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Advocate II
Advocate II

Header token authentication with an on-premise API?

Hello all,


I am trying to create a PowerApps front-end to an internal network API that is not internet accessible.


I can hit the API endpoints by enabling Data Gateway on the PowerApps Custom Connector, but this limits the forms of authentication I can use down to Windows and Basic.


As I've read up on, it appears for APIs that use a bearer token in the header authentication, there is a need to have the "API Key" authentication method selected when creating the Custom Connector, however this isn't available when using the Data Gateway. See:


Without exposing this API directly to the Internet, is there any options that I'm failing to think of that someone can suggest?

Thank you!

Community Support
Community Support

Hi @RyanW7,


What authentication methods does your data source support?

There is a post about Authorization Bearer in Header, I hope it could help you something: 

Best Regards,
Community Support Team _ Lin Tu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Hello @v-litu-msft 


I did see that post and that method  is exactly what I'm trying to accomplish,

the problem I am facing is you cannot use 'API Key' authentication if you enable 'Data Gateway'.


The reason 'Data Gateway' is needed is because my API endpoint is within a private network space and not publicly hosted.


My application creates a bearer token for authentication via:


Headers: Content-Type application/json



  "username": "user",

  "password": "password"



The response is as such with a body of:


  "access_token": "<authentication token>"



That <authentication token> needs to be in the header of any further API calls past logging in.


Does that help clarify?

Impactful Individual
Impactful Individual

@RyanW7 Did you ever find a way to do this?

Also having the same issue...


Hey there @RyanW7 , did you solve this issue ?

Power Automate
Power Automate

@yasminSarbaoui what auth type does your API support? For APIKey auth, you can try SetHeader or SetQueryParameter policy template :


@shyamsu just found out that we are on self signed scenario. 

Power Automate
Power Automate

@yasminSarbaoui by self signed, do you mean self signed certificate?

Hello @yasminSarbaoui  and @SamPo, No this remains unresolved.

There is currently no supported function to do header token authentication within a custom API connector that is on-premise. The only workarounds I have seen are to expose the API to the public Internet, OR to set it as 'No Authentication' and attempt to use a raw HTTP calls to provide the header which appears to be blocked as well.

2020-11-30 11_27_55-Power Apps.png2020-11-30 11_28_23-Power Apps.png

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