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You are not formatting your TStringstream data correctly. It is not even close to being JSON (despite your variable name). And you are also not setting the TIdHTTP.Request.ContentType property so the server knows what kind of data you are actually sending.

If you read the Slim documentation, Slim supports the following media types out of the box:

• application/x-www-form-urlencoded
• application/json
• application/xml & text/xml

The data you are trying to send is closest to application/x-www-form-urlencoded. That is normally sent using TIdHTTP.Post() instead of TIdHTTP.Put(), by giving it a TStrings object of name=value pairs. Post() will format the values in the application/x-www-form-urlencoded format for you, and set the Request.ContentType property to match.

Your PHP is expecting a PUT request instead of a POST request. Per the Slim documentation, you can actually send a POST request and make it act like a PUT request, by either:

• including a _METHOD=PUT value in your data (application/x-www-form-urlencoded only)

• including an X-HTTP-Method-Override: PUT HTTP request header (works with any media type).

Try something more like this: