1 발생

WebSecurityConfig 에서
CORS 대한 정책 허용 등을 해준 후에 이런 에러 발생

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2 코드

contactDe-Notice.html:1 
        
       Access to XMLHttpRequest at 'localhost:8080/api/managers/notices/check/2' from origin 'http://127.0.0.1:5500' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, isolated-app, chrome-extension, chrome-untrusted, https, edge.

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3 원인

       var settings = {   
       "url": "localhost:8080/api/managers/notices/check/"+param[1],

url에 http:// 를 제외해서 CORS 에러가 일어남

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4 해결

"url": "http://localhost:8080/api/managers/notices/check/"+param[1],