一个奇怪的问题位，但我想对我所有的网址设置查询字符串。如果没有设置参数（或为空），那么我想重定向到包含默认。

例如：

  example.com需要requrect到example.com?param=a

example.com?param还需要重定向到example.com?param=a
 

如果该参数设置，是已知值列表的一部分，那么它应该进行正常的：

  example.com?param=（A | B | C | D）会去到各个页面的A，B，C或D
 

该网站的部分页面使用其他参数进行排序和分页，所以规则不能想当然地认为这是唯一的查询字符串。

我试了几件事情，但一直得到卡在重定向循环。这是试图设置默认参数：

 的RewriteCond％{QUERY_STRING}（^ |＆安培;）参数=（A | B | C | D）（$ |＆安培;）
重写规则^（。*）$ /index.php?rq=$1&param=a [L，QSA]
 

主要CMS重写规则是：

 的RewriteCond％{REQUEST_URI} !^/*(index.php|blog|admin/assets|site/assets|robots.txt|sitemap(|-[0-9]+).xml|products.xml|favicon.ico)
重写规则^（。*）$ /index.php?rq=$1 [L，QSA]
 

任何帮助将是巨大的！

 的RewriteCond％{QUERY_STRING}（^ |＆安培）！参数=（A | B | C | D）（ $ |和放大器;）
的RewriteCond％{REQUEST_URI} !^/*(index.php|blog|admin/assets|site/assets|robots.txt|sitemap(|-[0-9]+).xml|products.xml|favicon.ico)
重写规则^（。*）$ $ 1％{QUERY_STRING}＆放大器;参数=一[L]

的RewriteCond％{REQUEST_URI} !^/*(index.php|blog|admin/assets|site/assets|robots.txt|sitemap(|-[0-9]+).xml|products.xml|favicon.ico)
重写规则^（。*）$ /index.php?rq=$1 [L，QSA]
 

Bit of an odd question, but I'd like to have a query string set on all of my URLs. If the parameter isn't set (or is empty), then I'd like to redirect to include a default.

For example:

example.com would need to requrect to example.com?param=a

example.com?param would also need to redirect to example.com?param=a

If the param is set and is part of a list of known values, then it should carry on as normal:

example.com?param=(a|b|c|d) would go to the respective page a,b,c or d

Some pages of the site use other parameters to sort and paginate, so the rules cannot assume that this is the only query string.

I've tried a couple of things, but kept getting stuck in a redirect loop. This is trying to set the default param:

RewriteCond %{QUERY_STRING} !(^|&)param=(a|b|c|d)($|&)
RewriteRule ^(.*)$ /index.php?rq=$1&param=a [L,QSA]

The main CMS rewrite rule is:

RewriteCond %{REQUEST_URI} !^/*(index.php|blog|admin/assets|site/assets|robots.txt|sitemap(|-[0-9]+).xml|products.xml|favicon.ico)
RewriteRule ^(.*)$ /index.php?rq=$1 [L,QSA]

Any help would be great!

RewriteCond %{QUERY_STRING} !(^|&)param=(a|b|c|d)($|&)
RewriteCond %{REQUEST_URI} !^/*(index.php|blog|admin/assets|site/assets|robots.txt|sitemap(|-[0-9]+).xml|products.xml|favicon.ico)
RewriteRule ^(.*)$ $1?%{QUERY_STRING}&param=a [L]

RewriteCond %{REQUEST_URI} !^/*(index.php|blog|admin/assets|site/assets|robots.txt|sitemap(|-[0-9]+).xml|products.xml|favicon.ico)
RewriteRule ^(.*)$ /index.php?rq=$1 [L,QSA]