Setting custom response header with Azure Function in proxies.json - azure

Question

I am trying to add a custom HTTP header to all of my responses of my Azure Functions - lets call it X-Custom. Then I add a proxies.json file like this to my functions project:
{
"$schema": "http://json.schemastore.org/proxies",
"proxies": {
"add-custom-header-to-response": {
"matchCondition": {
"route": "/{*restOfPath}"
},
"responseOverrides": {
"response.headers.X-Custom": "Custom value"
}
}
}
}
And this works as expected, I do get the X-Custom header, but my response content has gone missing. What am I missing in the proxies.json file?
Update
Thanks to Baskar I came to the solution (I was missing backendUri):
{
"$schema": "http://json.schemastore.org/proxies",
"proxies": {
"add-custom-header-to-response": {
"matchCondition": {
"route": "/api/1/{*restOfPath}"
},
"backendUri": "https://localhost/api/1/{restOfPath}",
"responseOverrides": {
"response.headers.X-Custom": "Custom value"
}
}
}
}
Also see:
https://learn.microsoft.com/en-us/azure/azure-functions/functions-proxies#reference-localhost
https://learn.microsoft.com/en-us/azure/azure-functions/functions-proxies#route-template-parameters

Answer 1

Just tested my azure function with the route as "test" and I have overriden my response status code and status description and added custom header. Your proxies.json is missing a function backend url.
{
"$schema": "http://json.schemastore.org/proxies",
"proxies": {
"test": {
"matchCondition": {
"route": "test"
},
"backendUri": "https://testbasenewtest.azurewebsites.net/api/HttpTrigger1",
"responseOverrides": {
"response.statusCode": "200",
"response.statusReason": "Successful Response",
"response.headers.API_Login": "custom"
}
}
}
}