How can I get the raw body content of a post or put request in the .net minimal API?

Question

How can I get the raw body content of a post or put request in the .net minimal API?

I tried it like this:

app.MapPut($"/{controllerName}", async ([FromBody] BasisTypeDto dto, IRepository repo, HttpRequest request, HttpContext context) => {

    BuilderMinimalApiActionResult<object>.MakeActionResult(Crud.Update(dto, repo, host, DefaultElasticIndex)); }
)
    .AddEndpointFilter(async (efiContext, next) => {

        var s = efiContext.HttpContext.Features.Get<IHttpBodyControlFeature>();

        s.AllowSynchronousIO = true;
        var reader = new StreamReader(efiContext.HttpContext.Request.Body);

        var rawMessage = reader.ReadToEnd();
        return await next(efiContext);
    })

But in rawMessage I get an empty string, although the length of efiContext.HttpContext.Request.ContentLength == 112

Answer 1

The request body could be read only once. If you want to read multiple times, you should enable the buffering.

More details, you could refer to below codes:

app.Use(async (context, next) =>
{
    context.Request.EnableBuffering(); // Allows request body to be read multiple times
    await next();
});
app.MapPut("/test", async ([FromBody] BasisTypeDto dto) =>
{
 
    return new OkResult();
}).AddEndpointFilter(async (efiContext, next) => {

    //var s = efiContext.HttpContext.Features.Get<IHttpBodyControlFeature>();
    efiContext.HttpContext.Request.Body.Position = 0;
    //s.AllowSynchronousIO = true;
    var reader = new StreamReader(efiContext.HttpContext.Request.Body);

    var rawMessage = reader.ReadToEnd();
    return await next(efiContext);
});

Result: