Update code sections to use google's prettify

posts/basic-http-routing-in-golang.md

@@ -18,21 +18,23 @@ The accompanying repo for the code produced in this article is located [on githu
 
 Here is our basic folder structure for this basic http routing example:
 
-        basic-http-routing-in-golang/
-            main.go
+<pre class="prettyprint"><code>    basic-http-routing-in-golang/
+        main.go
+</pre></code>
 
 As a starting point our `main.go` file looks like this:
 
-        package main
+<pre class="prettyprint"><code class="language-go">    package main
 
-        import (
-            "fmt"
-            _ "net/http"
-        )
+    import (
+        "fmt"
+        _ "net/http"
+    )
 
-        func main() {
-            fmt.Println("Hello HTTP")
-        }
+    func main() {
+        fmt.Println("Hello HTTP")
+    }
+</pre></code>
 
 ### Step 2 ###
 
@@ -40,13 +42,15 @@ Now starting at a very basic level, we can leverage the [`http.HandleFunc`](http
 
 It is very simple to use and its signature is easy to understand.
 
-        func HandleFunc(pattern string, handler func(ResponseWriter, *Request))
+<pre class="prettyprint"><code class="language-go">    func HandleFunc(pattern string, handler func(ResponseWriter, *Request))
+</pre></code>
 
-Which basically means, `http.HandleFunc("/url", routingFunction)` where `routingFunction` looks like this:
+Which basically means, <code class="prettyprint">http.HandleFunc("/url", routingFunction)</code> where `routingFunction` looks like this:
 
-        func routingFunction(w http.ResponseWriter, req *http.Request) {
-            fmt.Fprint(w, "Hello HTTP")
-        }
+<pre class="prettyprint"><code class="language-go">    func routingFunction(w http.ResponseWriter, req *http.Request) {
+        fmt.Fprint(w, "Hello HTTP")
+    }
+</pre></code>
 
 With `fmt.Fprint()` we can pass an `http.ResponseWriter` and a message to display.  Our browser will now look like this when we visit the `/url` endpoint.
 
@@ -54,22 +58,23 @@ With `fmt.Fprint()` we can pass an `http.ResponseWriter` and a message to displa
 
 Here is what `main.go` looks like at this point:
 
-        package main
+<pre class="prettyprint"><code class="language-go">    package main
 
-        import (
-            "fmt"
-            "log"
-            "net/http"
-        )
+    import (
+        "fmt"
+        "log"
+        "net/http"
+    )
 
-        func main() {
-            http.HandleFunc("/hello", helloHTTP)
-            log.Fatal(http.ListenAndServe(":8080", nil))
-        }
+    func main() {
+        http.HandleFunc("/hello", helloHTTP)
+        log.Fatal(http.ListenAndServe(":8080", nil))
+    }
 
-        func helloHTTP(w http.ResponseWriter, req *http.Request) {
-            fmt.Fprint(w, "Hello HTTP")
-        }
+    func helloHTTP(w http.ResponseWriter, req *http.Request) {
+        fmt.Fprint(w, "Hello HTTP")
+    }
+</pre></code>
 
 Now we could stop there, as this is a "basic" http routing example, but I think it isn't quite useful as an example yet, until we start to see something slightly more practical.
 
@@ -77,33 +82,35 @@ Now we could stop there, as this is a "basic" http routing example, but I think
 
 So let's add a `NotFound` page when we don't match a pattern in `HandleFunc`.  It's as simple as:
 
-        func notFound(w http.ResponseWriter, req *http.Request) {
-            http.NotFound(w, req)
-        }
+<pre class="prettyprint"><code class="language-go">    func notFound(w http.ResponseWriter, req *http.Request) {
+        http.NotFound(w, req)
+    }
+</pre></code>
 
 Here is what `main.go` looks like after that:
 
-        package main
+<pre class="prettyprint"><code class="language-go">    package main
 
-        import (
-            "fmt"
-            "log"
-            "net/http"
-        )
+    import (
+        "fmt"
+        "log"
+        "net/http"
+    )
 
-        func main() {
-            http.HandleFunc("/hello", helloHTTP)
-            http.HandleFunc("/", notFound)
-            log.Fatal(http.ListenAndServe(":8080", nil))
-        }
+    func main() {
+        http.HandleFunc("/hello", helloHTTP)
+        http.HandleFunc("/", notFound)
+        log.Fatal(http.ListenAndServe(":8080", nil))
+    }
 
-        func helloHTTP(w http.ResponseWriter, req *http.Request) {
-            fmt.Fprint(w, "Hello HTTP")
-        }
+    func helloHTTP(w http.ResponseWriter, req *http.Request) {
+        fmt.Fprint(w, "Hello HTTP")
+    }
 
-        func notFound(w http.ResponseWriter, req *http.Request) {
-            http.NotFound(w, req)
-        }
+    func notFound(w http.ResponseWriter, req *http.Request) {
+        http.NotFound(w, req)
+    }
+</pre></code>
 
 This will match `/hello` and use the `HelloHTTP` method to print "Hello HTTP" to the browser.  Any other URLs will get caught by the `/` pattern and be given the `http.NotFound` response to the browser.
 
