Prerender IIS Web.config

web.config

<?xml version="1.0"?>
<configuration>
    <system.webServer>
        <httpProtocol>
            <customHeaders>
                <add name="X-Prerender-Token" value="XXXXXXXXXXXXX" />
            </customHeaders>
        </httpProtocol>
        <rewrite>
            <rules>
                <!--# Only proxy the request to Prerender if it's a request for HTML-->
                <rule name="Prerender" stopProcessing="true">
                    <match url="^(?!.*?(\.js|\.css|\.xml|\.less|\.png|\.jpg|\.jpeg|\.gif|\.pdf|\.doc|\.txt|\.ico|\.rss|\.zip|\.mp3|\.rar|\.exe|\.wmv|\.doc|\.avi|\.ppt|\.mpg|\.mpeg|\.tif|\.wav|\.mov|\.psd|\.ai|\.xls|\.mp4|\.m4a|\.swf|\.dat|\.dmg|\.iso|\.flv|\.m4v|\.torrent))(.*)" ignoreCase="false" />
                    <conditions logicalGrouping="MatchAny">
                        <add input="{HTTP_USER_AGENT}" pattern="baiduspider|facebookexternalhit|twitterbot" />
                        <add input="{QUERY_STRING}" pattern="_escaped_fragment_" ignoreCase="false" />
                    </conditions>
                    <action type="Rewrite" url="http://service.prerender.io/http://yourwebsite.com/{R:2}" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>

If anyone ever encounters this issue, I've tried the stuff above and got it working after many hours by mixing some things up.

1. In your Web App root directory (/site/wwwroot), add or update your web.config file with this:

<configuration>
  <system.webServer>     
    <rewrite>     
        <rules>
            <rule name="Prerender" stopProcessing="true">
                <serverVariables>
                    <set name="HTTP_X_PRERENDER_TOKEN" value="**YOUR TOKEN**" />
                </serverVariables>
                <match url="^(?!.*?(\.js|\.css|\.xml|\.less|\.png|\.jpg|\.jpeg|\.gif|\.pdf|\.doc|\.txt|\.ico|\.rss|\.zip|\.mp3|\.rar|\.exe|\.wmv|\.doc|\.avi|\.ppt|\.mpg|\.mpeg|\.tif|\.wav|\.mov|\.psd|\.ai|\.xls|\.mp4|\.m4a|\.swf|\.dat|\.dmg|\.iso|\.flv|\.m4v|\.torrent))(.*)" ignoreCase="false" />
                <conditions logicalGrouping="MatchAny">
                    <add input="{HTTP_USER_AGENT}" pattern="bingbot|googlebot|baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest|slackbot|vkShare|W3C_Validator" />
                </conditions>
                <action type="Rewrite" url="https://service.prerender.io/https://{HTTP_HOST}{REQUEST_URI}" appendQueryString="false" />
            </rule>
        </rules>
    </rewrite>

  </system.webServer>
</configuration>

2. In /site/ create a file named applicationHost.xdt and add this content:

<?xml version="1.0"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
    <system.webServer>
        <proxy xdt:Transform="InsertIfMissing" enabled="true" preserveHostHeader="false" reverseRewriteHostInResponseHeaders="false" />
        <rewrite>
            <allowedServerVariables>
                <add name="HTTP_X_PRERENDER_TOKEN" xdt:Transform="InsertIfMissing" />
            </allowedServerVariables>
        </rewrite>
    </system.webServer>
</configuration>

**3. Restart your Web App service (click 'Stop' and 'Start', not only 'Restart').

4. Test with a tool like: https://technicalseo.com/tools/fetch-render/

Hope this helps someone.

This worked for us. Our rewrite is as follows:

        <rule name="Seo rewrite rule" stopProcessing="true">
          <serverVariables>
            <set name="HTTP_X_PRERENDER_TOKEN" value="[...your token...]" />
          </serverVariables>
          <conditions>
            <add input="{QUERY_STRING}" pattern="(.*)_escaped_fragment_=(.*)" />
          </conditions>
          <action type="Rewrite" url="http://service.prerender.io/http://{HTTP_HOST}{REQUEST_URI}" appendQueryString="false" />
        </rule>

As far as the "allowableServerVariables", we handled this through the IIS and clicking either the Default Web Site of the Site itself, then clicking the URL Rewrite module icon, then select View Server Variables, and add the HTTP_X_PRERENDER_TOKEN variable name to the list.

With this in place, we were now able to append the escaped_fragment querystring to our urls and see the rewritten results after coming back through the server. You should also be able to verify in your Account page on PreRender.io that the pages are being cached.

HTH,
Randy

Hi!!

I spend a lot days for the solution, but i add the variable and works fine!!!

Solution for me :

Only exist the web.config with the configuration (Htm5 redirect and this) , i dont need it applicationHos.xdt.:

---

<rewrite>
          <rules>
              <!--# Only proxy the request to Prerender if it's a request for HTML-->
              <rule name="SEO" stopProcessing="true">
              <match url="^(?!.*?(\.js|\.css|\.xml|\.html|\.less|\.png|\.jpg|\.jpeg|\.gif|\.pdf|\.doc|\.txt|\.ico|\.rss|\.zip|\.mp3|\.rar|\.exe|\.wmv|\.doc|\.avi|\.ppt|\.mpg|\.mpeg|\.tif|\.wav|\.mov|\.psd|\.ai|\.xls|\.mp4|\.m4a|\.swf|\.dat|\.dmg|\.iso|\.flv|\.woff|\.ttf|\.m4v|\.svg|\.torrent))(.*)" ignoreCase="false" />
              <conditions logicalGrouping="MatchAny">
                  <add input="{HTTP_USER_AGENT}" pattern="facebookexternalhit|twitterbot|googlebot|whatsapp" />
                  <add input="{QUERY_STRING}" pattern="(.*)_escaped_fragment_=(.*)" ignoreCase="false" />
              </conditions>
                  <action type="Rewrite" url="http://service.prerender.io/http://{HTTP_HOST}{REQUEST_URI}" appendQueryString="false" /> 
              <serverVariables>
                <set name="HTTP_X_PRERENDER_TOKEN" value="yourtoken" /> 
              </serverVariables>
              </rule>
              <rule name="Redirect To Index" stopProcessing="true">
                  <match url=".*" />
                  <conditions>
                      <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                      <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
                  </conditions>
                  <action type="Rewrite" url="/" />
              </rule> 
          </rules>
      </rewrite>

---

The next step was as you indicates ; add into Rewrite module icon, then select View Server Variables, the new variable name "HTTP_X_PRERENDER_TOKEN" and works !! amazing =)!!

Thnks for your time.

I want to share my test options ;

1.-https://technicalseo.com/tools/fetch-render/
2.-https://developers.facebook.com/tools/debug

Any ask or something im here