diff --git a/api.go b/api.go
index 7e34b2b..debc0a8 100644
--- a/api.go
+++ b/api.go
@@ -46,6 +46,8 @@ type Config struct {
 	// DisableNoContent controls whether a nil or zero value response should
 	// automatically return 204 No Content with an empty body.
 	DisableNoContent bool
+
+	ForceDefaultEncoding bool
 }
 
 // New creates a new API instance.
@@ -126,24 +128,30 @@ func (r *API) RequestHandler() fasthttp.RequestHandler {
 	}
 
 	return func(ctx *fasthttp.RequestCtx) {
-		ct := ctx.Request.Header.ContentType()
-		if len(ct) == 0 || bytes.HasPrefix(ct, anyEncoding) {
-			ctx.Request.Header.SetContentType(r.config.DefaultEncoding)
-		}
+		contentType := ctx.Request.Header.ContentType()
+		accept := ctx.Request.Header.Peek(fasthttp.HeaderAccept)
 
-		ac := ctx.Request.Header.Peek(fasthttp.HeaderAccept)
-		if len(ac) == 0 || bytes.HasPrefix(ac, anyEncoding) {
+		if r.config.ForceDefaultEncoding {
+			ctx.Request.Header.SetContentType(r.config.DefaultEncoding)
 			ctx.Request.Header.Set(fasthttp.HeaderAccept, r.config.DefaultEncoding)
+		} else {
+			if len(contentType) == 0 || bytes.HasPrefix(contentType, anyEncoding) {
+				ctx.Request.Header.SetContentType(r.config.DefaultEncoding)
+			}
+			if len(accept) == 0 || bytes.HasPrefix(accept, anyEncoding) {
+				ctx.Request.Header.Set(fasthttp.HeaderAccept, r.config.DefaultEncoding)
+			}
 		}
 
 		h(ctx)
 
 		// Content-Length of -3 means handler returned nil.
 		if ctx.Response.Header.ContentLength() == -3 {
-			ctx.Response.Header.SetContentLength(0)
-
-			if !r.config.DisableNoContent {
-				ctx.Response.SetBody(nil)
+			if r.config.DisableNoContent {
+				ctx.Response.Header.SetContentLength(len(ctx.Request.Body()))
+			} else {
+				ctx.Response.Header.SetContentLength(0)
+				ctx.Response.ResetBody()
 
 				if ctx.Response.StatusCode() == fasthttp.StatusOK {
 					ctx.Response.SetStatusCode(fasthttp.StatusNoContent)