• 02 nginx 中几种 location 表达式的优先级问题

    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

    1. location /api       // 前缀匹配1
    2. location = /api     // 精确匹配
    3. location ^~ /api    // 前缀匹配2
    4. location ~ /api     // 正则匹配
    5. 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 

    1.     server {
    2.         listen       80;
    3.         server_name  localhost;
    4.  
    5.         #charset koi8-r;
    6.  
    7.         #access_log  logs/host.access.log  main;
    8.  
    9.         location / {
    10.             root   html;
    11.             index  index.html index.htm;
    12.         }
    13.  
    14.         #error_page  404              /404.html;
    15.  
    16.         # redirect server error pages to the static page /50x.html
    17.         #
    18.         error_page   500 502 503 504  /50x.html;
    19.         location = /50x.html {
    20.             root   html;
    21.         }
    22.  
    23.         location ^~ /api/ {
    24.                root html; 
    25.                index  index.html index.htm;
    26.                proxy_pass http://localhost:8080/;
    27.         }
    28.  
    29.         location = /exactly.html {
    30.                root html/exactly;
    31.                index  index.html index.htm;
    32.         }
    33.  
    34.         location ^~ /exactly.html {
    35.                root html/exactly;
    36.                index  index.html index.htm;
    37.         }
    38.  
    39.         location ~ /regex.* {
    40.                root html/regex;
    41.                index  index.html index.htm;
    42.         }
    43.  
    44.         location ~* /RgxIgnoreCase.* {
    45.                root html/regexIgnoreCase;
    46.                index  index.html index.htm;
    47.         }
    48.  
    49.     }

    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 

    1. # pclcf->static_locations 的 pattern 树如下
    2. / -> null, "/api/", null
    3. "/api/" -> "/50x.html", null, "/exactly.html"
    4.  
    5. (gdb) print pclcf->static_locations
    6. $16 = (ngx_http_location_tree_node_t *) 0x7fa048023f10
    7. (gdb) print pclcf->static_locations->name
    8. $17 = "/"
    9. (gdb) print pclcf->static_locations->left
    10. $18 = (ngx_http_location_tree_node_t *) 0x0
    11. (gdb) print pclcf->static_locations->tree
    12. $19 = (ngx_http_location_tree_node_t *) 0x7fa048023f40
    13. (gdb) print pclcf->static_locations->right
    14. $20 = (ngx_http_location_tree_node_t *) 0x0
    15.  
    16. (gdb) print pclcf->static_locations->tree->name
    17. $21 = "a"
    18. (gdb) print pclcf->static_locations->tree->left
    19. $22 = (ngx_http_location_tree_node_t *) 0x7fa048023f70
    20. (gdb) print pclcf->static_locations->tree->tree
    21. $23 = (ngx_http_location_tree_node_t *) 0x0
    22. (gdb) print pclcf->static_locations->tree->right
    23. $24 = (ngx_http_location_tree_node_t *) 0x7fa048023fa8
    24.  
    25. (gdb) print pclcf->static_locations->tree->left->name
    26. $25 = "5"
    27. (gdb) print pclcf->static_locations->tree->left->left
    28. $26 = (ngx_http_location_tree_node_t *) 0x0
    29. (gdb) print pclcf->static_locations->tree->left->tree
    30. $27 = (ngx_http_location_tree_node_t *) 0x0
    31. (gdb) print pclcf->static_locations->tree->left->right
    32. $28 = (ngx_http_location_tree_node_t *) 0x0
    33.  
    34. (gdb) print pclcf->static_locations->tree->right->name
    35. $29 = "e"
    36. (gdb) print pclcf->static_locations->tree->right->left
    37. $30 = (ngx_http_location_tree_node_t *) 0x0
    38. (gdb) print pclcf->static_locations->tree->right->tree
    39. $31 = (ngx_http_location_tree_node_t *) 0x0
    40. (gdb) print pclcf->static_locations->tree->right->right
    41. $32 = (ngx_http_location_tree_node_t *) 0x0
    42.  
    43.  
    44.  
    45.  
    46. (gdb) print pclcf->static_locations->exactly->name
    47. There is no member named exactly.
    48. (gdb) print pclcf->static_locations->inclusive->name
    49. $33 = {len = 1, data = 0x7fa04800f7fe "/"}
    50. (gdb) print pclcf->static_locations->exact->name
    51. Cannot access memory at address 0x0
    52. (gdb) print pclcf->static_locations->tree->exact->name
    53. Cannot access memory at address 0x0
    54. (gdb) print pclcf->static_locations->tree->inclusive->name
    55. $34 = {len = 5, data = 0x7fa048007a94 "/api/"}
    56. (gdb) print pclcf->static_locations->tree->left->exact->name
    57. $35 = {len = 9, data = 0x7fa048006653 "/50x.html"}
    58. (gdb) print pclcf->static_locations->tree->left->inclusive->name
    59. Cannot access memory at address 0x0
    60. (gdb) print pclcf->static_locations->tree->right->exact->name
    61. $36 = {len = 13, data = 0x7fa048008feb "/exactly.html"}
    62. (gdb) print pclcf->static_locations->tree->right->inclusive->name
    63. $37 = {len = 13, data = 0x7fa04801d8ec "/exactly.html"}
    64.

