static ngx_int_t
ngx_http_index_test_dir(ngx_http_request_t *r, ngx_http_core_loc_conf_t *clcf,
    u_char *path, u_char *last)
{
    u_char                c;
    ngx_str_t             dir;
    ngx_open_file_info_t  of;

    c = *last;
    if (c != '/' || path == last) {
        /* "alias" without trailing slash */
        c = *(++last);
    }
    *last = '\0';

    dir.len = last - path;
    dir.data = path;

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http index check dir: \"%V\"", &dir);

    ngx_memzero(&of, sizeof(ngx_open_file_info_t));

    of.test_dir = 1;
    of.test_only = 1;
    of.valid = clcf->open_file_cache_valid;
    of.errors = clcf->open_file_cache_errors;

    if (ngx_http_set_disable_symlinks(r, clcf, &dir, &of) != NGX_OK) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    if (ngx_open_cached_file(clcf->open_file_cache, &dir, &of, r->pool)
        != NGX_OK)
    {
        if (of.err) {

#if (NGX_HAVE_OPENAT)
            if (of.err == NGX_EMLINK
                || of.err == NGX_ELOOP)
            {
                return NGX_HTTP_FORBIDDEN;
            }
#endif

            if (of.err == NGX_ENOENT) {
                *last = c;
                return ngx_http_index_error(r, clcf, dir.data, NGX_ENOENT);
            }

            if (of.err == NGX_EACCES) {

                *last = c;

                /*
                 * ngx_http_index_test_dir() is called after the first index
                 * file testing has returned an error distinct from NGX_EACCES.
                 * This means that directory searching is allowed.
                 */

                return NGX_OK;
            }

            ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err,
                          "%s \"%s\" failed", of.failed, dir.data);
        }

        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    *last = c;

    if (of.is_dir) {
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
                  "\"%s\" is not a directory", dir.data);

