的都是一样的
呵呵 这是一个 老生常谈的问题
从官方文档, 或者 各种博客 中都可以找到这个问题的相关描述
我们这里 只关注 location 上面的这五种写法, 不关注 location @name
可以看到的是 存在五种写法
从下面文档也可以看出 优先级大概是 精确匹配 > 前缀匹配2 > 正则匹配, 忽略大小写正则匹配 > 前缀匹配1
我们这里 核心关注的就是 这个顺序是如何实现的?
以下截图, 调试基于 nginx-1.18.0
location /api // 前缀匹配1
location = /api // 精确匹配
location ^~ /api // 前缀匹配2
location ~ /api // 正则匹配
location ~* /api // 忽略大小写正则匹配
测试用例
这里构造了一下 几种 location 都存在的配置
server
listen 80;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location /
root html;
index index.html index.htm;
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html
root html;
location ^~ /api/
root html;
index index.html index.htm;
proxy_pass http://localhost:8080/;
location = /exactly.html
root html/exactly;
index index.html index.htm;
location ^~ /exactly.html
root html/exactly;
index index.html index.htm;
location ~ /regex.*
root html/regex;
index index.html index.htm;
location ~* /RgxIgnoreCase.*
root html/regexIgnoreCase;
index index.html index.htm;
ngx_http_core_find_location
这个函数是 查询 location 的主要驱动
ngx_http_core_find_static_location 是查询前缀匹配相关的 locations
pclcf->regex_locations 是查询正则匹配相关的 locations
首先是查询 前缀匹配相关的 locations
如果是 匹配到 "location =", ngx_http_core_find_static_location 响应的是 NGX_OK, 这里直接响应 匹配到的结果, 速度最快
如果是 匹配到 "location ~^", ngx_http_core_find_static_location 响应的是 NGX_AGAIN | NGX_DECLINED, 但是它的 noregex 为 1, 因此 会跳过后面的 正则匹配相关
如果 匹配到 "location ", ngx_http_core_find_static_location 响应的是 NGX_AGAIN | NGX_DECLINED, 但是它的 noregex 为 0, 因此 如果接下来会尝试正则匹配, 如果匹配上使用 正则的结果, 如果匹配不上, 使用 "location " 匹配到的结果
如果 匹配到 "location ~", "location ~*", 那么走的是 下面的正则匹配相关, 结果为 正则匹配到的 loc_conf
ngx_http_core_find_static_location 这里面就是根据当前 uri 和前缀树进行匹配
如果是 uri 和 node->name 不匹配, 则根据大小 向左或者向右 迭代 node 节点
否则 uri 是 node->name 的一部分, 或者 node->name 是 uri 的一部分, 或者 完全匹配
如果 node->name 是 uri 的一部分, 继续向右迭代, 保留当前记录作为 最长匹配
如果 node->name 和 uri 完全匹配, 如果存在精确匹配, 则返回 NGX_OK
如果是 其他前缀匹配, 则记录当前记录作为最长匹配
如果 uri 是 node->name 的一部分, 继续向左迭代
这里有一个 auto_redirect 的配置是使用于 uri 为 "/api", 然后存在 "location /api/", "location ^~ /api/" 的场景, 这里之所以没有校验配置的最后一位为 "/", 是一位配置 auto_redirect 的地方会进行校验
对应于这里前缀匹配有 "location /", "location = /50x.html", "location ^~ /api/", "location = /exactly.html", "location ^~ /exactly.html"
构造出来的匹配树如下
# pclcf->static_locations 的 pattern 树如下
/ -> null, "/api/", null
"/api/" -> "/50x.html", null, "/exactly.html"
(gdb) print pclcf->static_locations
$16 = (ngx_http_location_tree_node_t *) 0x7fa048023f10
(gdb) print pclcf->static_locations->name
$17 = "/"
(gdb) print pclcf->static_locations->left
$18 = (ngx_http_location_tree_node_t *) 0x0
(gdb) print pclcf->static_locations->tree
$19 = (ngx_http_location_tree_node_t *) 0x7fa048023f40
(gdb) print pclcf->static_locations->right
$20 = (ngx_http_location_tree_node_t *) 0x0
(gdb) print pclcf->static_locations->tree->name
$21 = "a"
(gdb) print pclcf->static_locations->tree->left
$22 = (ngx_http_location_tree_node_t *) 0x7fa048023f70
(gdb) print pclcf->static_locations->tree->tree
$23 = (ngx_http_location_tree_node_t *) 0x0
(gdb) print pclcf->static_locations->tree->right
