Compression not working depeding on User-Agent

[agustins]

I have an Angular application using the new template from net core sdk 2.1.

With this configuration:

public void Configure(IApplicationBuilder app)
{
    app.UseResponseCompression();
    app.UseStaticFiles();
    app.UseSpaStaticFiles();
}

public IServiceProvider ConfigureServices(IServiceCollection services)
{
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
    services.AddResponseCompression();

    // In production, the Angular files will be served from this directory
    services.AddSpaStaticFiles(configuration =>
    {
        configuration.RootPath = "angular/out";
    });
}

if the User-Agent header is present in the header, content is not compressed:

Removing User-Agent header, response is compressed:

[Tratcher]

User agent should not be a factor here. What happens if you don't use UseSpaStaticFiles?

[agustins]

Removing UseSpaStaticFiles the behaviour is the same. I don't know why, but removing "AppleWebKit/537.36 (KHTML, like Gecko)" from User-Agent, works.

[muratg]

Closing this. @agustins please let us know if you have a network trace that you can share.