How to add custom http header in response from Azure function

Question

I am trying azure function (nodejs) with google authentication from a client side javascript app. I have set up CORS for the correct URL(i.e. http://localhost:8080). But I am still getting the following error:

Credentials flag is 'true', but the 'Access-Control-Allow-Credentials' header is ''. It must be 'true' to allow credentials. Origin 'http://localhost:8080' is therefore not allowed access.

I have tried everywhere on the internet and spent few days to get the answers myself. It seems Azure http response needs to add this Access-Control-Allow-Credentials:true in the header. Is there a way to add custom headers?

Any help will be greatly appreciated.

@Thomas, yes nodejs at server side and javascript fetch at client side. — Sofa Gum

mathewc mathewc · Accepted Answer · 2016-08-31T03:28:11

In a Node function you can specify additional headers as follows:

module.exports = function (context, req) {
    context.res = {
        status: 200,
        body: "Hello " + req.query.name,
        headers: {
            'Content-Type': 'text/plain',
            'MyCustomHeader': 'Testing'
        }
    };
    context.done();
}

How to add custom http header in response from Azure function

2 Answers