    return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/*  配置index index.html index_large.html  gmime-gmime-cipher-context.html;
2025/02/14 08:24:04[   ngx_http_process_request_headers,  1412]  [debug] 2955#2955: *2 http header done
2025/02/14 08:24:04[                ngx_event_del_timer,    39]  [debug] 2955#2955: *2 < ngx_http_process_request,  2013>  event timer del: 3: 30909486
2025/02/14 08:24:04[        ngx_http_core_rewrite_phase,  1810]  [debug] 2955#2955: *2 rewrite phase: 0 (NGX_HTTP_SERVER_REWRITE_PHASE)
2025/02/14 08:24:04[    ngx_http_core_find_config_phase,  1868]  [debug] 2955#2955: *2 find config phase: 1 (NGX_HTTP_FIND_CONFIG_PHASE), uri:/
2025/02/14 08:24:04[ ngx_http_core_find_static_location,  2753]  [debug] 2955#2955: *2 static_locations test location: "/", client uri:/
2025/02/14 08:24:04[        ngx_http_core_find_location,  2693]  [debug] 2955#2955: *2 ngx pcre test location: ~ "/1mytest"
2025/02/14 08:24:04[    ngx_http_core_find_config_phase,  1888]  [debug] 2955#2955: *2 using configuration "/"
2025/02/14 08:24:04[    ngx_http_core_find_config_phase,  1895]  [debug] 2955#2955: *2 http cl:-1 max:1048576
2025/02/14 08:24:04[        ngx_http_core_rewrite_phase,  1810]  [debug] 2955#2955: *2 rewrite phase: 2 (NGX_HTTP_REWRITE_PHASE)
2025/02/14 08:24:04[   ngx_http_core_post_rewrite_phase,  1963]  [debug] 2955#2955: *2 post rewrite phase: 3 (NGX_HTTP_POST_REWRITE_PHASE)
2025/02/14 08:24:04[        ngx_http_core_generic_phase,  1746]  [debug] 2955#2955: *2 generic phase: 4 (NGX_HTTP_PREACCESS_PHASE)
2025/02/14 08:24:04[        ngx_http_core_generic_phase,  1746]  [debug] 2955#2955: *2 generic phase: 5 (NGX_HTTP_PREACCESS_PHASE)
2025/02/14 08:24:04[         ngx_http_core_access_phase,  2061]  [debug] 2955#2955: *2 access phase: 6 (NGX_HTTP_ACCESS_PHASE)
2025/02/14 08:24:04[         ngx_http_core_access_phase,  2061]  [debug] 2955#2955: *2 access phase: 7 (NGX_HTTP_ACCESS_PHASE)
2025/02/14 08:24:04[    ngx_http_core_post_access_phase,  2163]  [debug] 2955#2955: *2 post access phase: 8 (NGX_HTTP_POST_ACCESS_PHASE)
2025/02/14 08:24:04[        ngx_http_core_content_phase,  2491]  [debug] 2955#2955: *2 content phase: 9 (NGX_HTTP_CONTENT_PHASE)
2025/02/14 08:24:04[             ngx_http_index_handler,   144]  [debug] 2955#2955: *2 yang test ... index-count:3
2025/02/14 08:24:04[             ngx_http_index_handler,   216]  [debug] 2955#2955: *2 open index "/usr/local/nginx/html/index.html"
2025/02/14 08:24:04[         ngx_http_internal_redirect,  3853]  [debug] 2955#2955: *2 internal redirect: "/index.html?"
2025/02/14 08:24:04[        ngx_http_core_rewrite_phase,  1810]  [debug] 2955#2955: *2 rewrite phase: 0 (NGX_HTTP_SERVER_REWRITE_PHASE)
2025/02/14 08:24:04[    ngx_http_core_find_config_phase,  1868]  [debug] 2955#2955: *2 find config phase: 1 (NGX_HTTP_FIND_CONFIG_PHASE), uri:/index.html
2025/02/14 08:24:04[ ngx_http_core_find_static_location,  2753]  [debug] 2955#2955: *2 static_locations test location: "/", client uri:/index.html
2025/02/14 08:24:04[ ngx_http_core_find_static_location,  2753]  [debug] 2955#2955: *2 static_locations test location: "proxy1", client uri:/index.html
2025/02/14 08:24:04[ ngx_http_core_find_static_location,  2753]  [debug] 2955#2955: *2 static_locations test location: "mytest", client uri:/index.html
2025/02/14 08:24:04[        ngx_http_core_find_location,  2693]  [debug] 2955#2955: *2 ngx pcre test location: ~ "/1mytest"
2025/02/14 08:24:04[    ngx_http_core_find_config_phase,  1888]  [debug] 2955#2955: *2 using configuration "/"
2025/02/14 08:24:04[    ngx_http_core_find_config_phase,  1895]  [debug] 2955#2955: *2 http cl:-1 max:1048576
2025/02/14 08:24:04[        ngx_http_core_rewrite_phase,  1810]  [debug] 2955#2955: *2 rewrite phase: 2 (NGX_HTTP_REWRITE_PHASE)
2025/02/14 08:24:04[   ngx_http_core_post_rewrite_phase,  1963]  [debug] 2955#2955: *2 post rewrite phase: 3 (NGX_HTTP_POST_REWRITE_PHASE)
2025/02/14 08:24:04[        ngx_http_core_generic_phase,  1746]  [debug] 2955#2955: *2 generic phase: 4 (NGX_HTTP_PREACCESS_PHASE)
2025/02/14 08:24:04[        ngx_http_core_generic_phase,  1746]  [debug] 2955#2955: *2 generic phase: 5 (NGX_HTTP_PREACCESS_PHASE)
2025/02/14 08:24:04[         ngx_http_core_access_phase,  2061]  [debug] 2955#2955: *2 access phase: 6 (NGX_HTTP_ACCESS_PHASE)
2025/02/14 08:24:04[         ngx_http_core_access_phase,  2061]  [debug] 2955#2955: *2 access phase: 7 (NGX_HTTP_ACCESS_PHASE)
2025/02/14 08:24:04[    ngx_http_core_post_access_phase,  2163]  [debug] 2955#2955: *2 post access phase: 8 (NGX_HTTP_POST_ACCESS_PHASE)
2025/02/14 08:24:04[        ngx_http_core_content_phase,  2491]  [debug] 2955#2955: *2 content phase: 9 (NGX_HTTP_CONTENT_PHASE)
2025/02/14 08:24:04[        ngx_http_core_content_phase,  2491]  [debug] 2955#2955: *2 content phase: 10 (NGX_HTTP_CONTENT_PHASE)
2025/02/14 08:24:04[        ngx_http_core_content_phase,  2491]  [debug] 2955#2955: *2 content phase: 11 (NGX_HTTP_CONTENT_PHASE)
2025/02/14 08:24:04[            ngx_http_static_handler,    85]  [debug] 2955#2955: *2 http filename: "/usr/local/nginx/html/index.html"
2025/02/14 08:24:04[            ngx_http_static_handler,   145]  [debug] 2955#2955: *2 http static fd: 11
2025/02/14 08:24:04[      ngx_http_discard_request_body,   734]  [debug] 2955#2955: *2 http set discard body
*/
static ngx_int_t //主要功能是检查uri中的文件是否存在,不存在直接关闭连接,存在则做内部重定向,重定向后由于是文件路径,因此末尾没有/,走到该函数直接退出,然后在static-module中获取文件内容
ngx_http_index_handler(ngx_http_request_t *r)
{//注意:ngx_http_static_handler如果uri不是以/结尾返回,ngx_http_index_handler不以/结尾返回
//循环遍历index index.html index_large.html  gmime-gmime-cipher-context.html;配置的文件,存在则返回,找到一个不在遍历后面的文件
//ngx_http_static_handler ngx_http_index_handler每次都要获取缓存信息stat信息,因此每次获取很可能是上一次stat执行的时候获取的信息,除非缓存过期

