我们在我们的某个子域上有“HTTP基本认证”，但希望允许所有内容访问该子域上的特定URL而无需进行身份验证（对于第三方访问我们的webhook URL）。
所以我尝试使用SetEnvIf Request_URI ^/webhook/ allow来允许Allow from env=allow（完整文件如下），但似乎因为我们有一些mod_rewrite规则来重写所有这些URL到PHP入口点，Request_URI实际上从来没有/webhook一旦到达这一点（猜测，但不知道如何100%确认这一点。
它仍然要求一个基本的auth用户/通行证，而不管URL是什么。

请注意，.htaccess文件在我们所有的域/子域上都是相同的，而VirtualHost可以只为这个子域配置。
完整的VirtualHost配置，包含“HTTP Basic Auth”配置部分：

<VirtualHost *:80>
  RewriteEngine on
  RewriteCond %{HTTP:X-Forwarded-Proto} !https
  RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [R=permanent,L]
  DocumentRoot /var/www/sub.ourdomain.co.uk/blah/www
  ServerAdmin [email protected]
  ServerName sub.ourdomain.co.uk
  ServerAlias www.sub.ourdomain.co.uk
  ErrorDocument 400 /error.php
  ErrorDocument 401 /error.php
  ErrorDocument 403 /403.html
  ErrorDocument 404 /error.php
  ErrorDocument 405 /error.php
  ErrorDocument 408 /error.php
  ErrorDocument 410 /error.php
  ErrorDocument 411 /error.php
  ErrorDocument 412 /error.php
  ErrorDocument 413 /error.php
  ErrorDocument 414 /error.php
  ErrorDocument 415 /error.php
  ErrorDocument 500 /error.php
  ErrorDocument 501 /error.php
  ErrorDocument 502 /error.php
  ErrorDocument 503 /error.php
  ErrorDocument 506 /error.php
  ErrorLog /var/log/httpd/sub.ourdomain.co.uk.apache.log
  CustomLog /var/log/httpd/sub.ourdomain.co.uk.access.log combined
  <Directory "/var/www/sub.ourdomain.co.uk/blah/www">
    SetEnvIf Request_URI ^/webhook/ allow
    AuthType Basic
    AuthName "Restricted Content"
    AuthUserFile /etc/httpd/passwords/sub.ourdomain.co.uk
    # Setup a deny/allow
    Order Deny,Allow
    # Deny from everyone
    Deny from all
    # except if either of these are satisfied
    Satisfy any
    # 1. a valid authenticated user
    Require valid-user
    # or 2. the "allow" var is set
    Allow from env=allow
  </Directory>
</VirtualHost>

.htaccess mod_rewrite规则：

RewriteCond %{REQUEST_METHOD} !(^GET|^POST|^HEAD)
RewriteRule .* - [R=405,L]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !(/img|/js|/css|/fonts)
RewriteRule ^(.*)$ /boot.php
RewriteCond %{REQUEST_URI} ^/$
RewriteRule ^(.*)$ /boot.php

编辑1-基于我也尝试过的评论：SetEnv allow true和SetEnv allow 1来消除对它是否是URL的怀疑，它仍然要求基本的授权密码，所以它可能与URL无关。
编辑2-添加整个.htaccess以确保我没有遗漏其他东西：

php_value max_input_vars 4000
RewriteEngine on
# Disallow other HTTP verbs such as PUT and DELETE
RewriteCond %{REQUEST_METHOD} !(^GET|^POST|^HEAD)
RewriteRule .* - [R=405,L]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !(/img|/js|/css|/fonts|/twig|/pdf|/vendors|/server-status)
RewriteRule ^(.*)$ /boot.php
RewriteCond %{REQUEST_URI} ^/$
RewriteRule ^(.*)$ /boot.php
AddType font/ttf .ttf
AddType font/eot .eot
AddType font/otf .otf
AddType font/woff .woff
<IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE text/css text/javascript application/x-javascript application/javascript text/x-component text/html text/richtext image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon application/json font/woff font/otf font/eot font/ttf
</IfModule>
<ifModule mod_expires.c>
  ExpiresActive On
  ExpiresDefault "access plus 1 seconds"
  ExpiresByType text/html "access plus 1 seconds"
  ExpiresByType image/gif "access plus 2592000 seconds"
  ExpiresByType image/jpeg "access plus 2592000 seconds"
  ExpiresByType image/png "access plus 2592000 seconds"
  ExpiresByType text/css "access plus 604800 seconds"
  ExpiresByType font/ttf "access plus 604800 seconds"
  ExpiresByType font/eot "access plus 604800 seconds"
  ExpiresByType font/otf "access plus 604800 seconds"
  ExpiresByType font/woff "access plus 604800 seconds"
  ExpiresByType text/javascript "access plus 604800 seconds"
  ExpiresByType application/x-javascript "access plus 604800 seconds"
</ifModule>
<ifModule mod_headers.c>
  <filesMatch "\\.(ico|pdf|flv|jpg|jpeg|png|gif|swf)$">
    Header set Cache-Control "max-age=2592000, public, proxy-revalidate"
  </filesMatch>
  <filesMatch "\\.(js|css|ttf|eot|otf|woff)$">
    Header set Cache-Control "max-age=604800, public, proxy-revalidate"
  </filesMatch>
  <filesMatch "\\.(xml|txt)$">
    Header set Cache-Control "max-age=216000, public, must-revalidate"
  </filesMatch>
</ifModule>

编辑3-对不起，应该提到我们现在被困在Apache 2.2上。