Showing results for 
Search instead for 
Did you mean: 
Frequent Visitor

Custom API & headers/cookies

The documentation does not mention what are the expectations developers should have for how PowerApps will handle headers and cookies. 


Can we rely on PowerApps to persist cookies or any other headers for a stateful session, or must we explicitly tell PowerApps what to pass based on the swagger specifications?


Power Apps
Power Apps

Currently, there should be no expectation of cookies being sent to the service. That being said, we will pass you any information explicitly specified by parameters in the Swagger. The values for these parameters always come from data within the App, not the browser client running the app. So even if you specify in Swagger a parameter with 'in': 'header', 'name': 'Cookie', the value for this parameter will come from app data flow, not from the browser's current Cookie values. There's no special-handling for certain headers.


There is an exception here, and that is information used to authenticate with the target host in the Swagger. This is where the 'security' section(s) of the Swagger come into play. If what's desired is the ability to have a per-user state on your servers, then this is usually accomplished by piggy backing on the logged in user's authentication/identity. Note, that PowerApps Client uses the Authorization header to authenticate with the Connectors, so this header will get overridden and then removed before talking to your CustomApi host service.


Please take a look at this post on what authentication is currently supported by CustomAPIs:




Thanks for confirming! I want to point out that currently, the page does not mention anything about the token that the powerapps apparently uses as described in that thread? Wil this be documented and supported method for identifying the user on a per-user basis? The authentication supported by PA appears to operate at the application level, not per-user and there is no way to pass through the authentication. 

The authentication model in PowerApps and Flow is per connection. But right now only a few connections can be shared between users (like sql) and we haven't exposed a way for custom APIs to opt-in to shareability.


The header info mentioned in that other thread will identify the caller, but isn't as secure as requiring an oauth token to talk to your custom API (which gets back to the securityDefinition part of the swagger Joe alluded to). The recommended way to securely authenticate a user with your API is to configure login for your API. This is also important if you want to use your custom API with Flow, because when a flow calls your API, the "caller" in the headers will be the flow itself. It does not impersonate the user who set up the flow.

Two things:


1) I think I figured out why I was confused. Apparently, cookies do get persisted when testing with the Windows client of PowerApps studio. If I do the same thing running in the web browser, the cookies are not returned. This difference in the behavior when testing with Windows client versus web browser is misleading.


2) Unfortunately, I'm still foggy on how OAuth helps me here. Suppose I program so that the API can use Microsoft Graph. However, that means the user still has to sign in twice, first into the PowerApps itself, then in order to access the API since API won't know about the credentials that PowerApps already has? 

Point #1:

I am not sure on this.


Point #2:

You can't directly use Graph API in PowerApps. You need to wrap Graph API inside a Web App and expose it as custom API and use it in PowerApps. As mentioned in the previous posts, you need to enable Easy authentication for Web App's security.

Perumal, I think we're on different page here.


My uncertainty is how would my custom API be able to use Graph API if it must first authenticate the user on a per-user basis and that PowerApps will not pass the existing credentials it already has (from signing the user when they launch the PowerApps). I'm trying to avoid the double login and am content to use the existing credential from PA but I need something more reliable than reading the PowerApps' User object or the token from PA to identify that the caller to the custom API is in fact orignating from the user of the PA. 

I can understand your problem and I tried a PowerApps which connects to a custom API protected with Azure AD authentication last week.


My suggestion is to try the below tutorial first and you can understand how the authentication for custom API works in PowerApps.


I don't find option to pass the token from PowerApps to Graph API wrapped inside the custom API.

Hi @joem 


I maually add cookie/sessionid into header of custom connector, but didn't work any more, even if it works in flow and Postman! 

I also find Authorization header in Request Header, but I didn't choose any authentication type, only 'No Authencation' in Security Tab. 

Could you please help explain why does this happen?




Helpful resources


Community will be READ ONLY July 16th, 5p PDT -July 22nd

Dear Community Members,   We'd like to let you know of an upcoming change to the community platform: starting July 16th, the platform will transition to a READ ONLY mode until July 22nd.   During this period, members will not be able to Kudo, Comment, or Reply to any posts.   On July 22nd, please be on the lookout for a message sent to the email address registered on your community profile. This email is crucial as it will contain your unique code and link to register for the new platform encompassing all of the communities.   What to Expect in the New Community: A more unified experience where all products, including Power Apps, Power Automate, Copilot Studio, and Power Pages, will be accessible from one community.Community Blogs that you can syndicate and link to for automatic updates. We appreciate your understanding and cooperation during this transition. Stay tuned for the exciting new features and a seamless community experience ahead!

