diff --git a/listings/ch20-web-server/listing-20-02/src/main.rs b/listings/ch20-web-server/listing-20-02/src/main.rs
index f139846c6d..1eff2eef3a 100644
--- a/listings/ch20-web-server/listing-20-02/src/main.rs
+++ b/listings/ch20-web-server/listing-20-02/src/main.rs
@@ -14,7 +14,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let http_request: Vec<_> = buf_reader
         .lines()
         .map(|result| result.unwrap())
diff --git a/listings/ch20-web-server/listing-20-03/src/main.rs b/listings/ch20-web-server/listing-20-03/src/main.rs
index c72d4a9c67..17c8401d4d 100644
--- a/listings/ch20-web-server/listing-20-03/src/main.rs
+++ b/listings/ch20-web-server/listing-20-03/src/main.rs
@@ -15,7 +15,7 @@ fn main() {
 
 // ANCHOR: here
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let http_request: Vec<_> = buf_reader
         .lines()
         .map(|result| result.unwrap())
diff --git a/listings/ch20-web-server/listing-20-05/src/main.rs b/listings/ch20-web-server/listing-20-05/src/main.rs
index d4b78b640e..437d9b626e 100644
--- a/listings/ch20-web-server/listing-20-05/src/main.rs
+++ b/listings/ch20-web-server/listing-20-05/src/main.rs
@@ -19,7 +19,7 @@ fn main() {
 
 // ANCHOR: here
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let http_request: Vec<_> = buf_reader
         .lines()
         .map(|result| result.unwrap())
diff --git a/listings/ch20-web-server/listing-20-06/src/main.rs b/listings/ch20-web-server/listing-20-06/src/main.rs
index 5523a42d7c..843d846766 100644
--- a/listings/ch20-web-server/listing-20-06/src/main.rs
+++ b/listings/ch20-web-server/listing-20-06/src/main.rs
@@ -17,7 +17,7 @@ fn main() {
 // --snip--
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     if request_line == "GET / HTTP/1.1" {
diff --git a/listings/ch20-web-server/listing-20-07/src/main.rs b/listings/ch20-web-server/listing-20-07/src/main.rs
index a14b7d538c..e19467b83b 100644
--- a/listings/ch20-web-server/listing-20-07/src/main.rs
+++ b/listings/ch20-web-server/listing-20-07/src/main.rs
@@ -15,7 +15,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     if request_line == "GET / HTTP/1.1" {
diff --git a/listings/ch20-web-server/listing-20-09/src/main.rs b/listings/ch20-web-server/listing-20-09/src/main.rs
index ffc51e803e..0f9356ab02 100644
--- a/listings/ch20-web-server/listing-20-09/src/main.rs
+++ b/listings/ch20-web-server/listing-20-09/src/main.rs
@@ -19,7 +19,7 @@ fn main() {
 fn handle_connection(mut stream: TcpStream) {
     // --snip--
     // ANCHOR_END: here
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
     // ANCHOR: here
 
diff --git a/listings/ch20-web-server/listing-20-10/src/main.rs b/listings/ch20-web-server/listing-20-10/src/main.rs
index 5a18b45c02..0679ec6002 100644
--- a/listings/ch20-web-server/listing-20-10/src/main.rs
+++ b/listings/ch20-web-server/listing-20-10/src/main.rs
@@ -24,7 +24,7 @@ fn handle_connection(mut stream: TcpStream) {
     // --snip--
 
