I’m having trouble connecting to a RapidAPI service using Delphi’s REST component in RAD Studio. Even though I’ve added both the x-rapidapi-key and x-rapidapi-host headers as parameters in my REST component setup, I keep getting a 401 unauthorized error response. I’ve double-checked my API key and it should be valid. Has anyone encountered this issue before when working with RapidAPI endpoints in Delphi? I’m wondering if there’s something specific about how the headers need to be configured in the REST component that I might be missing. Any suggestions on what could be causing this authentication problem would be really helpful.
I’ve experienced a similar issue with RapidAPI and Delphi’s REST component. The key point is to ensure that both the x-rapidapi-key and x-rapidapi-host are added directly to the request headers, rather than as parameters. Additionally, it’s important to verify that you’re utilizing the correct HTTP method since some APIs have strict requirements regarding whether to use GET or POST. Lastly, check your endpoint URL against the API documentation, as discrepancies in format can lead to authentication errors.
Check your content-type header too - some RapidAPI endpoints are picky about that. Also make sure you’re not accidentally putting the key in the request body instead of headers. I did that once and wasted hours debugging it lol. Double check the exact header names in the RapidAPI docs since some APIs use slightly different variations.
Had this exact problem last month with a weather API through RapidAPI. I was setting headers as query parameters instead of actual HTTP headers - that was my mistake. Use the TRESTRequest Headers property, not the Params collection. Also check your API key for hidden characters if you copied it from the dashboard. I’ve seen trailing spaces kill authentication. Some RapidAPI services also need a specific User-Agent header or they’ll reject your request. Test the same endpoint in Postman first to make sure your credentials work outside Delphi.