$24 = (ngx_http_location_tree_node_t *) 0x7fa048023fa8
(gdb) print pclcf->static_locations->tree->left->name
$25 = "5"
(gdb) print pclcf->static_locations->tree->left->left
$26 = (ngx_http_location_tree_node_t *) 0x0
(gdb) print pclcf->static_locations->tree->left->tree
$27 = (ngx_http_location_tree_node_t *) 0x0
(gdb) print pclcf->static_locations->tree->left->right
$28 = (ngx_http_location_tree_node_t *) 0x0
(gdb) print pclcf->static_locations->tree->right->name
$29 = "e"
(gdb) print pclcf->static_locations->tree->right->left
$30 = (ngx_http_location_tree_node_t *) 0x0
(gdb) print pclcf->static_locations->tree->right->tree
$31 = (ngx_http_location_tree_node_t *) 0x0
(gdb) print pclcf->static_locations->tree->right->right
$32 = (ngx_http_location_tree_node_t *) 0x0
(gdb) print pclcf->static_locations->exactly->name
There is no member named exactly.
(gdb) print pclcf->static_locations->inclusive->name
$33 = len = 1, data = 0x7fa04800f7fe "/"
(gdb) print pclcf->static_locations->exact->name
Cannot access memory at address 0x0
(gdb) print pclcf->static_locations->tree->exact->name
Cannot access memory at address 0x0
(gdb) print pclcf->static_locations->tree->inclusive->name
$34 = len = 5, data = 0x7fa048007a94 "/api/"
(gdb) print pclcf->static_locations->tree->left->exact->name
$35 = len = 9, data = 0x7fa048006653 "/50x.html"
(gdb) print pclcf->static_locations->tree->left->inclusive->name
Cannot access memory at address 0x0
(gdb) print pclcf->static_locations->tree->right->exact->name
$36 = len = 13, data = 0x7fa048008feb "/exactly.html"
(gdb) print pclcf->static_locations->tree->right->inclusive->name
$37 = len = 13, data = 0x7fa04801d8ec "/exactly.html"
location = /exactly.html
Breakpoint 2, ngx_http_core_find_static_location (r=0x7fa049800050,
node=0x7fa048023fa8) at src/http/ngx_http_core_module.c:1509
1509 if (node->exact)
(gdb) print node
$38 = (ngx_http_location_tree_node_t *) 0x7fa048023fa8
(gdb) print node->exact->name
$39 = len = 13, data = 0x7fa048008feb "/exactly.html"
(gdb) print r.uri
$40 = len = 13, data = 0x7fa04b800004 "/exactly.html HTTP/1.1\\r\\nHost"
(gdb) next
1510
(gdb) next
1511
(gdb) next
1530
(gdb) next
ngx_http_core_find_location (r=0x7fa049800050) at src/http/ngx_http_core_module.c:1393
1393 if (rc == NGX_AGAIN)
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1407 return rc;
(gdb) bt
#0 ngx_http_core_find_location (r=0x7fa049800050)
at src/http/ngx_http_core_module.c:1407
#1 0x0000000107d22f03 in ngx_http_core_find_config_phase (r=0x7fa049800050,
ph=0x7fa048025258) at src/http/ngx_http_core_module.c:953
#2 0x0000000107d22d3e in ngx_http_core_run_phases (r=0x7fa049800050)
at src/http/ngx_http_core_module.c:868
#3 0x0000000107d22cae in ngx_http_handler (r=0x7fa049800050)
at src/http/ngx_http_core_module.c:851
#4 0x0000000107d31f36 in ngx_http_process_request (r=0x7fa049800050)
at src/http/ngx_http_request.c:2060
#5 0x0000000107d3407a in ngx_http_process_request_headers (rev=0x107ee40d0)
at src/http/ngx_http_request.c:1480