Summer of Solutions | Week 4 Results | Winners will be posted on July 24th

We are excited to announce the Summer of Solutions Challenge!   This challenge is kicking off on Monday, June 17th and will run for (4) weeks.  The challenge is open to all Power Platform (Power Apps, Power Automate, Copilot Studio & Power Pages) community members. We invite you to participate in a quest to provide solutions in the Forums to as many questions as you can. Answers can be provided in all the communities.    Entry Period: This Challenge will consist of four weekly Entry Periods as follows (each an “Entry Period”)   - 12:00 a.m. PT on June 17, 2024 – 11:59 p.m. PT on June 23, 2024 - 12:00 a.m. PT on June 24, 2024 – 11:59 p.m. PT on June 30, 2024 - 12:00 a.m. PT on July 1, 2024 – 11:59 p.m. PT on July 7, 2024 - 12:00 a.m. PT on July 8, 2024 – 11:59 p.m. PT on July 14, 2024   Entries will be eligible for the Entry Period in which they are received and will not carryover to subsequent weekly entry periods.  You must enter into each weekly Entry Period separately.   How to Enter: We invite you to participate in a quest to provide "Accepted Solutions" to as many questions as you can. Answers can be provided in all the communities. Users must provide a solution which can be an “Accepted Solution” in the Forums in all of the communities and there are no limits to the number of “Accepted Solutions” that a member can provide for entries in this challenge, but each entry must be substantially unique and different.    Winner Selection and Prizes: At the end of each week, we will list the top ten (10) Community users which will consist of: 5 Community Members & 5 Super Users and they will advance to the final drawing. We will post each week in the News & Announcements the top 10 Solution providers.  At the end of the challenge, we will add all of the top 10 weekly names and enter them into a random drawing.  Then we will randomly select ten (10) winners (5 Community Members & 5 Super Users) from among all eligible entrants received across all weekly Entry Periods to receive the prize listed below. If a winner declines, we will draw again at random for the next winner.  A user will only be able to win once overall. If they are drawn multiple times, another user will be drawn at random.  Individuals will be contacted before the announcement with the opportunity to claim or deny the prize.  Once all of the winners have been notified, we will post in the News & Announcements of each community with the list of winners.   Each winner will receive one (1) Pass to the Power Platform Conference in Las Vegas, Sep. 18-20, 2024 ($1800 value). NOTE: Prize is for conference attendance only and any other costs such as airfare, lodging, transportation, and food are the sole responsibility of the winner. Tickets are not transferable to any other party or to next year’s event.   ** PLEASE SEE THE ATTACHED RULES for this CHALLENGE**   Week 1 Results: Congratulations to the Week 1 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge. Community MembersNumber of SolutionsSuper UsersNumber of Solutions @anandm08  23 @WarrenBelz  31 @DBO_DV  10 @Amik  19 AmínAA 6 @mmbr1606  12 @rzuber  4 @happyume  7 @Giraldoj  3@ANB 6 (tie)   @SpongYe  6 (tie)     Week 2 Results: Congratulations to the Week 2 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge. Community MembersSolutionsSuper UsersSolutions @anandm08  10@WarrenBelz 25 @DBO_DV  6@mmbr1606 14 @AmínAA 4 @Amik  12 @royg  3 @ANB  10 @AllanDeCastro  2 @SunilPashikanti  5 @Michaelfp  2 @FLMike  5 @eduardo_izzo  2   Meekou 2   @rzuber  2   @Velegandla  2     @PowerPlatform-P  2   @Micaiah  2     Week 3 Results: Congratulations to the Week 3 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge.   Week 3:Community MembersSolutionsSuper UsersSolutionsPower Apps anandm0861WarrenBelz86DBO_DV25Amik66Michaelfp13mmbr160647Giraldoj13FLMike31AmínAA13SpongYe27     Week 4 Results: Congratulations to the Week 4 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge.   Week 4:Community MembersSolutionsSuper UsersSolutionsPower Apps DBO-DV21WarranBelz26Giraldoj7mmbr160618Muzammmil_0695067Amik14samfawzi_acml6FLMike12tzuber6ANB8   SunilPashikanti8

Check Out | 2024 Release Wave 2 Plans for Microsoft Dynamics 365 and Microsoft Power Platform

On July 16, 2024, we published the 2024 release wave 2 plans for Microsoft Dynamics 365 and Microsoft Power Platform. These plans are a compilation of the new capabilities planned to be released between October 2024 to March 2025. This release introduces a wealth of new features designed to enhance customer understanding and improve overall user experience, showcasing our dedication to driving digital transformation for our customers and partners.    The upcoming wave is centered around utilizing advanced AI and Microsoft Copilot technologies to enhance user productivity and streamline operations across diverse business applications. These enhancements include intelligent automation, AI-powered insights, and immersive user experiences that are designed to break down barriers between data, insights, and individuals. Watch a summary of the release highlights.    Discover the latest features that empower organizations to operate more efficiently and adaptively. From AI-driven sales insights and customer service enhancements to predictive analytics in supply chain management and autonomous financial processes, the new capabilities enable businesses to proactively address challenges and capitalize on opportunities.    

Updates to Transitions in the Power Platform Communities

We're embarking on a journey to enhance your experience by transitioning to a new community platform. Our team has been diligently working to create a fresh community site, leveraging the very Dynamics 365 and Power Platform tools our community advocates for.  We started this journey with transitioning Copilot Studio forums and blogs in June. The move marks the beginning of a new chapter, and we're eager for you to be a part of it. The rest of the Power Platform product sites will be moving over this summer.   Stay tuned for more updates as we get closer to the launch. We can't wait to welcome you to our new community space, designed with you in mind. Let's connect, learn, and grow together.   Here's to new beginnings and endless possibilities!   If you have any questions, observations or concerns throughout this process please go to   To stay up to date on the latest details of this migration and other important Community updates subscribe to our News and Announcements forums: Copilot Studio, Power Apps, Power Automate, Power Pages

Top Solution Authors
Top Kudoed Authors
Users online (2,308)