How to force CreatedAtRoute generate location started from https? - asp.net-core-webapi

Question

I do POST to my api
curl -X POST --header 'Content-Type: application/json'
--header 'Accept: application/json'
--header 'Authorization: Bearer some_token' -d '{ some_data }'
'https://here_is_url'
In response I get
{ ... "location": "http://here_is_right_url_except_http", "status": "201", ... }
But url in location header should be with https.
Incoming request hits balancer which is https, then requested goes as http.

Answer 1

Found two ways to solve this issue.
1) Override UrlHelper
public class HttpsUrlHelper : UrlHelper {
public HttpsUrlHelper(ActionContext actionContext)
: base(actionContext) {
}
protected override string GenerateUrl(string protocol, string host, VirtualPathData pathData, string fragment) {
return base.GenerateUrl("https", host, pathData, fragment);
}
}
public class ForcedHttpsUrlHelperFactory : IUrlHelperFactory {
public IUrlHelper GetUrlHelper(ActionContext context) {
return new HttpsUrlHelper(context);
}
}
In Startup.cs need to register it
services.AddSingleton<IUrlHelperFactory, ForcedHttpsUrlHelperFactory>();
2) Create new class for action Result. Also you will need to implement own CreatedAtRoute function which will return instance of HttpsCreatedAtRouteResult.
public class HttpsCreatedAtRouteResult : CreatedAtRouteResult {
public HttpsCreatedAtRouteResult(object routeValues, object value)
: base(routeValues, value) {
}
public HttpsCreatedAtRouteResult(string routeName, object routeValues, object value)
: base(routeName, routeValues, value) {
}
public override void OnFormatting(ActionContext context) {
base.OnFormatting(context);
var url = context.HttpContext.Response.Headers[HeaderNames.Location];
// do with url whatever you need
context.HttpContext.Response.Headers[HeaderNames.Location] = url;
}
}