    location = /exactly.html 

    1. Breakpoint 2, ngx_http_core_find_static_location (r=0x7fa049800050, 
    2.     node=0x7fa048023fa8) at src/http/ngx_http_core_module.c:1509
    3. 1509	            if (node->exact) {
    4. (gdb) print node
    5. $38 = (ngx_http_location_tree_node_t *) 0x7fa048023fa8
    6. (gdb) print node->exact->name
    7. $39 = {len = 13, data = 0x7fa048008feb "/exactly.html"}
    8. (gdb) print r.uri
    9. $40 = {len = 13, data = 0x7fa04b800004 "/exactly.html HTTP/1.1\r\nHost"}
    10. (gdb) next
    11. 1510	
    12. (gdb) next
    13. 1511	
    14. (gdb) next
    15. 1530	
    16. (gdb) next
    17. ngx_http_core_find_location (r=0x7fa049800050) at src/http/ngx_http_core_module.c:1393
    18. 1393	    if (rc == NGX_AGAIN) {
    19. (gdb) next
    20. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    21. (gdb) next
    22. 1407	        return rc;
    23. (gdb) bt
    24. #0  ngx_http_core_find_location (r=0x7fa049800050)
    25.     at src/http/ngx_http_core_module.c:1407
    26. #1  0x0000000107d22f03 in ngx_http_core_find_config_phase (r=0x7fa049800050, 
    27.     ph=0x7fa048025258) at src/http/ngx_http_core_module.c:953
    28. #2  0x0000000107d22d3e in ngx_http_core_run_phases (r=0x7fa049800050)
    29.     at src/http/ngx_http_core_module.c:868
    30. #3  0x0000000107d22cae in ngx_http_handler (r=0x7fa049800050)
    31.     at src/http/ngx_http_core_module.c:851
    32. #4  0x0000000107d31f36 in ngx_http_process_request (r=0x7fa049800050)
    33.     at src/http/ngx_http_request.c:2060
    34. #5  0x0000000107d3407a in ngx_http_process_request_headers (rev=0x107ee40d0)
    35.     at src/http/ngx_http_request.c:1480
    36. #6  0x0000000107d33415 in ngx_http_process_request_line (rev=0x107ee40d0)
    37.     at src/http/ngx_http_request.c:1151
    38. #7  0x0000000107d35979 in ngx_http_keepalive_handler (rev=0x107ee40d0)
    39.     at src/http/ngx_http_request.c:3333
    40. #8  0x0000000107d1cc10 in ngx_kqueue_process_events (cycle=0x7fa048800c50, 
    41.     timer=55093, flags=1) at src/event/modules/ngx_kqueue_module.c:669
    42. #9  0x0000000107d0c9f6 in ngx_process_events_and_timers (cycle=0x7fa048800c50)
    43.     at src/event/ngx_event.c:247
    44. #10 0x0000000107d1aac5 in ngx_worker_process_cycle (cycle=0x7fa048800c50, data=0x0)
    45.     at src/os/unix/ngx_process_cycle.c:750
    46. #11 0x0000000107d17cfa in ngx_spawn_process (cycle=0x7fa048800c50, 
    47.     proc=0x107d1aa10 <ngx_worker_process_cycle>, data=0x0, 
    48.     name=0x107de2a1e "worker process", respawn=-3) at src/os/unix/ngx_process.c:199
    49. #12 0x0000000107d19be7 in ngx_start_worker_processes (cycle=0x7fa048800c50, n=1, 
    50.     type=-3) at src/os/unix/ngx_process_cycle.c:359
    51. #13 0x0000000107d19558 in ngx_master_process_cycle (cycle=0x7fa048800c50)
    52.     at src/os/unix/ngx_process_cycle.c:131
    53. #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 

