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That’s not how TLS works in Azure App Service. TLS is terminated at the Frontend layer. Your application only has to deal with plain HTTP.
If you need to check if the request was made over HTTPS:
Application Request Routing (ARR) is attaching a special request header to every request that arrives over HTTPS. The value contained in X-ARR-SSL provides information about the TLS server certificate that was used to secure the TCP connection between the client and the ARR.
e.g.:
X-ARR-SSL: 2048|256|C=US, S=Washington, L=Redmond, O=Microsoft Corporation,
OU=Microsoft IT, CN=Microsoft IT SSL SHA2|CN=*.azurewebsites.net
My other answer here has more on that topic:
Is current request being made over SSL with Azure deployment
May I know how to get a proper SSL certificate for my app in azure ?
https://azure.microsoft.com/en-us/documentation/articles/web-sites-purchase-ssl-web-site/
You get free TLS on https://{site}.azurewebsites.net, that is if you don’t really need a custom domain or just looking to build a quick proof of concept.