Merge pull request #3 from msemenistyi/master

add iis config

Author: igrigorik

iis.config

@@ -0,0 +1,33 @@
+<system.webServer>
+    <rewrite>
+        <rules>
+            <rule name="webp">
+                <match url="(.+)\.(jpe?g|png)$" ignoreCase="false" />
+                <conditions logicalGrouping="MatchAll">
+                    <add input="{HTTP_ACCEPT}" pattern="image/webp" ignoreCase="false" />
+                    <add input="{DOCUMENT_ROOT}/{R:1}.webp" matchType="IsFile" />
+                </conditions>
+                <action type="Rewrite" url="{R:1}.webp" logRewrittenUrl="true" />
+              <serverVariables>
+                  <set name="ACCEPTS_WEBP" value="true" />
+              </serverVariables>
+            </rule>
+        </rules>
+
+        <outboundRules>
+          <rule name="Set Vary header" preCondition="IsWebp">
+            <match serverVariable="RESPONSE_Vary" pattern=".*" />
+            <action type="Rewrite" value="Accept"/>
+          </rule>
+          <preConditions>
+             <preCondition name="IsWebp">
+              <add input="{ACCEPTS_WEBP}" pattern="true" ignoreCase="false" />
+             </preCondition>
+            </preConditions>
+        </outboundRules>
+
+    </rewrite>
+    <staticContent>
+        <mimeMap fileExtension=".webp" mimeType="image/webp" />
+    </staticContent>
+</system.webServer>