CODEWITHSUNDEEP
azurehttp-redirectazure-application-gateway
Richard Banks
Richard Banks

Reputation: 2983

redirect from non www to www not working in azure using a waf doesnt work

We have a site set up on an azure app service. We have an application gateway setup to act as a waf, however it seems to be causing issues with our non www to www redirect which is shown below. The redirect works as expected when browsing directly to the site which points to the waf being the problem. Has anyone experienced this issue. I suspect the host is changed to xxxxx.azurewebsites.net when it forwards the request on but can find no documentation about this. Has anyone experienced this before?

<rule name="Prepend WWW" enabled="true" stopProcessing="true">
                <match url="^(.*)$" />
                <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
                    <add input="{HTTP_HOST}" pattern="^(.*)azurewebsites.net$" negate="true" />
                    <add input="{HTTP_HOST}" pattern="^(?!www\.)(.*)$" />
                </conditions>
                <action type="Redirect" url="https://www.{C:0}{PATH_INFO}" redirectType="Permanent" />
            </rule>

Upvotes: 0

Views: 1564

Answers (1)

Nancy Xiong
Nancy Xiong

Reputation: 28274

There is a simple way to directly redirect a none-www hostname in the URL to www hostname on the DNS level without having conditions rules on web.config. You could create a CNAME record that maps non-www domain example.com to www.example.com in your domain DNS provider. Your domain DNS provider may need support CNAME records in the root domain. You also could map www.example.com to your application gateway IP address.

Another way is to configure redirection and routing rules on the application gateway level. You may add two multi-site listeners, one is for host example.com, another is for host www.example.com. Then configure the redirection from one listener to another listener. You could get more info on the Application Gateway redirect overview.

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Upvotes: 0

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