FREE OCR API Key is not working

I have register for FREE API key through your website, and my API key has also been generated successfully. While i use, it throws an error : "API Key is not specified. Please provide a valid API key. " Could you please help me out.

Are you getting the same error w/ the test helloworld API key? If so there is something wrong with your API call… probably syntax. Make sure your call is a POST and the API key is in the header.

I have tried all the possible combination.
Could please provide a solution so that i am able to use.
Because the step as i followed on the basis of your code “Helloworld” API has not working.

I attached the snapshot of code.

I am not familiar w/ Python but take a look here and go to the Python code example: