Supertest fails on Content-Type

Supertest says the content-type is text/plain, but when I use Postman or Chrome devtools and check the network tab, it correctly shows the content-type as text/html.

describe('Core controller unit tests:', function() {
    before(function(done) {
        request = request('http://localhost:3001');

        done();
    });

    describe('Loading the homepage', function() {
        it('should return 200 from GET /', function(done) {
            request
                .get('/')
                .expect('Content-Type', /html/)
                .expect(200, done);
        });
    });

    after(function(done) {
        done();
    });
});

[trainiac]

+1 always getting “text/html; charset=utf-8” no matter what I do.

    it('should respond with a 200 if the posted body is valid', function(done) {
        request(app)
            .post('/user/', {
                json: true,
                body: helpers.getUser()
            })
            .set('Accept', 'application/json')
            .expect('Content-Type', /json/)
            .expect(function(response) {
                debugger;
                response.res.json.id.should.eql('123');
            })
            .expect(200)
            .end(done);
    });

app.post('/user/', validate({body: helpers.getUserSchema()}), function(req, res) {
   res.set('Content-Type', 'applicaton/json'); 
   res.json({
        id: '1234'
    });
});

[akotranza]

Had this error in an older project using https://www.npmjs.com/package/express-force-https … not a very popular package, but it will cause Express to always return 302 with html/text when using Supertest. With the tests expecting Content-Type of /json/ of course. Easy fix was to not use this package in test env. Commenting here in the off chance it saves someone else several hours of googling and debugging.