    1. Breakpoint 3, ngx_http_core_find_static_location (r=0x7fa049804c50, 
    2.     node=0x7fa048023f10) at src/http/ngx_http_core_module.c:1464
    3. (gdb) print r->uri
    4. $47 = {len = 37, 
    5.   data = 0x7fa049800004 "/api/HelloWorld/listFormWithoutHeader HTTP/1.1\r\nHost"}
    6. 1464	    rv = NGX_DECLINED;
    7. (gdb) next
    8. 1468	        if (node == NULL) {
    9. (gdb) next
    10. 1476	        n = (len <= (size_t) node->len) ? len : node->len;
    11. (gdb) print node->name
    12. $44 = "/"
    13. (gdb) next
    14. 1478	        rc = ngx_filename_cmp(uri, node->name, n);
    15. (gdb) next
    16. 1480	        if (rc != 0) {
    17. (gdb) next
    18. 1486	        if (len > (size_t) node->len) {
    19. (gdb) next
    20. 1488	            if (node->inclusive) {
    21. (gdb) next
    22. 1490	                r->loc_conf = node->inclusive->loc_conf;
    23. (gdb) next
    24. 1491	                rv = NGX_AGAIN;
    25. (gdb) next
    26. 1493	                node = node->tree;
    27. (gdb) next
    28. 1494	                uri += n;
    29. (gdb) next
    30. 1495	                len -= n;
    31. (gdb) next
    32. 1497	                continue;
    33. (gdb) next
    34. 1468	        if (node == NULL) {
    35. (gdb) next
    36. 1476	        n = (len <= (size_t) node->len) ? len : node->len;
    37. (gdb) print node->name
    38. $45 = "a"
    39. (gdb) next
    40. 1478	        rc = ngx_filename_cmp(uri, node->name, n);
    41. (gdb) next
    42. 1480	        if (rc != 0) {
    43. (gdb) next
    44. 1486	        if (len > (size_t) node->len) {
    45. (gdb) next
    46. 1488	            if (node->inclusive) {
    47. (gdb) next
    48. 1490	                r->loc_conf = node->inclusive->loc_conf;
    49. (gdb) next
    50. 1491	                rv = NGX_AGAIN;
    51. (gdb) next
    52. 1493	                node = node->tree;
    53. (gdb) next
    54. 1494	                uri += n;
    55. (gdb) next
    56. 1495	                len -= n;
    57. (gdb) next
    58. 1497	                continue;
    59. (gdb) next
    60. 1468	        if (node == NULL) {
    61. (gdb) next
    62. 1469	            return rv;
    63. (gdb) next
    64. 1530	
    65. (gdb) next
    66. ngx_http_core_find_location (r=0x7fa049804c50) at src/http/ngx_http_core_module.c:1393
    67. 1393	    if (rc == NGX_AGAIN) {
    68. (gdb) next
    69. 1396	        clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
    70. (gdb) next
    71. 1398	        noregex = clcf->noregex;
    72. (gdb) next
    73. 1403	        rc = ngx_http_core_find_location(r);
    74. (gdb) print noregex
    75. $46 = 1
    76. (gdb) next
    77.  
    78. Breakpoint 3, ngx_http_core_find_static_location (r=0x7fa049804c50, node=0x0)
    79.     at src/http/ngx_http_core_module.c:1464