    u_char                       *p, *name;
    size_t                        len, root, reserve, allocated;
    ngx_int_t                     rc;
    ngx_str_t                     path, uri;
    ngx_uint_t                    i, dir_tested;
    ngx_http_index_t             *index;
    ngx_open_file_info_t          of;
    ngx_http_script_code_pt       code;
    ngx_http_script_engine_t      e;
    ngx_http_core_loc_conf_t     *clcf;
    ngx_http_index_loc_conf_t    *ilcf;
    ngx_http_script_len_code_pt   lcode;

    /*
      一般匹配到location / {
    
      }的时候,才会执行下面的index,然后进行内部跳转
     */

    /*
    如果浏览器输入:http://10.135.10.167/ABC/,则也会满足要求,uri会变为/ABC/index.html,打印如下
     2015/10/16 12:08:03[                ngx_event_del_timer,    39]  [debug] 12610#12610: *2 < ngx_http_process_request,  2013>  event timer del: 3: 1859492499
     2015/10/16 12:08:03[        ngx_http_core_rewrite_phase,  1810]  [debug] 12610#12610: *2 rewrite phase: 0 (NGX_HTTP_SERVER_REWRITE_PHASE)
     2015/10/16 12:08:03[    ngx_http_core_find_config_phase,  1868]  [debug] 12610#12610: *2 find config phase: 1 (NGX_HTTP_FIND_CONFIG_PHASE), uri:/ABC/
     2015/10/16 12:08:03[ ngx_http_core_find_static_location,  2753]  [debug] 12610#12610: *2 static_locations test location: "/", client uri:/ABC/
     2015/10/16 12:08:03[ ngx_http_core_find_static_location,  2753]  [debug] 12610#12610: *2 static_locations test location: "proxy1", client uri:/ABC/
     2015/10/16 12:08:03[ ngx_http_core_find_static_location,  2753]  [debug] 12610#12610: *2 static_locations test location: "mytest", client uri:/ABC/
     2015/10/16 12:08:03[        ngx_http_core_find_location,  2693]  [debug] 12610#12610: *2 ngx pcre test location: ~ "\.php$"
     2015/10/16 12:08:03[        ngx_http_core_find_location,  2693]  [debug] 12610#12610: *2 ngx pcre test location: ~ "/1mytest"
     2015/10/16 12:08:03[    ngx_http_core_find_config_phase,  1888]  [debug] 12610#12610: *2 using configuration "/"
     2015/10/16 12:08:03[    ngx_http_core_find_config_phase,  1895]  [debug] 12610#12610: *2 http cl:-1 max:1048576
     2015/10/16 12:08:03[        ngx_http_core_rewrite_phase,  1810]  [debug] 12610#12610: *2 rewrite phase: 2 (NGX_HTTP_REWRITE_PHASE)
     2015/10/16 12:08:03[   ngx_http_core_post_rewrite_phase,  1963]  [debug] 12610#12610: *2 post rewrite phase: 3 (NGX_HTTP_POST_REWRITE_PHASE)
     2015/10/16 12:08:03[        ngx_http_core_generic_phase,  1746]  [debug] 12610#12610: *2 generic phase: 4 (NGX_HTTP_PREACCESS_PHASE)
     2015/10/16 12:08:03[        ngx_http_core_generic_phase,  1746]  [debug] 12610#12610: *2 generic phase: 5 (NGX_HTTP_PREACCESS_PHASE)
     2015/10/16 12:08:03[         ngx_http_core_access_phase,  2061]  [debug] 12610#12610: *2 access phase: 6 (NGX_HTTP_ACCESS_PHASE)
     2015/10/16 12:08:03[         ngx_http_core_access_phase,  2061]  [debug] 12610#12610: *2 access phase: 7 (NGX_HTTP_ACCESS_PHASE)
     2015/10/16 12:08:03[    ngx_http_core_post_access_phase,  2163]  [debug] 12610#12610: *2 post access phase: 8 (NGX_HTTP_POST_ACCESS_PHASE)
     2015/10/16 12:08:03[        ngx_http_core_content_phase,  2491]  [debug] 12610#12610: *2 content phase: 9 (NGX_HTTP_CONTENT_PHASE)
     2015/10/16 12:08:03[             ngx_http_index_handler,   191]  [debug] 12610#12610: *2 yang test ... index-count:3
     2015/10/16 12:08:03[             ngx_http_index_handler,   263]  [debug] 12610#12610: *2 open index "/var/yyz/www/ABC/index.html"
     2015/10/16 12:08:03[             ngx_http_index_handler,   283]  [debug] 12610#12610: *2 stat() "/var/yyz/www/ABC/index.html" failed (2: No such file or directory)
     2015/10/16 12:08:03[            ngx_http_index_test_dir,   364]  [debug] 12610#12610: *2 http index check dir: "/var/yyz/www/ABC"

     */ //默认http://10.2.13.167的时候,浏览器都会转换为http://10.2.13.167/发送到nginx服务器
    if (r->uri.data[r->uri.len - 1] != '/') { //末尾不是/,直接跳转到下一阶段
        return NGX_DECLINED;
    }

    if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) {
        return NGX_DECLINED;
    }

    ilcf = ngx_http_get_module_loc_conf(r, ngx_http_index_module);
    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

    allocated = 0;
    root = 0;
    dir_tested = 0;
    name = NULL;
    /* suppress MSVC warning */
    path.data = NULL;

    index = ilcf->indices->elts;
    //indices上默认有一个NGX_HTTP_DEFAULT_INDEX
    for (i = 0; i < ilcf->indices->nelts; i++) {//循环遍历index配置的文件,如果有该文件,则进行内部重定向,从新走NGX_HTTP_SERVER_REWRITE_PHASE

        if (index[i].lengths == NULL) {

            if (index[i].name.data[0] == '/') {
                return ngx_http_internal_redirect(r, &index[i].name, &r->args);
            }

            reserve = ilcf->max_index_len;
            len = index[i].name.len;

        } else {
            ngx_memzero(&e, sizeof(ngx_http_script_engine_t));

            e.ip = index[i].lengths->elts;
            e.request = r;
            e.flushed = 1;

            /* 1 is for terminating '\0' as in static names */
            len = 1;

            while (*(uintptr_t *) e.ip) {
                lcode = *(ngx_http_script_len_code_pt *) e.ip;
                len += lcode(&e);
            }

            /* 16 bytes are preallocation */

            reserve = len + 16;
        }

        if (reserve > allocated) {

            name = ngx_http_map_uri_to_path(r, &path, &root, reserve);
            if (name == NULL) {
                return NGX_ERROR;
            }

            allocated = path.data + path.len - name;
        }

        if (index[i].values == NULL) {

            /* index[i].name.len includes the terminating '\0' */

            ngx_memcpy(name, index[i].name.data, index[i].name.len);

            path.len = (name + index[i].name.len - 1) - path.data;