     // ANCHOR_END: here
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     // ANCHOR: here
diff --git a/listings/ch20-web-server/listing-20-11/src/main.rs b/listings/ch20-web-server/listing-20-11/src/main.rs
index 1181357b0e..075a0d9de6 100644
--- a/listings/ch20-web-server/listing-20-11/src/main.rs
+++ b/listings/ch20-web-server/listing-20-11/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 // ANCHOR_END: here
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-12/src/main.rs b/listings/ch20-web-server/listing-20-12/src/main.rs
index 21b9a80f10..bde3e29d10 100644
--- a/listings/ch20-web-server/listing-20-12/src/main.rs
+++ b/listings/ch20-web-server/listing-20-12/src/main.rs
@@ -22,7 +22,7 @@ fn main() {
 // ANCHOR_END: here
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-13/src/main.rs b/listings/ch20-web-server/listing-20-13/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-13/src/main.rs
+++ b/listings/ch20-web-server/listing-20-13/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-14/src/main.rs b/listings/ch20-web-server/listing-20-14/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-14/src/main.rs
+++ b/listings/ch20-web-server/listing-20-14/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-15/src/main.rs b/listings/ch20-web-server/listing-20-15/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-15/src/main.rs
+++ b/listings/ch20-web-server/listing-20-15/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-16/src/main.rs b/listings/ch20-web-server/listing-20-16/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-16/src/main.rs
+++ b/listings/ch20-web-server/listing-20-16/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-17/src/main.rs b/listings/ch20-web-server/listing-20-17/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-17/src/main.rs
+++ b/listings/ch20-web-server/listing-20-17/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-18/src/main.rs b/listings/ch20-web-server/listing-20-18/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-18/src/main.rs
+++ b/listings/ch20-web-server/listing-20-18/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-19/src/main.rs b/listings/ch20-web-server/listing-20-19/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-19/src/main.rs
+++ b/listings/ch20-web-server/listing-20-19/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-20/src/main.rs b/listings/ch20-web-server/listing-20-20/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-20/src/main.rs
+++ b/listings/ch20-web-server/listing-20-20/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-21/src/main.rs b/listings/ch20-web-server/listing-20-21/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-21/src/main.rs
+++ b/listings/ch20-web-server/listing-20-21/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-22/src/main.rs b/listings/ch20-web-server/listing-20-22/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/listing-20-22/src/main.rs
+++ b/listings/ch20-web-server/listing-20-22/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-23/src/main.rs b/listings/ch20-web-server/listing-20-23/src/main.rs
index b6aa046d1b..acd703f274 100644
--- a/listings/ch20-web-server/listing-20-23/src/main.rs
+++ b/listings/ch20-web-server/listing-20-23/src/main.rs
@@ -23,7 +23,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-24/src/main.rs b/listings/ch20-web-server/listing-20-24/src/main.rs
index b6aa046d1b..acd703f274 100644
--- a/listings/ch20-web-server/listing-20-24/src/main.rs
+++ b/listings/ch20-web-server/listing-20-24/src/main.rs
@@ -23,7 +23,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/listing-20-25/src/main.rs b/listings/ch20-web-server/listing-20-25/src/main.rs
index 86e8d9e78c..ee0f1efe74 100644
--- a/listings/ch20-web-server/listing-20-25/src/main.rs
+++ b/listings/ch20-web-server/listing-20-25/src/main.rs
@@ -25,7 +25,7 @@ fn main() {
 // ANCHOR_END: here
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/no-listing-01-define-threadpool-struct/src/main.rs b/listings/ch20-web-server/no-listing-01-define-threadpool-struct/src/main.rs
index f7b42167f9..e68f72c700 100644
--- a/listings/ch20-web-server/no-listing-01-define-threadpool-struct/src/main.rs
+++ b/listings/ch20-web-server/no-listing-01-define-threadpool-struct/src/main.rs
@@ -23,7 +23,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/no-listing-02-impl-threadpool-new/src/main.rs b/listings/ch20-web-server/no-listing-02-impl-threadpool-new/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/no-listing-02-impl-threadpool-new/src/main.rs
+++ b/listings/ch20-web-server/no-listing-02-impl-threadpool-new/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/no-listing-03-define-execute/src/main.rs b/listings/ch20-web-server/no-listing-03-define-execute/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/no-listing-03-define-execute/src/main.rs
+++ b/listings/ch20-web-server/no-listing-03-define-execute/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/no-listing-04-update-worker-definition/src/main.rs b/listings/ch20-web-server/no-listing-04-update-worker-definition/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/no-listing-04-update-worker-definition/src/main.rs
+++ b/listings/ch20-web-server/no-listing-04-update-worker-definition/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/no-listing-05-fix-worker-new/src/main.rs b/listings/ch20-web-server/no-listing-05-fix-worker-new/src/main.rs
index 79efb28a2a..1f075fde59 100644
--- a/listings/ch20-web-server/no-listing-05-fix-worker-new/src/main.rs
+++ b/listings/ch20-web-server/no-listing-05-fix-worker-new/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/no-listing-06-fix-threadpool-drop/src/main.rs b/listings/ch20-web-server/no-listing-06-fix-threadpool-drop/src/main.rs
index b6aa046d1b..acd703f274 100644
--- a/listings/ch20-web-server/no-listing-06-fix-threadpool-drop/src/main.rs
+++ b/listings/ch20-web-server/no-listing-06-fix-threadpool-drop/src/main.rs
@@ -23,7 +23,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/listings/ch20-web-server/no-listing-07-final-code/src/main.rs b/listings/ch20-web-server/no-listing-07-final-code/src/main.rs
index b6aa046d1b..acd703f274 100644
--- a/listings/ch20-web-server/no-listing-07-final-code/src/main.rs
+++ b/listings/ch20-web-server/no-listing-07-final-code/src/main.rs
@@ -23,7 +23,7 @@ fn main() {
 }
 
 fn handle_connection(mut stream: TcpStream) {
-    let buf_reader = BufReader::new(&mut stream);
+    let buf_reader = BufReader::new(&stream);
     let request_line = buf_reader.lines().next().unwrap().unwrap();
 
     let (status_line, filename) = match &request_line[..] {
diff --git a/src/ch20-01-single-threaded.md b/src/ch20-01-single-threaded.md
index 9e7fe865b1..b474d926fe 100644
--- a/src/ch20-01-single-threaded.md
+++ b/src/ch20-01-single-threaded.md
@@ -143,8 +143,8 @@ connection, we now call the new `handle_connection` function and pass the
 `stream` to it.
 
 In the `handle_connection` function, we create a new `BufReader` instance that
-wraps a mutable reference to the `stream`. `BufReader` adds buffering by
-managing calls to the `std::io::Read` trait methods for us.
+wraps a reference to the `stream`. `BufReader` adds buffering by managing calls
+to the `std::io::Read` trait methods for us.
 
 We create a variable named `http_request` to collect the lines of the request
 the browser sends to our server. We indicate that we want to collect these