Azure Front Door
An Azure service that provides a cloud content delivery network with threat protection.
Can you let us know if websockets will be coming to AFD?
Azure Front Door - Web Socket Connectivity Issue
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Amit-J
341
Reputation points
Hi,
I have an end point exposed on 443 in front door which is configured to forward the traffic to backend (application Gateway) on 444.
Will websocket connectivity work in this case ?
I see error 400 bad Request which invoking the Front Door end point via Web socket in postman.
It is not able to establish the connection.
But, if I try another end point, it also does not work but I get 200 in response.
I know web socket expects only 101 but if 200 is returned then it means that my request was able to reach till Application Gateway and beyond.. so port 444 is not the blocker here.
But, if I invoke the end point in Application gateway on 443, it is successfully able to establish the web socket connection via postman.
So, please guide if Front Door does not support web socket or all the backends must use 443 for web socket to work ?
Azure Front Door
Azure Application Gateway
Azure Application Gateway
An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service.
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Varun Deepak Jagadeesh (Nallas) 5 Reputation points2024-02-15T05:49:15.9566667+00:00 Whether Websocket feature enabled in AFD?
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3 answers
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(67.2, 74%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EGI%3C/text%3E%3C/svg%3E)
Gearóid Maguire 20 Reputation points2023-01-25T21:56:48.0666667+00:00 -
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mms 0 Reputation points2023-09-09T14:51:09.84+00:00 This seems like an obvious required feature... unless this is just a one way CDN?
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Jessie Jia 0 Reputation points Microsoft Employee2024-11-12T07:40:02.78+00:00 Azure Front Door announced the public preview of WebSocket today. Check details in https://learn.microsoft.com/en-us/azure/frontdoor/standard-premium/websocket.
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ChaitanyaNaykodi-MSFT 27,666 Reputation points Microsoft Employee Moderator2022-10-17T20:52:29.673+00:00 Hello @Amit-J , thank you for reaching out.
Currently Azure Front Door does not support WebSockets, it will help if you could upvote this similar feature request on the Azure Feedback portal. I have also highlighted this feedback to the team internally.
Azure Application Gateway provides native support for WebSocket across all gateway sizes. As per the documentation here you need to configure a standard HTTP listener on port 80 or 443 to receive WebSocket traffic.
Hope this helps! Please let me know if you have any additional questions here.
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Amit-J 341 Reputation points
2022-10-18T06:08:21.423+00:00 Hi, Thanks for the confirmation that web socket is not supported in front door but still I have a doubt in the handshake process at front door.
Since, I receive 200 response for some endpoints, that does mean that front door is able to forward the request to the backend with ease and not stopping the web socket connection at front door.
Is this the expected flow ?Also, 444 port on App gateway is used in the flow, which is also working fine that's why 200 response was returned.
So does this 443 theory holds good here ?I am just curious to understand the handshake mechanism here.
If web socket is not supported then front door should have blocked the request with a proper error instead of routing the request to the backend ?
Please guide. -
ChaitanyaNaykodi-MSFT 27,666 Reputation points Microsoft Employee Moderator
2022-10-19T23:13:17.693+00:00 Hello @Amit-J ,
Apologies for the delay. I think we should be able to get more information if you can check your web-socket connection details? You can do it using your browser's developer tools. For chrome browser you can follow this document.
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hbertsch 6 Reputation points2023-08-14T12:29:33.5533333+00:00 is there any update on the status of WebSockets via Frontdoor? We are currently running into the same issue.
Edit: just saw that the most current feedback from 11.August 2023 in https://feedback.azure.com/d365community/idea/c8b1d257-8a26-ec11-b6e6-000d3a4f0789 says that there still is no WS support ....
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mms 0 Reputation points
2023-09-09T14:44:20.9333333+00:00 Needs WebSocket support from Edge to Origin! Otherwise we need to deploy other multi region solution.
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