How do you debug an HTTP Post?

I am using a digital pen from Netpage. It captures information from the pen and sends it to the backend. I need to an HTTP Post to take the infromation captured and send it to a SQL Server, once taken from the server, the information can be sent out via smart phone. My problem is the data is NOT being sent from Netpage to the SQL Server. I need to truble shoot the Http Post to find a soultion to why the data is not being sent correctly.
The first question I will ask is how can I debug an HTTP Post?.. new to this all and unfortunitly our developer is gone and I am the one to have this on my shoulders, any help would be appreciated. Thank you in advance.
julianne26Asked:
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käµfm³d 👽Commented:
Have you heard of Fiddler? It is a utility which will let you inspect the "raw" data that is going across the wire. For example...

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käµfm³d 👽Commented:
...this is what happened when I posted to your question, letting Fiddler view the conversation:

Screenshot
You can see on the left the series of requests that occurred. On the right you can see the raw data that was sent in the request (top) and received in the response (bottom).
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