Is it possible to output any or all available vari

2020-05-26 15:35发布

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I'm trying to a build a .htaccess file with some rewrite rules and would like to know what several variables actually contain when my request is handled. Is there anyway of seeing what their values would be when Apache handles the request?

E.g. print the contents of %{HTTP_USER_AGENT}

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萌系小妹纸
2楼-- · 2020-05-26 16:00

Yes, it is possible to output the request variables through .htaccess.

You can do it by "hacking" a custom error status message. As long as you have AllowOverride set to FileInfo you can set and trigger a custom error response in your .htaccess file with the desired variables in the output:

ErrorDocument 404 "Request: %{THE_REQUEST} Referrer: %{HTTP_REFERER} Host: %{HTTP_HOST}"
RewriteRule ^ - [L,R=404]

For reference, a list of available variables is available in the Apache documentation.

Interestingly, you are not limited to using 400 or 500 error statuses for the error response override. You can even override the status 200 "ErrorDocument." That means you can do a lot more than just output variables for troubleshooting with this trick. Throw an <If> tag around it and you have a document!

<If "%{REQUEST_URI} =~ /compliance.html$/">
    ErrorDocument 200 "<html><body><h1>Yes, Max. Those were geeks.</h1></body>"
    RewriteRule ^ - [L,R=200]   
</If>
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三岁会撩人
3楼-- · 2020-05-26 16:07

Sure. Create this sort of .php file (echo.php):

<?php
phpinfo(INFO_VARIABLES);
?>

Add this rule in .htaccess:

RewriteEngine On

RewriteCond %{REQUEST_URI} !echo.php
RewriteRule .* echo.php?ua=%{HTTP_USER_AGENT}&https=%{HTTPS} [L]

Add more parameters if necessary.

Now call any URL and check the output (the GET parameters should be on the top of table).

But, TBH, almost all of this info is received by Apache and is available to PHP anyway: look at $_SERVER.

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