doc2 does not execute after doc1

[sohamkumar05]

package main

import(
"net/http"
"io"
)

type statistic struct{
arr string
count int
Mean float32
Median float32
}

var integer []int
var cnt,i int
var sum,median float32

func main() {
http.HandleFunc("/", hello)
http.ListenAndServe(":9999", nil)
}

func hello(w http.ResponseWriter,r http.Request) {
s:= statistic{}
sum=0
w.Header().Set("Content-Type", "text/html")
switch r.Method {
case "GET":
/ display the form to the user */
io.WriteString(w, doc1 );
case "POST":
s.arr=r.FormValue("array")
for i:= range s.arr {
if s.arr[i]==0 {
continue
}
integer[i]=int(s.arr[i])
}
cnt=len(integer)
for i := range integer {
sum+=float32(integer[i])
}
s.count=cnt
s.Mean=float32(sum)/float32(cnt)
i=cnt%2
switch(i) {
case 0:
median=float32(integer[cnt/2]+integer[cnt/2-1])/2.0
break
case 1:
median=float32(integer[(cnt+1)/2])/2.0
break
}
s.Median=median
io.WriteString(w, doc2)
}
}

const doc1=`

<title></title>

Statistics

Computes basic statistics for the given list of numbers

`

const doc2=`

<title></title>

Statistics

Computes basic statistics for the given list of numbers

Numbers	{{.arr}}
Count	{{.count}}
Mean	{{.Mean}}
Median	{{.Median}}

`

for some reason once I click calculate on doc1,doc2 does not show up