GetContentLanguage

Reads the response Content-Language header, returning null when it is absent or blank.

The middleware from UseMessageLocalization sets this header from the language message resolution settled on for the request. Multiple languages come back joined by commas rather than as separate values.

Usage

using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using AlmightyShogun.AspNet.Localization;

public sealed class LanguageAuditMiddleware(RequestDelegate next)
{
    public async Task InvokeAsync(
        HttpContext context,
        ILogger<LanguageAuditMiddleware> logger
    )
    {
        await next(context);

        logger.LogDebug(
            "Responded in {Language}",
            context.Response.GetContentLanguage() ?? "unset"
        );
    }
}

Returns

The response Content-Language header when set; otherwise null.

Type signature

public string? GetContentLanguage();