        } else {
            e.ip = index[i].values->elts;
            e.pos = name;

            while (*(uintptr_t *) e.ip) {
                code = *(ngx_http_script_code_pt *) e.ip;
                code((ngx_http_script_engine_t *) &e);
            }

            if (*name == '/') {
                uri.len = len - 1;
                uri.data = name;
                return ngx_http_internal_redirect(r, &uri, &r->args);
            }

            path.len = e.pos - path.data;

            *e.pos = '\0';
        }

        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "open index \"%V\"", &path);

        ngx_memzero(&of, sizeof(ngx_open_file_info_t));

        of.read_ahead = clcf->read_ahead;
        of.directio = clcf->directio;
        of.valid = clcf->open_file_cache_valid;
        of.min_uses = clcf->open_file_cache_min_uses;
        of.test_only = 1;
        of.errors = clcf->open_file_cache_errors;
        of.events = clcf->open_file_cache_events;

        if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }

        if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
            != NGX_OK)
        {
            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, of.err,
                           "%s \"%s\" failed", of.failed, path.data);

            if (of.err == 0) {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
            }

#if (NGX_HAVE_OPENAT)
            if (of.err == NGX_EMLINK
                || of.err == NGX_ELOOP)
            {
                return NGX_HTTP_FORBIDDEN;
            }
#endif

            if (of.err == NGX_ENOTDIR
                || of.err == NGX_ENAMETOOLONG
                || of.err == NGX_EACCES)
            {
                return ngx_http_index_error(r, clcf, path.data, of.err);
            }

            if (!dir_tested) {
                rc = ngx_http_index_test_dir(r, clcf, path.data, name - 1);

                if (rc != NGX_OK) {
                    return rc;
                }

                dir_tested = 1;
            }

            if (of.err == NGX_ENOENT) {
                continue; //stat获取的参数file_name指定的文件不存在
            }

            ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err,
                          "%s \"%s\" failed", of.failed, path.data);

            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }

        uri.len = r->uri.len + len - 1;

        if (!clcf->alias) {
            uri.data = path.data + root;

        } else {
            uri.data = ngx_pnalloc(r->pool, uri.len);
            if (uri.data == NULL) {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
            }

            p = ngx_copy(uri.data, r->uri.data, r->uri.len);
            ngx_memcpy(p, name, len - 1);
        }

        return ngx_http_internal_redirect(r, &uri, &r->args); //内部重定向
    }

    return NGX_DECLINED;
}
/****************************************************************** 
		index指令的理解,当访问某个目录时未指定文件,如果此location
		设置了index指令,将返回index指令设置的页面
 ******************************************************************/
static ngx_int_t
ngx_http_index_handler(ngx_http_request_t *r)
{
    u_char                       *p, *name;
    size_t                        len, root, reserve, allocated;
    ngx_int_t                     rc;
    ngx_str_t                     path, uri;
    ngx_uint_t                    i, dir_tested;
    ngx_http_index_t             *index;
    ngx_open_file_info_t          of;
    ngx_http_script_code_pt       code;
    ngx_http_script_engine_t      e;
    ngx_http_core_loc_conf_t     *clcf;
    ngx_http_index_loc_conf_t    *ilcf;
    ngx_http_script_len_code_pt   lcode;

    if (r->uri.data[r->uri.len - 1] != '/') {		//	uri不是“/”结尾时,说明uri中最后指定了文件,index和autoindex模块将不处理,交由static模块处理
        return NGX_DECLINED;
    }

    if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) {
        return NGX_DECLINED;
    }

	//	这里获取的r->loc_conf可能是server层的也有可能是location层的,需要检查是否有匹配到配置文件中的Location
    ilcf = ngx_http_get_module_loc_conf(r, ngx_http_index_module);			
    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

    allocated = 0;
    root = 0;
    dir_tested = 0;
    name = NULL;
    /* suppress MSVC warning */
    path.data = NULL;

    index = ilcf->indices->elts;
    for (i = 0; i < ilcf->indices->nelts; i++) {	//	遍历index指令指定的每个参数

        if (index[i].lengths == NULL) {				//	index指令参数中没有使用变量时

            if (index[i].name.data[0] == '/') {		//	index指定的参数以"/"开始的, 将产生内部重定向。
                return ngx_http_internal_redirect(r, &index[i].name, &r->args);
            }

            reserve = ilcf->max_index_len;
            len = index[i].name.len;

