Querystring issue with .Net Core url rewrite - asp.net-core

Question

Working on an app in ASP.NET Core I am having a problem trying to rewrite a single url like:
https://localhost:44318/Details?content=My-url-to-rewrite&id=221
into
https://localhost:44318/mypage
The code I am using at the beginning of the Configure() method into Startup.cs is the following:
app.UseRewriter(new RewriteOptions()
.AddRewrite(#"^Details?content=My-url-to-rewrite&id=221", "/mypage", skipRemainingRules: true));
The strange thing is that if I try to rewrite the url without the querystring like the following, it works
app.UseRewriter(new RewriteOptions()
.AddRewrite(#"^Details", "/mypage", skipRemainingRules: true));
And even adding the question mark to append the querystring it works, like the following
app.UseRewriter(new RewriteOptions()
.AddRewrite(#"^Details?", "/mypage", skipRemainingRules: true));
But as soon as I add even a single character after the question mark the url is not rewritten and the page gets linked as usually without any error.
Any idea?
Thanks in advance.

Answer 1

You can implement your own ReWrite Middleware :
Configure :
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
....
var options = new RewriteOptions()
.Add(RedirectMyRequests);
app.UseRewriter(options);
...
}
static void RedirectMyRequests(RewriteContext context)
{
var request = context.HttpContext.Request;
// Because we're redirecting back to the same app, stop processing if the request has already been redirected
//If the modified path is similar with previous, add if statemetn to stop processing
//check the request path and request QueryString
if (request.Path.Value.StartsWith("/Details", StringComparison.OrdinalIgnoreCase) && request.QueryString.Value.StartsWith("?content", StringComparison.OrdinalIgnoreCase))
{
if (request.QueryString.Value.Split('&')[1].StartsWith("id", StringComparison.OrdinalIgnoreCase))
{
var response = context.HttpContext.Response;
response.StatusCode = StatusCodes.Status301MovedPermanently;
context.Result = RuleResult.EndResponse;
//change it with needed path, it is combined with request path and request QueryString
response.Headers[HeaderNames.Location] = "/Home/Privacy";
}
}
}