dynamic host for swagger ui 3.x

change_swagger_host.js

// not the most elgant way but it works 

// Modified to poll until the spec has loaded and then update to the current URL.
// Useful for microservices where you deploy the swagger-ui as part of the bundle and 
// the Scheme/Hostname/Port are not know at runtime (for example, because they are being hosted by 
// Docker, Kubernetes etc...)

function changeSwagger() {
    // Try to get the Spec
    var newspec = ui.spec().toJSON().resolved;

    // If the spec has not been loaded yet, delay and try again
    if (newspec == null || newspec.host == null) {
        setTimeout(function () { changeSwagger(); }, 100);
        return;
    }

    // We want the spec reflect our current server protocol/location/port
    var scheme = location.protocol;
    var host = location.hostname + (location.port ? ':' + location.port : '');

    newspec.scheme = [scheme] || newspec.scheme;
    newspec.host = host || newspec.host;

    // If you need to change your path, do so here
    // newspec.basePath = newspec.basePath;

    ui.getStore().dispatch({type: 'set_scheme', payload: {scheme: newspec.scheme[0]}})
    ui.getStore().dispatch({type: 'spec_update_resolved', payload: newspec})
}

changeSwagger();