PHP file does not output JSON format for POST request from C# client

My site : http://pandweighbridge.epizy.com/upload.php gives the correct JSON output when POST request is sent from the browser.
However, when a POST request is sent from a C# client, it gives a HTML output. And it does not contain the JSON data. Please resolve the issue.

Image of the response from the POST request from C# client is here : Imgur: The magic of the Internet

You can’t use a C# client to access your website here, you can only use a regular web browser to access your website. Remote API access is blocked on free hosting.

That means , I have to use SSL to prevent scripts sniffing . That way, no third party can eavesdrop on the communication.

@akkinb said:
That means , I have to use SSL to prevent scripts sniffing . That way, no third party can eavesdrop on the communication.

I don’t follow your reasoning entirely. But yes, SSL will prevent eavesdropping.