Added Content-Length header to Ch 20-01 listings.

listings/ch20-web-server/listing-20-07/src/main.rs

@@ -33,10 +33,15 @@ fn handle_connection(mut stream: TcpStream) {
     // ANCHOR: here
     // --snip--
     } else {
-        let status_line = "HTTP/1.1 404 NOT FOUND\r\n\r\n";
+        let status_line = "HTTP/1.1 404 NOT FOUND";
         let contents = fs::read_to_string("404.html").unwrap();
 
-        let response = format!("{}{}", status_line, contents);
+        let response = format!(
+            "{}\r\nContent-Length: {}\r\n\r\n{}",
+            status_line,
+            contents.len(),
+            contents
+        );
 
         stream.write(response.as_bytes()).unwrap();
         stream.flush().unwrap();

listings/ch20-web-server/listing-20-09/src/main.rs

@@ -27,14 +27,19 @@ fn handle_connection(mut stream: TcpStream) {
 
     // ANCHOR: here
     let (status_line, filename) = if buffer.starts_with(get) {
-        ("HTTP/1.1 200 OK\r\n\r\n", "hello.html")
+        ("HTTP/1.1 200 OK", "hello.html")
     } else {
-        ("HTTP/1.1 404 NOT FOUND\r\n\r\n", "404.html")
+        ("HTTP/1.1 404 NOT FOUND", "404.html")
     };
 
     let contents = fs::read_to_string(filename).unwrap();
 
-    let response = format!("{}{}", status_line, contents);
+    let response = format!(
+        "{}\r\nContent-Length: {}\r\n\r\n{}",
+        status_line,
+        contents.len(),
+        contents
+    );
 
     stream.write(response.as_bytes()).unwrap();
     stream.flush().unwrap();

src/ch20-01-single-threaded.md

@@ -390,10 +390,10 @@ indicating the response to the end user.
 error page if anything other than */* was requested</span>
 
 Here, our response has a status line with status code 404 and the reason
-phrase `NOT FOUND`. We’re still not returning headers, and the body of the
-response will be the HTML in the file *404.html*. You’ll need to create a
-*404.html* file next to *hello.html* for the error page; again feel free to use
-any HTML you want or use the example HTML in Listing 20-8.
+phrase `NOT FOUND`. The body of the response will be the HTML in the file
+*404.html*. You’ll need to create a *404.html* file next to *hello.html* for
+the error page; again feel free to use any HTML you want or use the example
+HTML in Listing 20-8.
 
 <span class="filename">Filename: 404.html</span>