fix: include content-length with bytes payload

actix-http/CHANGES.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Update `TestRequest::set_payload` to generate "Content-Length" header
+
 ## 3.11.0
 
 - Update `brotli` dependency to `8`.

actix-http/src/test.rs

@@ -11,7 +11,7 @@ use std::{
 
 use actix_codec::{AsyncRead, AsyncWrite, ReadBuf};
 use bytes::{Bytes, BytesMut};
-use http::{Method, Uri, Version};
+use http::{header, Method, Uri, Version};
 
 use crate::{
     header::{HeaderMap, TryIntoHeaderPair},
@@ -100,7 +100,9 @@ impl TestRequest {
     /// Set request payload.
     pub fn set_payload(&mut self, data: impl Into<Bytes>) -> &mut Self {
         let mut payload = crate::h1::Payload::empty();
-        payload.unread_data(data.into());
+        let bytes = data.into();
+        self.insert_header((header::CONTENT_LENGTH, bytes.len()));
+        payload.unread_data(bytes);
         parts(&mut self.0).payload = Some(payload.into());
         self
     }