    80. 1464	    rv = NGX_DECLINED;
    81. (gdb) next
    82. 1468	        if (node == NULL) {
    83. (gdb) next
    84. 1469	            return rv;
    85. (gdb) next
    86. 1530	
    87. (gdb) next
    88. ngx_http_core_find_location (r=0x7fa049804c50) at src/http/ngx_http_core_module.c:1393
    89. 1393	    if (rc == NGX_AGAIN) {
    90. (gdb) next
    91. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    92. (gdb) next
    93. 1414	    if (noregex == 0 && pclcf->regex_locations) {
    94. (gdb) next
    95. 1442	    return rc;
    96. (gdb) bt
    97. #0  ngx_http_core_find_location (r=0x7fa049804c50)
    98.     at src/http/ngx_http_core_module.c:1442
    99. #1  0x0000000107d23366 in ngx_http_core_find_location (r=0x7fa049804c50)
    100.     at src/http/ngx_http_core_module.c:1403
    101. #2  0x0000000107d22f03 in ngx_http_core_find_config_phase (r=0x7fa049804c50, 
    102.     ph=0x7fa048025258) at src/http/ngx_http_core_module.c:953
    103. #3  0x0000000107d22d3e in ngx_http_core_run_phases (r=0x7fa049804c50)
    104.     at src/http/ngx_http_core_module.c:868
    105. #4  0x0000000107d22cae in ngx_http_handler (r=0x7fa049804c50)
    106.     at src/http/ngx_http_core_module.c:851
    107. #5  0x0000000107d31f36 in ngx_http_process_request (r=0x7fa049804c50)
    108.     at src/http/ngx_http_request.c:2060
    109. #6  0x0000000107d3407a in ngx_http_process_request_headers (rev=0x107ee40d0)
    110.     at src/http/ngx_http_request.c:1480
    111. #7  0x0000000107d33415 in ngx_http_process_request_line (rev=0x107ee40d0)
    112.     at src/http/ngx_http_request.c:1151
    113. #8  0x0000000107d3076d in ngx_http_wait_request_handler (rev=0x107ee40d0)
    114.     at src/http/ngx_http_request.c:500
    115. #9  0x0000000107d1cc10 in ngx_kqueue_process_events (cycle=0x7fa048800c50, 
    116.     timer=59999, flags=1) at src/event/modules/ngx_kqueue_module.c:669
    117. #10 0x0000000107d0c9f6 in ngx_process_events_and_timers (cycle=0x7fa048800c50)
    118.     at src/event/ngx_event.c:247
    119. #11 0x0000000107d1aac5 in ngx_worker_process_cycle (cycle=0x7fa048800c50, data=0x0)
    120.     at src/os/unix/ngx_process_cycle.c:750
    121. #12 0x0000000107d17cfa in ngx_spawn_process (cycle=0x7fa048800c50, 
    122.     proc=0x107d1aa10 <ngx_worker_process_cycle>, data=0x0, 
    123.     name=0x107de2a1e "worker process", respawn=-3) at src/os/unix/ngx_process.c:199
    124. #13 0x0000000107d19be7 in ngx_start_worker_processes (cycle=0x7fa048800c50, n=1, 
    125.     type=-3) at src/os/unix/ngx_process_cycle.c:359
    126. #14 0x0000000107d19558 in ngx_master_process_cycle (cycle=0x7fa048800c50)
    127.     at src/os/unix/ngx_process_cycle.c:131
    128. #15 0x0000000107cd18ba in main (argc=3, argv=0x7ffee7f2f548) at src/core/nginx.c:382
    129. (gdb)

    location ~ /regex.* 

    没有 "location =" 或者 "location ^~" 的匹配, 查询正则匹配 

    1. Breakpoint 1, ngx_http_core_find_location (r=0x7fa04800f850)
    2.     at src/http/ngx_http_core_module.c:1391
    3. 1391	    rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
    4. (gdb) next
    5. 1393	    if (rc == NGX_AGAIN) {
    6. (gdb) next
    7. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    8. (gdb) next
    9. 1414	    if (noregex == 0 && pclcf->regex_locations) {
    10. (gdb) next
    11. 1442	    return rc;
    12. (gdb) next
    13. 1443	}
    14. (gdb) next
    15. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    16. (gdb) next
    17. 1414	    if (noregex == 0 && pclcf->regex_locations) {
    18. (gdb) next
    19. 1416	        for (clcfp = pclcf->regex_locations; *clcfp; clcfp++) {
    20. (gdb) next
    21. 1421	            n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
    22. (gdb) print (*clcfp)->regex
    23. $54 = (ngx_http_regex_t *) 0x7fa048020248
    24. (gdb) print (*clcfp)->regex->pattern
    25. There is no member named pattern.
    26. (gdb) print (*clcfp)->regex->name
    27. $55 = {len = 8, data = 0x7fa04801edcb "/regex.*"}
    28. (gdb) next
    29. 1423	            if (n == NGX_OK) {
    30. (gdb) next
    31. 1424	                r->loc_conf = (*clcfp)->loc_conf;
    32. (gdb) next
    33. 1428	                rc = ngx_http_core_find_location(r);
    34. (gdb) next
    35.  
    36. Breakpoint 1, ngx_http_core_find_location (r=0x7fa04800f850)
    37.     at src/http/ngx_http_core_module.c:1391
    38. 1391	    rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
    39. (gdb) next
    40. 1393	    if (rc == NGX_AGAIN) {
    41. (gdb) next
    42. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    43. (gdb) next
    44. 1414	    if (noregex == 0 && pclcf->regex_locations) {
    45. (gdb) next
    46. 1442	    return rc;
    47. (gdb) next
    48. 1443	}
    49. (gdb) next
    50. 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 

    1. Breakpoint 1, ngx_http_core_find_location (r=0x7fa04a004e50)
    2.     at src/http/ngx_http_core_module.c:1391
    3. 1391	    rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
    4. (gdb) print r->uri
    5. $56 = {len = 21, data = 0x7fa04a000004 "/rgxIGNORECASExx.html HTTP/1.1\r\nHost"}
    6. (gdb) next
    7. 1393	    if (rc == NGX_AGAIN) {
    8. (gdb) next
    9. 1396	        clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
    10. (gdb) next
    11. 1398	        noregex = clcf->noregex;
    12. (gdb) next
    13. 1403	        rc = ngx_http_core_find_location(r);
    14. (gdb) next
    15.  
    16. Breakpoint 1, ngx_http_core_find_location (r=0x7fa04a004e50)
    17.     at src/http/ngx_http_core_module.c:1391
    18. 1391	    rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
    19. (gdb) next
    20. 1393	    if (rc == NGX_AGAIN) {
    21. (gdb) next
    22. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    23. (gdb) next
    24. 1414	    if (noregex == 0 && pclcf->regex_locations) {
    25. (gdb) next
    26. 1442	    return rc;
    27. (gdb) next
    28. 1443	}
    29. (gdb) next
    30. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    31. (gdb) next
    32. 1414	    if (noregex == 0 && pclcf->regex_locations) {
    33. (gdb) next
    34. 1416	        for (clcfp = pclcf->regex_locations; *clcfp; clcfp++) {
    35. (gdb) next
    36. 1421	            n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
    37. (gdb) print (*clcfp)->regex->name
    38. $57 = {len = 8, data = 0x7fa04801edcb "/regex.*"}
    39. (gdb) next
    40. 1423	            if (n == NGX_OK) {
    41. (gdb) next
    42. 1433	            if (n == NGX_DECLINED) {
    43. (gdb) next
    44. 1434	                continue;
    45. (gdb) next
    46. 1416	        for (clcfp = pclcf->regex_locations; *clcfp; clcfp++) {
    47. (gdb) next
    48. 1421	            n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
    49. (gdb) print (*clcfp)->regex->name
    50. $58 = {len = 16, data = 0x7fa048020334 "/RgxIgnoreCase.*"}
    51. (gdb) next
    52. 1423	            if (n == NGX_OK) {
    53. (gdb) next
    54. 1424	                r->loc_conf = (*clcfp)->loc_conf;
    55. (gdb) next
    56. 1428	                rc = ngx_http_core_find_location(r);
    57. (gdb) next
    58.  
    59. Breakpoint 1, ngx_http_core_find_location (r=0x7fa04a004e50)
    60.     at src/http/ngx_http_core_module.c:1391
    61. 1391	    rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
    62. (gdb) next
    63. 1393	    if (rc == NGX_AGAIN) {
    64. (gdb) next
    65. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    66. (gdb) next
    67. 1414	    if (noregex == 0 && pclcf->regex_locations) {
    68. (gdb) next
    69. 1442	    return rc;
    70. (gdb) next
    71. 1443	}
    72. (gdb) next
    73. 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 

