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    <p>When I ran it, I got the following two errors:</p> <pre><code>template: content:6: nil pointer evaluating *main.MechanicInfo.Name http: multiple response.WriteHeader calls </code></pre> <p>The former was in the web browser, the latter in the console window where I launched your server.</p> <p>The nil pointer problem is because your abridged program leaves GameMechanics[1:32] set to nil.</p> <p>The second error is interesting. The only place in your program that any methods on your http.ResponseWriter get called is inside of index.Execute, which is not your code -- meaning maybe there is something wrong happening in html/template. I'm testing this with Go 1.0.2.</p> <p>I put _base.html at the top of index.html and then changed index to this:</p> <pre><code>var index = template.Must(template.ParseFiles("templates/index.html")) </code></pre> <p>and the http.WriteHeaders warning went away.</p> <p>Not really an answer, but a direction you could explore.</p> <p>As a bonus, here's the more "Go way" of writing your program. Note that I simplified the use of the PRNG (you don't need to instantiate unless you want several going in parallel) and simplified the structure initializer:</p> <pre><code>package main import ( "fmt" "html/template" "math/rand" "net/http" ) // Info about a game mechanic type MechanicInfo struct{ Name, Desc string } // Print a mechanic as a string func (m MechanicInfo) String() string { return fmt.Sprintf("%s: %s", m.Name, m.Desc) } // The game mechanics var GameMechanics = [...]*MechanicInfo{ {"Avoiding Unkillable Objects", "There are objects that the player cannot touch. These are different from normal enemies because they cannot be destroyed or moved."}, {"Race", "The player must reach a place before the opponent does. Like \"Timed\" except the enemy as a \"timer\" can be slowed down by the player's actions, or there may be multiple enemies being raced against."}, } // Get a random mechanic func RandMechanic() *MechanicInfo { i := rand.Intn(len(GameMechanics)) return GameMechanics[i] } var index = template.Must(template.ParseFiles("templates/index.html")) func randMechHandler(w http.ResponseWriter, req *http.Request) { mechanics := [3]*MechanicInfo{RandMechanic(), RandMechanic(), RandMechanic()} if err := index.Execute(w, mechanics); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) } } func main() { http.HandleFunc("/", randMechHandler) if err := http.ListenAndServe(":80", nil); err != nil { panic(err) } } </code></pre>
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    1. POWhat is causing my HTTP server to fail with "exit status -1073741819"?
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    1. USJeff Allen
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      1. VTModeratorReview
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    1. COI like your approach for initialization and generation! Much cleaner than what I wrote. I still get the same exit status message when I run it, but `index.Execute` seems like it could be the source; it's a better lead than I had before.
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      1. USKeeblebrox
 

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