Sometimes we need to know how many modules are available in Apache2,for example,you want to enable mod_rewrite in Linux server,normally we need to test if the mod_rewrite module has been added first.We can use command:apache2ctl -M to test how many modules are available in Apache2.

Apache has an option names LimitRequestBody,this option can limit user sending's content of http request.Option LimiRequestBody can be used in .htaccess & httpd.conf.If you use it in http.conf, may use separately in virtualhost or the directory attribute setting. The LimitRequestBody setting value is lies between (unlimitedly) 0 to 2147483647 (2GB).

A project's website of our company has been running for a period of time, we ever changed several domains for this website before. Now,we want a smooth transition to a new domain names, that relates to the issue of old links turn to new links automatically for the new domain.