服务器认为所有请求都具有r.Method“ GET”

Question

Edit: solved! The server was redirecting from /whales to /whales/, which transformed the request into a GET. My curl command had the trailing slash, but my form and Postman request did not.

---

My basic server always has "GET" as r.Method, even for post requests from Postman and html forms. r.Form is always an empty map.

My code:

func whaleHandler(w http.ResponseWriter, r *http.Request) {
    fmt.Print(r.Method)
    fmt.Print(r.Form)
}

func main() {
    http.HandleFunc("/whales/", whaleHandler)

    log.Fatal(http.ListenAndServe(":9002", nil))
}

And this prints:

GETmap[]

What am I doing wrong here? Thanks in advance, all!

---

Edit: everything works as expected with curl, but Postman and regular forms are still being treated like GET requests.

curl -d "Name=Barry" -X POST http://localhost:9002/whales/

results in:

POSTmap[],

and r.FormValue("Name") spits out Barry

---

Sample form:

<form action="/whales" method="POST">
<div><input type="text" name="Name" placeholder="Name"></div>
<div><input type="text" name="Length" placeholder="Length"></div>
<div><input type="text" name="Type" placeholder="Type"></div>
<div><input type="submit" value="Save"></div>
</form>

And full output from fmt.Print(r), formatted a little for readability:

&{GET 
/whales/ 
HTTP/1.1 
1 
1 
map[
  Accept:[
    text/html,
    application/xhtml+xml,
    application/xml;q=0.9,*\/*;q=0.8
  ] 
  Accept-Language:[en-US,en;q=0.5] 
  Accept-Encoding:[gzip, deflate] 
  Cookie:[io=08-aNjAMs8v6ntatAAAA] 
  Connection:[keep-alive] 
  Upgrade-Insecure-Requests:[1] 
  User-Agent:[Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:58.0) Gecko/20100101 Firefox/58.0] Referer:[http://localhost:9002/whales/create]
] 
{} 
<nil> 
0 
[] 
false 
localhost:9002 
map[] 
map[] 
<nil> 
map[] 

/whales/ 
<nil> 
<nil> 
<nil> 
0xc420162400}

---

Edit: Sample Postman request, which results in r.Method => "GET" Posting with Postman

Answer 1

You registered your handler under "/whales/", but your form action is "/whales" (without trailing slash). Go will redirect requests from /whales to /whales/ in this configuration -- most clients choose to follow via GET requests.

Either register the handler for "/whales", or change the form action to "/whales/", depending on other URLs you wish to handle. E.g., if you need to handle /whales/willy, leave the handler as-is and change the form action.