#6 0x0000000107d33415 in ngx_http_process_request_line (rev=0x107ee40d0)
at src/http/ngx_http_request.c:1151
#7 0x0000000107d35979 in ngx_http_keepalive_handler (rev=0x107ee40d0)
at src/http/ngx_http_request.c:3333
#8 0x0000000107d1cc10 in ngx_kqueue_process_events (cycle=0x7fa048800c50,
timer=55093, flags=1) at src/event/modules/ngx_kqueue_module.c:669
#9 0x0000000107d0c9f6 in ngx_process_events_and_timers (cycle=0x7fa048800c50)
at src/event/ngx_event.c:247
#10 0x0000000107d1aac5 in ngx_worker_process_cycle (cycle=0x7fa048800c50, data=0x0)
at src/os/unix/ngx_process_cycle.c:750
#11 0x0000000107d17cfa in ngx_spawn_process (cycle=0x7fa048800c50,
proc=0x107d1aa10 <ngx_worker_process_cycle>, data=0x0,
name=0x107de2a1e "worker process", respawn=-3) at src/os/unix/ngx_process.c:199
#12 0x0000000107d19be7 in ngx_start_worker_processes (cycle=0x7fa048800c50, n=1,
type=-3) at src/os/unix/ngx_process_cycle.c:359
#13 0x0000000107d19558 in ngx_master_process_cycle (cycle=0x7fa048800c50)
at src/os/unix/ngx_process_cycle.c:131
#14 0x0000000107cd18ba in main (argc=3, argv=0x7ffee7f2f548) at src/core/nginx.c:382
location ^~ /api/
请注意下面 noregex 为 1, 不进行正则匹配
Breakpoint 3, ngx_http_core_find_static_location (r=0x7fa049804c50,
node=0x7fa048023f10) at src/http/ngx_http_core_module.c:1464
(gdb) print r->uri
$47 = len = 37,
data = 0x7fa049800004 "/api/HelloWorld/listFormWithoutHeader HTTP/1.1\\r\\nHost"
1464 rv = NGX_DECLINED;
(gdb) next
1468 if (node == NULL)
(gdb) next
1476 n = (len <= (size_t) node->len) ? len : node->len;
(gdb) print node->name
$44 = "/"
(gdb) next
1478 rc = ngx_filename_cmp(uri, node->name, n);
(gdb) next
1480 if (rc != 0)
(gdb) next
1486 if (len > (size_t) node->len)
(gdb) next
1488 if (node->inclusive)
(gdb) next
1490 r->loc_conf = node->inclusive->loc_conf;
(gdb) next
1491 rv = NGX_AGAIN;
(gdb) next
1493 node = node->tree;
(gdb) next
1494 uri += n;
(gdb) next
1495 len -= n;
(gdb) next
1497 continue;
(gdb) next
1468 if (node == NULL)
(gdb) next
1476 n = (len <= (size_t) node->len) ? len : node->len;
(gdb) print node->name
$45 = "a"
(gdb) next
1478 rc = ngx_filename_cmp(uri, node->name, n);
(gdb) next
1480 if (rc != 0)
(gdb) next
1486 if (len > (size_t) node->len)
(gdb) next
1488 if (node->inclusive)
(gdb) next
1490 r->loc_conf = node->inclusive->loc_conf;
(gdb) next
1491 rv = NGX_AGAIN;
(gdb) next
1493 node = node->tree;
(gdb) next
1494 uri += n;
(gdb) next
1495 len -= n;
(gdb) next
1497 continue;
(gdb) next
1468 if (node == NULL)
(gdb) next
1469 return rv;
(gdb) next
1530
(gdb) next
ngx_http_core_find_location (r=0x7fa049804c50) at src/http/ngx_http_core_module.c:1393
1393 if (rc == NGX_AGAIN)
(gdb) next
1396 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
(gdb) next
1398 noregex = clcf->noregex;
(gdb) next
1403 rc = ngx_http_core_find_location(r);
(gdb) print noregex
$46 = 1
(gdb) next
Breakpoint 3, ngx_http_core_find_static_location (r=0x7fa049804c50, node=0x0)
at src/http/ngx_http_core_module.c:1464
1464 rv = NGX_DECLINED;
(gdb) next
