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Angular HttpClient observer always throws 401

I have a problem with HttpClient. When I try to send a POST request from my frontend, I always receive a 401 Unauthorized error; it doesn’t even reach the endpoint. I tried entering incognito mode to see if it was a cache issue or something similar, but apparently, that’s not the case, as it continues to give me the 401 error without even calling the endpoint. I also tried with Postman, and it works perfectly there.