Why Am I Getting an \"Access-Control-Allow-Origin\" Header Error When Using AJAX with HTML Base Tags?

XMLHttpRequest Error: 'Access-Control-Allow-Origin' Header Missing

When attempting to make an AJAX request through an HTML base tag, you may encounter an "Access-Control-Allow-Origin" header error. This is because the server needs to explicitly specify that requests from a particular origin are allowed.

Solution:

To resolve this issue, follow these steps:

1. Add the addHeader() method instead of setHeader() to specify the allowed origin.

response.addHeader("Access-Control-Allow-Origin", "*");

• The above line allows access to all domains.

2. For specific domain access only:

response.addHeader("Access-Control-Allow-Origin", "http://www.example.com");

Additional Information:

• For a detailed explanation and examples, refer to the blog post linked in the answer.

Note:

Using * as the allowed origin is not recommended for production environments as it allows access from all domains, which can pose security risks.

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