1468 if (node == NULL)
(gdb) next
1469 return rv;
(gdb) next
1530
(gdb) next
ngx_http_core_find_location (r=0x7fa049804c50) at src/http/ngx_http_core_module.c:1393
1393 if (rc == NGX_AGAIN)
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1414 if (noregex == 0 && pclcf->regex_locations)
(gdb) next
1442 return rc;
(gdb) bt
#0 ngx_http_core_find_location (r=0x7fa049804c50)
at src/http/ngx_http_core_module.c:1442
#1 0x0000000107d23366 in ngx_http_core_find_location (r=0x7fa049804c50)
at src/http/ngx_http_core_module.c:1403
#2 0x0000000107d22f03 in ngx_http_core_find_config_phase (r=0x7fa049804c50,
ph=0x7fa048025258) at src/http/ngx_http_core_module.c:953
#3 0x0000000107d22d3e in ngx_http_core_run_phases (r=0x7fa049804c50)
at src/http/ngx_http_core_module.c:868
#4 0x0000000107d22cae in ngx_http_handler (r=0x7fa049804c50)
at src/http/ngx_http_core_module.c:851
#5 0x0000000107d31f36 in ngx_http_process_request (r=0x7fa049804c50)
at src/http/ngx_http_request.c:2060
#6 0x0000000107d3407a in ngx_http_process_request_headers (rev=0x107ee40d0)
at src/http/ngx_http_request.c:1480
#7 0x0000000107d33415 in ngx_http_process_request_line (rev=0x107ee40d0)
at src/http/ngx_http_request.c:1151
#8 0x0000000107d3076d in ngx_http_wait_request_handler (rev=0x107ee40d0)
at src/http/ngx_http_request.c:500
#9 0x0000000107d1cc10 in ngx_kqueue_process_events (cycle=0x7fa048800c50,
timer=59999, flags=1) at src/event/modules/ngx_kqueue_module.c:669
#10 0x0000000107d0c9f6 in ngx_process_events_and_timers (cycle=0x7fa048800c50)
at src/event/ngx_event.c:247
#11 0x0000000107d1aac5 in ngx_worker_process_cycle (cycle=0x7fa048800c50, data=0x0)
at src/os/unix/ngx_process_cycle.c:750
#12 0x0000000107d17cfa in ngx_spawn_process (cycle=0x7fa048800c50,
proc=0x107d1aa10 <ngx_worker_process_cycle>, data=0x0,
name=0x107de2a1e "worker process", respawn=-3) at src/os/unix/ngx_process.c:199
#13 0x0000000107d19be7 in ngx_start_worker_processes (cycle=0x7fa048800c50, n=1,
type=-3) at src/os/unix/ngx_process_cycle.c:359
#14 0x0000000107d19558 in ngx_master_process_cycle (cycle=0x7fa048800c50)
at src/os/unix/ngx_process_cycle.c:131
#15 0x0000000107cd18ba in main (argc=3, argv=0x7ffee7f2f548) at src/core/nginx.c:382
(gdb)
location ~ /regex.*
没有 "location =" 或者 "location ^~" 的匹配, 查询正则匹配
Breakpoint 1, ngx_http_core_find_location (r=0x7fa04800f850)
at src/http/ngx_http_core_module.c:1391
1391 rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
(gdb) next
1393 if (rc == NGX_AGAIN)
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1414 if (noregex == 0 && pclcf->regex_locations)
(gdb) next
1442 return rc;
(gdb) next
1443
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1414 if (noregex == 0 && pclcf->regex_locations)
(gdb) next
1416 for (clcfp = pclcf->regex_locations; *clcfp; clcfp++)
(gdb) next
1421 n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
(gdb) print (*clcfp)->regex
$54 = (ngx_http_regex_t *) 0x7fa048020248
(gdb) print (*clcfp)->regex->pattern
There is no member named pattern.
