IIS AAR/URL rewrite for Reverse proxy

gistfile1.txt

NOTES:
1 - Creat an empty directory for each appliction that requires URL re-write/AAR example:  inetpub\wwwroot\sonarr
2 - Create a "Virtual Directory" in IIS for EACH application that requires AAR which points to the physical directory that you created above
3 - Set application settings at the applcation level!!! DO NOT set URL rewrite rules at server or website level
4 - you first thave to set the SITE server variables.  This is done at the SITE level (See screenshot) and example in first block below.
5 - You need to configure each application individually as they each require unique headers

Server Varables example:  https://imgur.com/a/9LaIr

These values are set at site level and the file resides in C:\Windows\System32\inetsrv\Config

```
        <rewrite>
            <allowedServerVariables>
                <add name="HTTP_ACCEPT_ENCODING" />
                <add name="HTTP_X_ORIGINAL_ACCEPT_ENCODING" />
                <add name="HTTP_X_FORWARDED_HOST" />
                <add name="HTTP_X_FORWARDED_SCHEMA" />
                <add name="HTTP_X_FORWARDED_PROTO" />
                <add name="HTTP_X_FORWARDED_SSL" />
                <add name="HTTP_X_FORWARDED_FOR" />
                <add name="HTTP_X_REAL_IP" />
                <add name="HTTP_X_DELUGE_BASE" />
                <add name="include" />
                <add name="host" />
                <add name="proxy_hide_header" />
                <add name="HTTP_X_FRAME_OPTIONS" />
            </allowedServerVariables>
        </rewrite>
        ```




This is an example of a web.confg file that would reside in the sub application directory example \inetpub\wwwroot\sonarr\web.config
In theory, you could place the below file in that directory, replace your IP:PORT values, and IIS would be configured for AAR/URL rewrtie for that applcation. 


```
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
             <rules>
                <clear />
                <rule name="ReverseProxyInboundRulesonarr" stopProcessing="true">
                    <match url="(.*)" />
                    <conditions logicalGrouping="MatchAll" trackAllCaptures="false" />
                    <serverVariables>
                        <set name="HTTP_X_REAL_IP" value="$remote_addr" />
                        <set name="HTTP_X_FORWARDED_FOR" value="$proxy_add_x_forwarded_for" />
                        <set name="HTTP_X_ORIGINAL_ACCEPT_ENCODING" value="{HTTP_ACCEPT_ENCODING}" />
                        <set name="HTTP_ACCEPT_ENCODING" value="" />
                    </serverVariables>
                    <action type="Rewrite" url="http://192.168.1.20:38084/sonarr/{R:1}" />
                </rule>
            </rules>
			
			<outboundRules>
                <clear />
                <rule name="Restore Encoding" preCondition="Restore HTTP_ACCEPT_ENCODING}" enabled="true">
                    <match serverVariable="HTTP_ACCEPT_ENCODING" pattern="^(.+)" />
                    <conditions logicalGrouping="MatchAll" trackAllCaptures="true" />
                    <action type="Rewrite" value="{HTTP_X_ORIGINAL_ACCEPT_ENCODING}" />
                </rule>
                
				<rule name="ReverseProxyOutboundsonarr" preCondition="ResponseIsHtml1" patternSyntax="ECMAScript">
                    <match filterByTags="A, Area, Base, Form, Head, IFrame, Img, Input, Link, Script" pattern="^http(s)?://192.168.1.20:38084/sonarr/(.*)" />
                    <conditions logicalGrouping="MatchAll" trackAllCaptures="true" />
                    <action type="Rewrite" value="http{R:1}://yourcomain.com/sonarr/{R:2}" />
                </rule>
				
				<preConditions>
                    <remove name="Restore HTTP_ACCEPT_ENCODING}" />
                    <remove name="ResponselsHTML1" />
                    <remove name="ResponseIsHtml1" />
                    <remove name="NeedsRestoringAcceptEncoding" />
					<preCondition name="ResponseIsHtml1">
						<add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/html" />
					</preCondition>
					<preCondition name="Restore HTTP_ACCEPT_ENCODING}">
                        <add input="{RESPONSE_CONTENT_TYPE}" pattern=".+" />
					</preCondition>
				</preConditions>
            </outboundRules>
            <rewriteMaps>
                <remove name="FTPtoVileVista" />
            </rewriteMaps>
           
        </rewrite>
        <defaultDocument>
            <files>
                <clear />
                <add value="phpinfo.php" />
                <add value="Default.htm" />
                <add value="Default.asp" />
                <add value="index.htm" />
                <add value="iisstart.htm" />
                <add value="default.aspx" />
                <add value="index.php" />
            </files>
        </defaultDocument>
        <security>
            <authentication>
                <anonymousAuthentication enabled="false" />
            </authentication>
        </security>
        <urlCompression doDynamicCompression="false" />
    </system.webServer>
</configuration>

```

Hey there, cant seem to make this config work, has something changed with sonarr in the past few years?

Any input is appreciated