    1. Breakpoint 1, ngx_http_core_find_location (r=0x7fa04b004e50)
    2.     at src/http/ngx_http_core_module.c:1391
    3. 1391	    rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
    4. (gdb) print r->uri
    5. $59 = {len = 11, data = 0x7fa04b000004 "/index.html HTTP/1.1\r\nHost"}
    6. (gdb) enable 3
    7. (gdb) c
    8. Continuing.
    9.  
    10. Breakpoint 3, ngx_http_core_find_static_location (r=0x7fa04b004e50, 
    11.     node=0x7fa048023f10) at src/http/ngx_http_core_module.c:1464
    12. 1464	    rv = NGX_DECLINED;
    13. (gdb) next
    14. 1468	        if (node == NULL) {
    15. (gdb) next
    16. 1476	        n = (len <= (size_t) node->len) ? len : node->len;
    17. (gdb) next
    18. 1478	        rc = ngx_filename_cmp(uri, node->name, n);
    19. (gdb) next
    20. 1480	        if (rc != 0) {
    21. (gdb) next
    22. 1486	        if (len > (size_t) node->len) {
    23. (gdb) next
    24. 1488	            if (node->inclusive) {
    25. (gdb) next
    26. 1490	                r->loc_conf = node->inclusive->loc_conf;
    27. (gdb) next
    28. 1491	                rv = NGX_AGAIN;
    29. (gdb) print node->name
    30. $60 = "/"
    31. (gdb) next
    32. 1493	                node = node->tree;
    33. (gdb) next
    34. 1494	                uri += n;
    35. (gdb) next
    36. 1495	                len -= n;
    37. (gdb) next
    38. 1497	                continue;
    39. (gdb) next
    40. 1468	        if (node == NULL) {
    41. (gdb) next
    42. 1476	        n = (len <= (size_t) node->len) ? len : node->len;
    43. (gdb) next
    44. 1478	        rc = ngx_filename_cmp(uri, node->name, n);
    45. (gdb) print node->name
    46. $61 = "a"
    47. (gdb) next
    48. 1480	        if (rc != 0) {
    49. (gdb) next
    50. 1481	            node = (rc < 0) ? node->left : node->right;
    51. (gdb) next
    52. 1483	            continue;
    53. (gdb) next
    54. 1468	        if (node == NULL) {
    55. (gdb) next
    56. 1476	        n = (len <= (size_t) node->len) ? len : node->len;
    57. (gdb) next
    58. 1478	        rc = ngx_filename_cmp(uri, node->name, n);
    59. (gdb) print node->name
    60. $62 = "e"
    61. (gdb) next
    62. 1480	        if (rc != 0) {
    63. (gdb) next
    64. 1481	            node = (rc < 0) ? node->left : node->right;
    65. (gdb) next
    66. 1483	            continue;
    67. (gdb) next
    68. 1468	        if (node == NULL) {
    69. (gdb) next
    70. 1469	            return rv;
    71. (gdb) next
    72. 1530	
    73. (gdb) next
    74. ngx_http_core_find_location (r=0x7fa04b004e50) at src/http/ngx_http_core_module.c:1393
    75. 1393	    if (rc == NGX_AGAIN) {
    76. (gdb) next
    77. 1396	        clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
    78. (gdb) next
    79. 1398	        noregex = clcf->noregex;