(gdb) print (*clcfp)->regex->name
$55 = len = 8, data = 0x7fa04801edcb "/regex.*"
(gdb) next
1423 if (n == NGX_OK)
(gdb) next
1424 r->loc_conf = (*clcfp)->loc_conf;
(gdb) next
1428 rc = ngx_http_core_find_location(r);
(gdb) next
Breakpoint 1, ngx_http_core_find_location (r=0x7fa04800f850)
at src/http/ngx_http_core_module.c:1391
1391 rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
(gdb) next
1393 if (rc == NGX_AGAIN)
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1414 if (noregex == 0 && pclcf->regex_locations)
(gdb) next
1442 return rc;
(gdb) next
1443
(gdb) next
1430 return (rc == NGX_ERROR) ? rc : NGX_OK;location ~* /RgxIgnoreCase.*
没有 "location =" 或者 "location ^~" 的匹配, 查询正则匹配
Breakpoint 1, ngx_http_core_find_location (r=0x7fa04a004e50)
at src/http/ngx_http_core_module.c:1391
1391 rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
(gdb) print r->uri
$56 = len = 21, data = 0x7fa04a000004 "/rgxIGNORECASExx.html HTTP/1.1\\r\\nHost"
(gdb) next
1393 if (rc == NGX_AGAIN)
(gdb) next
1396 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
(gdb) next
1398 noregex = clcf->noregex;
(gdb) next
1403 rc = ngx_http_core_find_location(r);
(gdb) next
Breakpoint 1, ngx_http_core_find_location (r=0x7fa04a004e50)
at src/http/ngx_http_core_module.c:1391
1391 rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
(gdb) next
1393 if (rc == NGX_AGAIN)
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1414 if (noregex == 0 && pclcf->regex_locations)
(gdb) next
1442 return rc;
(gdb) next
1443
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1414 if (noregex == 0 && pclcf->regex_locations)
(gdb) next
1416 for (clcfp = pclcf->regex_locations; *clcfp; clcfp++)
(gdb) next
1421 n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
(gdb) print (*clcfp)->regex->name
$57 = len = 8, data = 0x7fa04801edcb "/regex.*"
(gdb) next
1423 if (n == NGX_OK)
(gdb) next
1433 if (n == NGX_DECLINED)
(gdb) next
1434 continue;
(gdb) next
1416 for (clcfp = pclcf->regex_locations; *clcfp; clcfp++)
(gdb) next
1421 n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
(gdb) print (*clcfp)->regex->name
$58 = len = 16, data = 0x7fa048020334 "/RgxIgnoreCase.*"
(gdb) next
1423 if (n == NGX_OK)
(gdb) next
1424 r->loc_conf = (*clcfp)->loc_conf;
(gdb) next
1428 rc = ngx_http_core_find_location(r);
(gdb) next
Breakpoint 1, ngx_http_core_find_location (r=0x7fa04a004e50)
at src/http/ngx_http_core_module.c:1391
1391 rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
(gdb) next
1393 if (rc == NGX_AGAIN)
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1414 if (noregex == 0 && pclcf->regex_locations)
(gdb) next
1442 return rc;
(gdb) next
1443
(gdb) next
1430 return (rc == NGX_ERROR) ? rc : NGX_OK;location /
找到 "location /" 的匹配, 然后尝试 查询正则匹配
然后 没有找到 合适的正则匹配
最终使用 "location /" 匹配
Breakpoint 1, ngx_http_core_find_location (r=0x7fa04b004e50)
at src/http/ngx_http_core_module.c:1391
1391 rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
(gdb) print r->uri
$59 = len = 11, data = 0x7fa04b000004 "/index.html HTTP/1.1\\r\\nHost"
(gdb) enable 3
(gdb) c
Continuing.
