lili lili - 7 months ago 44
Javascript Question

"Access-Control-Allow-Origin:*" has no influence in REST Web Service

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
});

Answer

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);
}