Fortunately APIM provides an easy way to do this.

Steps to log

• Login into the Azure portal and navigate to the specific API Management resource
• Go to settings
• Select the specific API
• On the right hand side, select the settings
• Navigate to Diagnostics Logs
• Check the ‘Enable’ checkbox under Application Insights
• Select the Default sampling rate to 100%
• Set the verbosity to Information
• Set Correlation protocol as W3C
• Go to Advanced Options under Additional settings
• Check the Frontend Request and Frontend Response
• Under the setting for both the Request & Response
• Add “X-Forwarded-For” under the headers
• Add “8192” under the Number of payload bytes to log
• Save the changes
• Navigate to the App Insights
• Open the Live Metrics feature
• Allow the API to be hit
• Go to the logs
• Filter using the API URL
• In the results section under the request body node, you should be able to see the request body
• The same for the response body can be used.

You can also use a query like below to filter the App Insight logs

requests
| where url == <API URL>"
| where timestamp >= ago (1h)
| order by timestamp desc

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