Breakpoint 3, ngx_http_core_find_static_location (r=0x7fa04b004e50,
node=0x7fa048023f10) at src/http/ngx_http_core_module.c:1464
1464 rv = NGX_DECLINED;
(gdb) next
1468 if (node == NULL)
(gdb) next
1476 n = (len <= (size_t) node->len) ? len : node->len;
(gdb) next
1478 rc = ngx_filename_cmp(uri, node->name, n);
(gdb) next
1480 if (rc != 0)
(gdb) next
1486 if (len > (size_t) node->len)
(gdb) next
1488 if (node->inclusive)
(gdb) next
1490 r->loc_conf = node->inclusive->loc_conf;
(gdb) next
1491 rv = NGX_AGAIN;
(gdb) print node->name
$60 = "/"
(gdb) next
1493 node = node->tree;
(gdb) next
1494 uri += n;
(gdb) next
1495 len -= n;
(gdb) next
1497 continue;
(gdb) next
1468 if (node == NULL)
(gdb) next
1476 n = (len <= (size_t) node->len) ? len : node->len;
(gdb) next
1478 rc = ngx_filename_cmp(uri, node->name, n);
(gdb) print node->name
$61 = "a"
(gdb) next
1480 if (rc != 0)
(gdb) next
1481 node = (rc < 0) ? node->left : node->right;
(gdb) next
1483 continue;
(gdb) next
1468 if (node == NULL)
(gdb) next
1476 n = (len <= (size_t) node->len) ? len : node->len;
(gdb) next
1478 rc = ngx_filename_cmp(uri, node->name, n);
(gdb) print node->name
$62 = "e"
(gdb) next
1480 if (rc != 0)
(gdb) next
1481 node = (rc < 0) ? node->left : node->right;
(gdb) next
1483 continue;
(gdb) next
1468 if (node == NULL)
(gdb) next
1469 return rv;
(gdb) next
1530
(gdb) next
ngx_http_core_find_location (r=0x7fa04b004e50) at src/http/ngx_http_core_module.c:1393
1393 if (rc == NGX_AGAIN)
(gdb) next
1396 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
(gdb) next
1398 noregex = clcf->noregex;
(gdb) next
1403 rc = ngx_http_core_find_location(r);
(gdb) next
Breakpoint 1, ngx_http_core_find_location (r=0x7fa04b004e50)
at src/http/ngx_http_core_module.c:1391
1391 rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
(gdb) next
Breakpoint 3, ngx_http_core_find_static_location (r=0x7fa04b004e50, node=0x0)
at src/http/ngx_http_core_module.c:1464
1464 rv = NGX_DECLINED;
(gdb) next
1468 if (node == NULL)
(gdb) next
1469 return rv;
(gdb) next
1530
(gdb) next
ngx_http_core_find_location (r=0x7fa04b004e50) at src/http/ngx_http_core_module.c:1393
1393 if (rc == NGX_AGAIN)
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1414 if (noregex == 0 && pclcf->regex_locations)
(gdb) print noregex
$63 = 0
(gdb) next
1442 return rc;
(gdb) next
1443
(gdb) next
1406 if (rc == NGX_OK || rc == NGX_DONE)
(gdb) next
1414 if (noregex == 0 && pclcf->regex_locations)
(gdb) next
1416 for (clcfp = pclcf->regex_locations; *clcfp; clcfp++)
(gdb) next
1421 n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
(gdb) print (*clcfp)->regex->name
$64 = len = 8, data = 0x7fa04801edcb "/regex.*"
(gdb) next
1423 if (n == NGX_OK)
(gdb) next
1433 if (n == NGX_DECLINED)
(gdb) next
1434 continue;
(gdb) next
1416 for (clcfp = pclcf->regex_locations; *clcfp; clcfp++)
(gdb) next
1421 n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
(gdb) (*clcfp)->regex
Undefined command: "". Try "help".
(gdb) print (*clcfp)->regex->name
$65 = len = 16, data = 0x7fa048020334 "/RgxIgnoreCase.*"
(gdb) next
1423 if (n == NGX_OK)
(gdb) next
1433 if (n == NGX_DECLINED)
(gdb) next
1434 continue;
(gdb) next
1416 for (clcfp = pclcf->regex_locations; *clcfp; clcfp++)
(gdb) next
1439
(gdb) next
1442 return rc;
(gdb) print ((ngx_http_core_loc_conf_t *)r->loc_conf[0])->name
$66 = len = 1, data = 0x7fa04800f7fe "/"
(gdb) print rc
$67 = -5
完
以上是关于02 nginx 中几种 location 表达式的优先级问题的主要内容，如果未能解决你的问题，请参考以下文章
Nginx正则表达式location匹配Rewrite重写详解