@@ -115,21 +122,23 @@ We need to give ourselves something more specific than the simple contrived `/he
 
 We'll start by creating a new method for this GET request called `userProfile`:
 
-        func userProfile(w http.ResponseWriter, req *http.Request) {
-            userID := req.URL.Path[len("/user/"):]
-            fmt.Fprintf(w, "User Profile: %q", userID)
-        }
+<pre class="prettyprint"><code class="language-go">    func userProfile(w http.ResponseWriter, req *http.Request) {
+        userID := req.URL.Path[len("/user/"):]
+        fmt.Fprintf(w, "User Profile: %q", userID)
+    }
+</pre></code>
 
 Notice that we get the URL from the `req` variable and we treat the string returned from `req.URL.Path` as a byte slice to get everything after the `/user/` in the string.  **Note: this isn't fool proof, `/user/10ok` would get matched here, and we would be assigning `userID` to `"10ok"`.**
 
 Let's add this new route in our `main` function:
 
-        func main() {
-            http.HandleFunc("/hello", helloHTTP)
-            http.HandleFunc("/user/", userProfile)
-            http.HandleFunc("/", notFound)
-            log.Fatal(http.ListenAndServe(":8080", nil))
-        }
+<pre class="prettyprint"><code class="language-go">    func main() {
+        http.HandleFunc("/hello", helloHTTP)
+        http.HandleFunc("/user/", userProfile)
+        http.HandleFunc("/", notFound)
+        log.Fatal(http.ListenAndServe(":8080", nil))
+    }
+</pre></code>
 
 _Note: that this pattern `/user/` matches the trailing `/` so that a call to `/user` in the browser would return a `404 Not Found`._
 
@@ -137,27 +146,29 @@ _Note: that this pattern `/user/` matches the trailing `/` so that a call to `/u
 
 Ok, so we have introduced some pretty severe holes in the security of our new HTTP router.  As mentioned in a note above, treating the `req.URL.Path` as a byte slice and just taking the last half is a terrible idea.  So let's fix this:
 
-        var validPath = regexp.MustCompile("^/(user)/([0-9]+)$")
+<pre class="prettyprint"><code class="language-go">    var validPath = regexp.MustCompile("^/(user)/([0-9]+)$")
 
-        func getID(w http.ResponseWriter, req *http.Request) (string, error) {
-            m := validPath.FindStringSubmatch(req.URL.Path)
-            if m == nil {
-                http.NotFound(w, req)
-                return "", errors.New("Invalid ID")
-            }
-            return m[2], nil // The ID is the second subexpression.
+    func getID(w http.ResponseWriter, req *http.Request) (string, error) {
+        m := validPath.FindStringSubmatch(req.URL.Path)
+        if m == nil {
+            http.NotFound(w, req)
+            return "", errors.New("Invalid ID")
         }
+        return m[2], nil // The ID is the second subexpression.
+    }
+</pre></code>
 
 Now we can use this method in our code:
 
-        func userProfile(w http.ResponseWriter, req *http.Request) {
-            userID, err := getID(w, req)
-            if err != nil {
-                return
-            }
-            fmt.Fprintf(w, "User Profile: %q", userID)
+<pre class="prettyprint"><code class="language-go">    func userProfile(w http.ResponseWriter, req *http.Request) {
+        userID, err := getID(w, req)
+        if err != nil {
+            return
         }
+        fmt.Fprintf(w, "User Profile: %q", userID)
+    }
+</pre></code>
 
 ## Conclusion ##
 
-For now, I'm calling this "Basic HTTP Routing in Golang" article finished.  But I do plan to add more to it as time allows.  Additionally, I'd like to create a more advanced article that discusses the ability to respond to not only GET requests, but also POST, PUT, and DELETE HTTP methods.  Look for an "Advanced HTTP routing in Golang" article in the future.  Thanks for reading this far.  I wish you well in your Go endeavors.
+For now, I'm calling this "Basic HTTP Routing in Golang" article finished.  But I do plan to add more to it as time allows.  Additionally, I'd like to create a more advanced article that discusses the ability to respond to not only GET requests, but also POST, PUT, and DELETE HTTP methods.  Look for an "Advanced HTTP routing in Golang" article in the future.  Thanks for reading this far.  I wish you well in your Go endeavors.