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So I am making a Restful Webservice with the Springtoolsuite and I am making a Rest Client as well. I am at a point at which I can run the service and have both Postman give me the results I expect as well as run the internal Browser of Spring and have the proper things happening.

However if I then load the html file outside of Springs browser im getting the typical CORS errors of "CORS request did not succeed" and "CORS preflight channel did not succeed" in Mozilla and in Chrome I get a 403 for OPTIONS and "access to XMLHttpRequest at 'http://localhost:8080/.." from origin 'null' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource." which is also a CORS issue.

localhost:8080 is my choice of URL because Apache Tomcat starts the service on this port when I run the project as a Spring Boot App.

What I am unsure of now is how to find out wether I am making poorly worded requests in my Rest Client or wether I have an issue in my servercode for example supposedly the error can come from preflighting multiple times and I am unsure wether I might be doing that.

First the servercode: