It seems that customClient.Do needs a http.Request, not your Request (what's
that?)
```
request, err := http.NewRequest("POST",
"https://api.sendgrid/com/v3/mail/send";, strings.NewReader(` {
"personalizations": [
{
"to": [
{
"email": "`+user_email+`"
}
],
"substitutions" : {
"-username-" : "`+username+`",
"-code-" : "`+user_code+`",
"-email-" : "`+user_email+`"
}
}
],
"from": {
"email": "noreply@"
},
"template_id" : "f69ce275-2421-4fca-beb0-247482ea3af0"
}`),
)
if err != nil {
log.Fatal(err)
}
req.Header["Authorization"] = "Bearer api_key"
req.Header["User-Agent"] = "sendgrid/3.1.0o"
req.Header["Accept"] = "application/json"
customClient := urlfetch.Client(appengine.NewContext(r))
response, err := customClient.Do(request)
```
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