Azure Application Gateway
An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service.
1,079 questions
Removing port from request headers
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Hai Dat
1
Reputation point
Hello everyone,
I am trying to run ruby on rails application in Azure, but came across a small problem.
The app returns "IPAddr::InvalidAddressError", when some headers in HTTP request contain port. So I deployed an application gateway and followed this guide: https://learn.microsoft.com/en-us/azure/application-gateway/rewrite-http-headers#server-variable for removing it. It works fine for originating ip address, but inserts another IPv6 with port (guessing it's an application gateway address or something). Does someone know how to deal with this?
{count} votes
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GitaraniSharma-MSFT 49,581 Reputation points Microsoft Employee2020-08-11T10:22:36.877+00:00 -
Hai Dat 1 Reputation point
2020-08-11T12:12:06.85+00:00 Sure, here it is.
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GitaraniSharma-MSFT 49,581 Reputation points Microsoft Employee
2020-08-11T17:07:26.657+00:00 Thank you for the screenshot @Hai Dat .
{var_add_x_forwarded_for_proxy} just adds to whatever the intermediate proxy sets.
If you just want the client IP, can you use {var_client_ip} instead? -
Hai Dat 1 Reputation point
2020-08-12T10:57:38.817+00:00 Changing the header variable to {var_client_ip} yields the same result. Application gateway is still inserting its IP address with port. I am ok with its IP address but the part with port is what I'd like to remove.
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GitaraniSharma-MSFT 49,581 Reputation points Microsoft Employee
2020-08-13T13:50:22.287+00:00 Thank you for the update @Hai Dat .
If you use {var_client_ip}, then only the client's IP address will be added (previous proxy to AppGw) and not the port.
Is there any proxy after AppGw? That might be adding it. What is your entire request flow?
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GitaraniSharma-MSFT 49,581 Reputation points Microsoft Employee
2020-08-17T09:08:52.45+00:00 Hello @Hai Dat ,
Could you please provide an update on this post and help us with the requested details to investigate further?
Thanks,
Gita -
Hai Dat 1 Reputation point
2020-08-17T12:35:21.637+00:00 Sorry for the late response. The thing is, that I was using App service to deploy my app. My guess is the app service has its own version of application gateway, which is inserting the part with ipv6:port and you can not really customize it. Deploying the app into a azure container instance and putting application gateway in front of it solve the problem.
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GitaraniSharma-MSFT 49,581 Reputation points Microsoft Employee
2020-08-17T13:09:09.127+00:00 Thank you for the update @Hai Dat . Kindly let us know if you need any further assistance on this issue.
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