ch8: add ch8-stdlib example

Author: timClicks

ch8/ch8-stdlib/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "ch8-stdlib"
+version = "0.1.0"
+authors = ["Tim McNamara <author@rustinaction.com>"]
+edition = "2018"
+
+[dependencies]

ch8/ch8-stdlib/src/main.rs

@@ -0,0 +1,32 @@
+use std::io::prelude::*;
+use std::net::TcpStream;
+
+fn main() -> std::io::Result<()> {
+  let mut connection =
+    TcpStream::connect("www.rustinaction.com:80")?; // We need to specify the port (80) explicitly,
+                                                    // TcpStream does not know that this will become a
+                                                    // HTTP request.
+
+  connection.write_all(b"GET / HTTP/1.0")?; // GET is the HTTP method, / is the resource we're
+                                            // attempting to access and HTTP/1.0 is the protocol
+                                            // version we're requesting. Why 1.0? It does not
+                                            // support "keep alive" requests, which will allow
+                                            // our stream to close without difficulty.
+  connection.write_all(b"\r\n")?; // In many networking protocols, \r\n is how a new
+                                  // lines
+  connection
+    .write_all(b"Host: www.rustinaction.com")?; // The hostname provided on line 5 is actually
+                                                // discarded once it is converted to an IP address.
+                                                // The Host HTTP header allows the server to know
+                                                // which host we're connecting to..
+  connection.write_all(b"\r\n\r\n")?; // Two blank lines signifies that we've finished the
+                                      // request.
+
+  std::io::copy(
+    &mut connection,
+    &mut std::io::stdout(),
+  )?; // std::io::copy() streams bytes from a Reader to a
+      // Writer.
+
+  Ok(())
+}