APIM Add Retry Policy using Policy Fragment
A connection that was expected to be kept alive was closed by the server
We were seeing many API responses with status code 500 in APIM, with Exception type = BackendConnectionFailure:
The underlying connection was closed: A connection that was expected to be kept alive was closed by the server.
Upon investigating further, Microsoft suggest implementing a retry policy: Scenario 5: Unable to connect to the remote server
The Fragment
<fragment>
<retry condition=“@(context.Response.StatusCode == 500)”
count=“5” interval=“10” max-interval=“50” delta=“10” first-fast-retry=“false”>
<forward-request buffer-request-body=“true” />
</retry>
</fragment>
The API Policy
<policies>
<inbound>
<base />
</inbound>
<backend>
<!–<base />–>
<include-fragment fragment-id=“StandardRetry” />
</backend>
<outbound>
<base />
</outbound>
<on-error>
<base />
</on-error>
</policies>
