업로드 상품등록하기를 누를 시 에러가 발생하고 콘솔에는 아래와 같이 나타납니다.

검색해보니
CORS 정책 어쩌고하면서 서버쪽에 무언갈 허용을 해줘야하는 거같은데&nbsp; 강의에서는 아무 문제없이 돌아가는데 저는 왜 에러가 발생되는 것일까요?
<img src="https://cdn.inflearn.com/public/files/posts/1d4ae73b-2d45-401d-bf2d-60ebbdc0a561/blob" alt="" />

혹시 서버 파일에 cors 처리한 부분이 들어있으신가요~?
<pre class="lang-js s-code-block hljs javascript" style="margin-top: 0px; margin-bottom: calc(var(--s-prose-spacing) + 0.4em); padding: 12px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: 1.30769; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif; font-size: 13px; vertical-align: baseline; box-sizing: inherit; width: auto; max-height: 600px; overflow: auto; border-radius: 5px; color: var(--highlight-color); overflow-wrap: normal;"><code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; box-sizing: inherit; white-space: inherit;">app.use(cors()); 
</code></pre>
<code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; box-sizing: inherit; white-space: inherit;"><span class="hljs-comment" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; box-sizing: inherit; color: var(--highlight-comment);">&nbsp;</code>

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