如何将 SCRIPT_URI 写入 Apache 的标头？

我有一个设置，其中有这样的服务器：

负载均衡器 -> Apache -> Tomcat

我希望 Apache 将客户端使用的 url 写入标头中，这样一旦我点击 tomcat 就可以读取它。

我尝试使用 mod_rewrite 和 mod_headers 这样做，但没有运气。 如果我看http://httpd.apache.org/docs/2.0/mod/mod_rewrite.html http://httpd.apache.org/docs/2.0/mod/mod_rewrite.html那么很明显我需要名为 SCRIPT_URI 的变量：

SCRIPT_URI=http://en1.engelschall.com/u/rse/

我也看了这个http://www.askapache.com/htaccess/crazy-advanced-mod_rewrite-tutorial.html http://www.askapache.com/htaccess/crazy-advanced-mod_rewrite-tutorial.html所以弄清楚如何编写标题并取得了一些成功，但还不够。

我在 apache 服务器上安装了 php，如果我查看 phpinfo()，我可以看到 SCRIPT_URI 在那里并且有一个合理的值。

我只是无法将其写入标题。这是我所做的简化版本：

#load modules
LoadModule rewrite_module modules/mod_rewrite.so
LoadModule headers_module modules/mod_headers.so
#Get the original uri used
RewriteRule .* - [E=INFO_SCRIPT_URI:%{SCRIPT_URI},NE]
RequestHeader set x-orig-uri "%{INFO_SCRIPT_URI}e"

我已经尝试了其他几个选项，并且都在 Windows、cygwin 和 ubuntu linux 上

有任何想法吗？

我自己找到了一个解决方法，尽管这不是我想要的干净简单的解决方案。 我能够获得各个部分，并可以使用它们来构建完整的 URI：

<IfModule !rewrite_module>
    LoadModule rewrite_module modules/mod_rewrite.so
</IfModule>

<IfModule !headers_module>
    LoadModule headers_module modules/mod_headers.so
</IfModule>


<IfModule rewrite_module>
<IfModule headers_module>

####### INITIAL SETUP #########################
    RewriteEngine on

####### SET HEADERS #########################
    #get and set the host name
        RewriteRule .* - [E=INFO_HTTP_HOST:%{HTTP_HOST},NE]
        RequestHeader set x-orig-host "%{INFO_HTTP_HOST}e"


    #get and set the host port
        RewriteRule .* - [E=INFO_SERVER_PORT:%{SERVER_PORT},NE]
        RequestHeader set x-orig-port "%{INFO_SERVER_PORT}e"


    #If the uri starts with a slash and some alphanumerics, then make a 
    #group of that until the first non-alpha (ie. the next slash)
        RewriteCond %{REQUEST_URI} ^(/[\w-]+)
    #Save the content of the regex match group ( %1 ) in an environment variable
        RewriteRule .* - [E=INFO_REQUEST_CONTEXT:%1,NE]
    #Set a header with the content of the environment variable
        RequestHeader set x-orig-context "%{INFO_REQUEST_CONTEXT}e"


    #If the accept-header contains a number after ;version= then make a regex group of that number
        RewriteCond %{HTTP_ACCEPT} \+json;version=(\d+)$ 
    #Save the content of the regex match group ( %1 ) in an environment variable
        RewriteRule .* - [E=INFO_ACCEPT_VERSION:%1,NE]
    #Set a header with the content of the environment variable
        RequestHeader set x-orig-accept-version "%{INFO_ACCEPT_VERSION}e"


    #If the accept-header contains kasia2. followed by some letters, 
    #then make a regex group of those letters
        RewriteCond %{HTTP_ACCEPT} kasia2.(\w+).*
    #Save the content of the regex match group ( %1 ) in an environment variable
        RewriteRule .* - [E=INFO_ACCEPT_NAME:%1,NE]
    #Set a header with the content of the environment variable
        RequestHeader set x-orig-accept-name "%{INFO_ACCEPT_NAME}e"


    #If https is on ...
        RewriteCond %{HTTPS} on
    #...then set the protocol environment variable to "https"
        RewriteRule .* - [E=INFO_PROTOCOL:https,NE]
    #If https is off ...
        RewriteCond %{HTTPS} off
    #...then we assume it must be "http"
        RewriteRule .* - [E=INFO_PROTOCOL:http,NE]
    #Finally, set the protocol header
        RequestHeader set x-orig-protocol "%{INFO_PROTOCOL}e"


    #Get the request uri and set an environment variable
        RewriteRule .* - [E=INFO_REQUEST_URI:%{REQUEST_URI},NE]
    #Build the whole original url out of the available parts. SCRIPT_URI is always null, otherwise we could have used that.
        RequestHeader set x-orig-url "%{INFO_PROTOCOL}e://%{INFO_HTTP_HOST}e%{INFO_REQUEST_URI}e"
    #In addition make an url with only the host and context, for convenience
        RequestHeader set x-orig-url-base "%{INFO_PROTOCOL}e://%{INFO_HTTP_HOST}e%{INFO_REQUEST_CONTEXT}e"

</IfModule>
</IfModule>