    80. (gdb) next
    81. 1403	        rc = ngx_http_core_find_location(r);
    82. (gdb) next
    83.  
    84. Breakpoint 1, ngx_http_core_find_location (r=0x7fa04b004e50)
    85.     at src/http/ngx_http_core_module.c:1391
    86. 1391	    rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
    87. (gdb) next
    88.  
    89. Breakpoint 3, ngx_http_core_find_static_location (r=0x7fa04b004e50, node=0x0)
    90.     at src/http/ngx_http_core_module.c:1464
    91. 1464	    rv = NGX_DECLINED;
    92. (gdb) next
    93. 1468	        if (node == NULL) {
    94. (gdb) next
    95. 1469	            return rv;
    96. (gdb) next
    97. 1530	
    98. (gdb) next
    99. ngx_http_core_find_location (r=0x7fa04b004e50) at src/http/ngx_http_core_module.c:1393
    100. 1393	    if (rc == NGX_AGAIN) {
    101. (gdb) next
    102. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    103. (gdb) next
    104. 1414	    if (noregex == 0 && pclcf->regex_locations) {
    105. (gdb) print noregex
    106. $63 = 0
    107. (gdb) next
    108. 1442	    return rc;
    109. (gdb) next
    110. 1443	}
    111. (gdb) next
    112. 1406	    if (rc == NGX_OK || rc == NGX_DONE) {
    113. (gdb) next
    114. 1414	    if (noregex == 0 && pclcf->regex_locations) {
    115. (gdb) next
    116. 1416	        for (clcfp = pclcf->regex_locations; *clcfp; clcfp++) {
    117. (gdb) next
    118. 1421	            n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
    119. (gdb) print (*clcfp)->regex->name
    120. $64 = {len = 8, data = 0x7fa04801edcb "/regex.*"}
    121. (gdb) next
    122. 1423	            if (n == NGX_OK) {
    123. (gdb) next
    124. 1433	            if (n == NGX_DECLINED) {
    125. (gdb) next
    126. 1434	                continue;
    127. (gdb) next
    128. 1416	        for (clcfp = pclcf->regex_locations; *clcfp; clcfp++) {
    129. (gdb) next
    130. 1421	            n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
    131. (gdb) (*clcfp)->regex
    132. Undefined command: "".  Try "help".
    133. (gdb) print (*clcfp)->regex->name
    134. $65 = {len = 16, data = 0x7fa048020334 "/RgxIgnoreCase.*"}
    135. (gdb) next
    136. 1423	            if (n == NGX_OK) {
    137. (gdb) next
    138. 1433	            if (n == NGX_DECLINED) {
    139. (gdb) next
    140. 1434	                continue;
    141. (gdb) next
    142. 1416	        for (clcfp = pclcf->regex_locations; *clcfp; clcfp++) {
    143. (gdb) next
    144. 1439	    }
    145. (gdb) next
    146. 1442	    return rc;
    147. (gdb) print ((ngx_http_core_loc_conf_t  *)r->loc_conf[0])->name
    148. $66 = {len = 1, data = 0x7fa04800f7fe "/"}
    149. (gdb) print rc
    150. $67 = -5

    完

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  • 原文地址：https://blog.csdn.net/u011039332/article/details/125467695