        } else {									//	index指令参数使用了变量

			//	计算index指令参数指定的变量+常量字符串的长度
            ngx_memzero(&e, sizeof(ngx_http_script_engine_t));

            e.ip = index[i].lengths->elts;
            e.request = r;
            e.flushed = 1;

            /* 1 is for terminating '\0' as in static names */
            len = 1;

            while (*(uintptr_t *) e.ip) {
                lcode = *(ngx_http_script_len_code_pt *) e.ip;
                len += lcode(&e);
            }

            /* 16 bytes are preallocation */

            reserve = len + 16;
        }

        if (reserve > allocated) {

            name = ngx_http_map_uri_to_path(r, &path, &root, reserve);
            if (name == NULL) {
                return NGX_ERROR;
            }

            allocated = path.data + path.len - name;			//	???
        }

        if (index[i].values == NULL) {

            /* index[i].name.len includes the terminating '\0' */

            ngx_memcpy(name, index[i].name.data, index[i].name.len);			//	拷贝index指令指定的参数(e.g. "/usr/local/nginx/html/index1/index.html")

            path.len = (name + index[i].name.len - 1) - path.data;

        } else {
            e.ip = index[i].values->elts;
            e.pos = name;

            while (*(uintptr_t *) e.ip) {
                code = *(ngx_http_script_code_pt *) e.ip;
                code((ngx_http_script_engine_t *) &e);
            }

            if (*name == '/') {
                uri.len = len - 1;
                uri.data = name;
                return ngx_http_internal_redirect(r, &uri, &r->args);
            }

            path.len = e.pos - path.data;

            *e.pos = '\0';
        }

        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "open index \"%V\"", &path);

        ngx_memzero(&of, sizeof(ngx_open_file_info_t));

        of.read_ahead = clcf->read_ahead;
        of.directio = clcf->directio;
        of.valid = clcf->open_file_cache_valid;
        of.min_uses = clcf->open_file_cache_min_uses;
        of.test_only = 1;
        of.errors = clcf->open_file_cache_errors;
        of.events = clcf->open_file_cache_events;

        if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }

        if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
            != NGX_OK)
        {
            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, of.err,
                           "%s \"%s\" failed", of.failed, path.data);

            if (of.err == 0) {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
            }

#if (NGX_HAVE_OPENAT)
            if (of.err == NGX_EMLINK
                || of.err == NGX_ELOOP)
            {
                return NGX_HTTP_FORBIDDEN;
            }
#endif

            if (of.err == NGX_ENOTDIR
                || of.err == NGX_ENAMETOOLONG
                || of.err == NGX_EACCES)
            {
                return ngx_http_index_error(r, clcf, path.data, of.err);
            }

            if (!dir_tested) {
                rc = ngx_http_index_test_dir(r, clcf, path.data, name - 1);

                if (rc != NGX_OK) {
                    return rc;
                }

                dir_tested = 1;
            }

            if (of.err == NGX_ENOENT) {
                continue;
            }

            ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err,
                          "%s \"%s\" failed", of.failed, path.data);

            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }

        uri.len = r->uri.len + len - 1;

        if (!clcf->alias) {
            uri.data = path.data + root;

        } else {
            uri.data = ngx_pnalloc(r->pool, uri.len);
            if (uri.data == NULL) {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
            }

            p = ngx_copy(uri.data, r->uri.data, r->uri.len);
            ngx_memcpy(p, name, len - 1);
        }

        return ngx_http_internal_redirect(r, &uri, &r->args);
    }//	End for

    return NGX_DECLINED;
}
static ngx_int_t
ngx_http_index_handler(ngx_http_request_t *r)
{
    u_char                       *p, *name;
    size_t                        len, root, reserve, allocated;
    ngx_int_t                     rc;
    ngx_str_t                     path, uri;
    ngx_uint_t                    i, dir_tested;
    ngx_http_index_t             *index;
    ngx_open_file_info_t          of;
    ngx_http_script_code_pt       code;
    ngx_http_script_engine_t      e;
    ngx_http_core_loc_conf_t     *clcf;
    ngx_http_index_loc_conf_t    *ilcf;
    ngx_http_script_len_code_pt   lcode;

