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Error "Bad Gateway" Error 502



I am using Send an HTTP Request to Sharepoint in my flow to create a SharePoint library. Which was working absolutely fine. It stopped working all of a sudden and started throwing Bad Gateway Error 502.


What I have observed is, the action is creating the library without any issue and automatically attempting to retry second time and then stuck as the library with same name exists and throws error.


I don't understand this behavior.




Library Created successfully and attempting to create.




Please advise if anyone had come across this kind of issue before.


Thank you

Super User
Super User



If the goal is to create a Library, and if the Library already exists you want to instead use the existing one, then it seems you always get the library. Then it seems what you could do is to create a parallel branch and just handle the error case directly - if it is that specific error, then let it pass through to the next step (presuming it is appropriate of course, depends on your set up). 


As for why it is retrying after a successful create, that should not be happening. We would recommend that you attempt to go to Data -> Connections in and remove all the Connections the Flow is using. Especially pay attention to if there are any duplicate connections and remove those too. After you finished doing that, then clear all the cache and cookies on the browser, then open the browser again, sign in, and then go into the Flow again and under each Action sign in again to re-establish the Connection, then save and test the Flow again.


If the issue still persists, that is quite strange. If you still cannot resolve it, maybe a support ticket could help you to gain some more information about your specific case, as we do not experience this kind of behavior when using that Flow Action for Send an HTTP Request to SharePoint. To start a support ticket you (or if needed, your admin) go to  then go to Help + Support, and then click New support request, then follow the instructions to create a new support request.

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