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cache-control is not allowed by Access-Control-Allow-Headers in preflight response #1408

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dalesupa22 opened this issue Apr 25, 2023 · 1 comment

dalesupa22 commented Apr 25, 2023 •

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Hi guys,

I am trying to validate a valid json Blockcerts credential V2 and Im getting the following error:

Access to XMLHttpRequest at 'https://api.etherscan.io/api?module=proxy&action=eth_getTransactionByHash&txhash=0x21a53b030da894ce42b1f18483bc59ef4c3e8f9d2b5b36b3769954487fe73b2b&apikey=XXXXXXXXXXXXXX' from origin 'https://www.blockcerts.org/' has been blocked by CORS policy: Request header field cache-control is not allowed by Access-Control-Allow-Headers in preflight response.

After a long time dealing with it... I found that the problem🐞🐞🐞 was the following code:

.setRequestHeader("Cache-Control","no-cache, no-store, max-age=0")

Please remove this part from the code in order to make it work again.

Member

lemoustachiste commented Jun 28, 2023

Hi @dalesupa22,

I think this issue has been resolved although I found out about it through another channel.

Do you mind checking again if it has been fixed for you?

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