    if (r->uri.data[r->uri.len - 1] != '/') {
        return NGX_DECLINED;
    }

    if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) {
        return NGX_DECLINED;
    }

    ilcf = ngx_http_get_module_loc_conf(r, ngx_http_index_module);
    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

    allocated = 0;
    root = 0;
    dir_tested = 0;
    name = NULL;
    /* suppress MSVC warning */
    path.data = NULL;

    index = ilcf->indices->elts;
    for (i = 0; i < ilcf->indices->nelts; i++) {

        if (index[i].lengths == NULL) {

            if (index[i].name.data[0] == '/') {
                return ngx_http_internal_redirect(r, &index[i].name, &r->args);
            }

            reserve = ilcf->max_index_len;
            len = index[i].name.len;

        } else {
            ngx_memzero(&e, sizeof(ngx_http_script_engine_t));

            e.ip = index[i].lengths->elts;
            e.request = r;
            e.flushed = 1;

            /* 1 is for terminating '\0' as in static names */
            len = 1;

            while (*(uintptr_t *) e.ip) {
                lcode = *(ngx_http_script_len_code_pt *) e.ip;
                len += lcode(&e);
            }

            /* 16 bytes are preallocation */

            reserve = len + 16;
        }

        if (reserve > allocated) {

            name = ngx_http_map_uri_to_path(r, &path, &root, reserve);
            if (name == NULL) {
                return NGX_ERROR;
            }

            allocated = path.data + path.len - name;
        }

        if (index[i].values == NULL) {

            /* index[i].name.len includes the terminating '\0' */

            ngx_memcpy(name, index[i].name.data, index[i].name.len);

            path.len = (name + index[i].name.len - 1) - path.data;

        } else {
            e.ip = index[i].values->elts;
            e.pos = name;

            while (*(uintptr_t *) e.ip) {
                code = *(ngx_http_script_code_pt *) e.ip;
                code((ngx_http_script_engine_t *) &e);
            }

            if (*name == '/') {
                uri.len = len - 1;
                uri.data = name;
                return ngx_http_internal_redirect(r, &uri, &r->args);
            }

            path.len = e.pos - path.data;

            *e.pos = '\0';
        }

        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "open index \"%V\"", &path);

        ngx_memzero(&of, sizeof(ngx_open_file_info_t));

        of.read_ahead = clcf->read_ahead;
        of.directio = clcf->directio;
        of.valid = clcf->open_file_cache_valid;
        of.min_uses = clcf->open_file_cache_min_uses;
        of.test_only = 1;
        of.errors = clcf->open_file_cache_errors;
        of.events = clcf->open_file_cache_events;

        if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
            != NGX_OK)
        {
            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, of.err,
                           "%s \"%s\" failed", of.failed, path.data);

            if (of.err == 0) {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
            }

            if (of.err == NGX_ENOTDIR
                || of.err == NGX_ENAMETOOLONG
                || of.err == NGX_EACCES)
            {
                return ngx_http_index_error(r, clcf, path.data, of.err);
            }

            if (!dir_tested) {
                rc = ngx_http_index_test_dir(r, clcf, path.data, name - 1);

                if (rc != NGX_OK) {
                    return rc;
                }

                dir_tested = 1;
            }

            if (of.err == NGX_ENOENT) {
                continue;
            }

            ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err,
                          "%s \"%s\" failed", of.failed, path.data);

            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }

        uri.len = r->uri.len + len - 1;

        if (!clcf->alias) {
            uri.data = path.data + root;

        } else {
            uri.data = ngx_pnalloc(r->pool, uri.len);
            if (uri.data == NULL) {
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
            }

            p = ngx_copy(uri.data, r->uri.data, r->uri.len);
            ngx_memcpy(p, name, len - 1);
        }

        return ngx_http_internal_redirect(r, &uri, &r->args);
    }

    return NGX_DECLINED;
}