Trailing slash forces GET method on request?

server.go

package main

import(    
  "net/http"
  "log"
  "fmt"
)

func route(pattern string, fn func(*http.Request) string){
    http.HandleFunc(pattern,makeHandler(fn))
}

func makeHandler(fn func(*http.Request) (string)) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
    	log.Printf("Request method: %q",r.Method) // Method is always get, regardless of what request actually was
	    h := fn(r)
	    fmt.Fprintf(w,"Handler said: %q",h)
	}

}

func helloHandler(r *http.Request) (view string){    
    view = "Hello, World!"
    return
}

func main(){
    route("/hello/",helloHandler)    
    log.Fatal(http.ListenAndServe(":8080", nil))
}

testform.html

<form action="http://localhost:8080/hello" method="post">
    <input type="hidden" name="testkey" val="testval"/>
    <button type="submit">TEST</button>
</form>