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How to test azure function on localhost from the Internet?

What a stupid question, isn’t it? You can answer like I would use my public IP and setup proxy on IIS to access it. Isn’t good enough?

As I (and probably you) know life is not so simple there are firewalls, NATs and more security tools which destroy developers life;)

Secure tunnels to localhost

To make life easier we can use some kind of tunnels to localhost. For example ngrok. If you never used it before a short list of features below:

  • HTTP(S) tunnels
  • TCP tunnels
  • TLS tunnels
  • custom domain and custom prefix support in paid plans

Setup with Azure function

The setup is piece of cake. Download it from the official website. Run .\ngrok authtoken aaa to generate a config file. Its location will be printed as output. In 99% cases it is C:\Users\[my user name]\.ngrok2\ngrok.yml. Now open it in your favourite editor and replace content with following:

    proto: http
    addr: 7071
    host_header: localhost

You have just configured running ngrok with protocol http and https on port 7071, with rewrite host header to localhost on the template called azurefunction. Now last two steps. Run your Azure function on localhost from Visual Studio with F5 and in PowerShell (or cmd) type:

.\ngrok.exe start azurefunction

After a while, in the output you will see your current Internet domain for tests. It will apper in Session Status column. Moreover, you can access ngrok portal on like below

Have fun!

p.s. Of cource you can also debug your Azure function deployed to Azure. But in my opinion, this way is faster.

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