mapo-core/MP.IOC/Services/PreserveBodyTransformer.cs

using Yarp.ReverseProxy.Forwarder;

namespace MP.IOC.Services
{

    public class PreserveBodyTransformer : HttpTransformer
    {
        public override async ValueTask TransformRequestAsync(HttpContext httpContext, HttpRequestMessage proxyRequest, string destinationPrefix, CancellationToken cancellationToken)
        {
            // Chiama il base (usa overload con cancellationToken)
            await base.TransformRequestAsync(httpContext, proxyRequest, destinationPrefix, cancellationToken);

            // Imposta il method correttamente
            proxyRequest.Method = new HttpMethod(httpContext.Request.Method);

            // Se vuoi leggere/loggare il body, abilita buffering e rewind.
            // NON assegnare proxyRequest.Content: YARP copierà il body da HttpContext.Request.
            if (httpContext.Request.ContentLength > 0 || httpContext.Request.Body.CanRead)
            {
                // Abilita buffering solo se necessario (attenzione a payload grandi)
                httpContext.Request.EnableBuffering();

                // Rewind per sicurezza
                httpContext.Request.Body.Position = 0;

                // Se vuoi leggere il body per logging, fallo qui ma non sostituire proxyRequest.Content.
                // Esempio (opzionale): leggere senza consumare
                // using var sr = new StreamReader(httpContext.Request.Body, leaveOpen: true);
                // var bodyText = await sr.ReadToEndAsync();
                // httpContext.Request.Body.Position = 0;
            }
        }

        public override ValueTask<bool> TransformResponseAsync(HttpContext httpContext, HttpResponseMessage? proxyResponse, CancellationToken cancellationToken)
        {
            return base.TransformResponseAsync(httpContext, proxyResponse, cancellationToken);
        }
    }


}