Troubleshooting API Issues with Fiddler: A Comprehensive Guide

Introduction

In this blog post, we will explore the process of troubleshooting issues using Fiddler. Often, when working with APIs in BizTalk, you may encounter errors that do not occur when using Postman. To further investigate and resolve these issues, we can utilize Fiddler by installing it in BizTalk and making necessary configuration changes. This blog post will guide you through the details of this troubleshooting process.

Steps

  • Open fiddler as admin
  • Go to Tools → Options → Connections.


  • In the Connections settings, you will notice that Fiddler listens on port number 8888.
  • We need to configure the same port number in the send port proxy configuration in BizTalk.


  • Once the port number is configured, you can drop a message in the receive location to trigger the integration, which will make the API call. By using Fiddler, we should be able to observe the request and response messages.


  • Now, let's explore how to configure the proxy in Postman. Please refer the figure


Conclusion

By following these steps, you will be equipped with the necessary knowledge to troubleshoot API issues effectively using Fiddler and successfully configure the proxy in Postman.

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