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Editorial Team
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Asked: 2026-05-27T12:23:42+00:00

I make an AJAX call from JavaScript client (running on machine A) to Web

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I make an AJAX call from JavaScript client (running on machine A) to Web server (running on machine B).
Client tries to access a URL exposed by RESTful Web service (Jersey), and it is blocked with error:

Origin http://localhost/ is not
allowed by
Access-Control-Allow-Origin

In server I added 2 header parameters that allow access to any client. However it didn’t help:

@Context
private HttpServletResponse servlerResponse;

@POST
@Path("testme")
public void test(){
    servlerResponse.addHeader("Access-Control-Allow-Origin", "*");
    servlerResponse.addHeader("Access-Control-Allow-Credentials", "true");
}

The same headers work in case of JSP:

<%
    response.addHeader("Access-Control-Allow-Origin", "*");
    response.addHeader("Access-Control-Allow-Credentials", "true");
%>
<html>
<head><title>test jsp</title></head>
<body>
test
</body>
</html>

Am I missing something?

thanks

P.S the client part is:

$.ajax({
    type: "POST",
    url: "http://localhost:8080/login/testme",
    dataType: 'json',
    success: onLoginSuccess,
    error: onLoginError
});
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1 Answer

  1. Editorial Team

    As a solution, we implemented javax.servlet.Filter that adds required headers to every response:

        public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, java.io.IOException {
    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) resp;

    // This should be added in response to both the preflight and the actual request
    response.addHeader("Access-Control-Allow-Origin", "*");

    if ("OPTIONS".equalsIgnoreCase(request.getMethod())) {
        response.addHeader("Access-Control-Allow-Credentials", "true");
    }

    chain.doFilter(req, resp);
}
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