GZIP in .net core not working

Question

I'm attempting to add Gzip middleware to my ASP.net core app.

I have added the following package :

"Microsoft.AspNetCore.ResponseCompression": "1.0.0"

In my startup.cs for the Configure Services method I have the following :

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<GzipCompressionProviderOptions>(options => options.Level = CompressionLevel.Fastest);
    services.AddResponseCompression(options =>
    {
        options.Providers.Add<GzipCompressionProvider>();
    });

    services.AddMvc();
}

In my Configure method I have the following :

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    loggerFactory.AddConsole(Configuration.GetSection("Logging"));
    loggerFactory.AddDebug();

    app.UseResponseCompression();
    app.UseMvc();
}

However when I try and load a page, it doesn't come through as Gzip compressed. I have used both a string response and outputting a view. The response headers in chrome look like :

I am on a windows machine developing in visual studio. When running the app I have tried just running from Visual Studio (Via F5), and also using the "dotnet run" command from command line. Neither output GZip compression.

Answer 1

By placing the UseResponseCompression twice under each other I managed to make it work. I have no idea how this made it work. I am still looking for an accepted solution.

Answer 2

I managed to enable the Response Compression Middleware when using IIS Express by removing

<httpCompression ...> 
...
</httpCompression> 

in .vs\config\applicationhost.config

Answer 3

To Enable GZIP in .net core 2.*
1. Install Microsoft.AspNetCore.ResponseCompression with Install-Package Microsoft.AspNetCore.ResponseCompression command or nuget package manager.
2. Add the following code into Startup.cs

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{

  app.UseResponseCompression();
  app.UseMvc();

}

public void ConfigureServices(IServiceCollection services)
{

  // Configure Compression level
  services.Configure<GzipCompressionProviderOptions>(options => options.Level = CompressionLevel.Fastest);

  // Add Response compression services
  services.AddResponseCompression(options =>
  {
      options.Providers.Add<GzipCompressionProvider>();
      options.EnableForHttps = true;
  });

}

Answer 4

Got this issue resolved by adding response compression option property "EnableForHttps" as shown below:

services.AddResponseCompression(opt =>
        {
            opt.Providers.Add<GzipCompressionProvider>();
            opt.EnableForHttps = true;
        });
 services.Configure<GzipCompressionProviderOptions>(options => options.Level = 
 CompressionLevel.Fastest);