Getting Go's HTTP post to emulate curl -d - go

Question

I am attempting to post content to an nginx server through Go. I have verified that I am able to correctly POST this content through curl, specifically using this command:
$ curl http://example.com/myendpoint -d "Some Text"
I am able to see this POST, and process it correctly. However, when I try to perform a POST with Go, it is rejected by the server. In the nginx access logs, I see these two lines:
127.0.0.1 - - [30/Jan/2014:05:57:34 +0000] "POST /myendpoint HTTP/1.1" 400 0 "-" "Go 1.1 package http"
127.0.0.1 - - [30/Jan/2014:05:57:39 +0000] "Some Text" 400 172 "-" "-"
The code that I have tried is below:
r, err := http.Post(uri, "application/x-www-form-urlencoded", bytes.NewReader(data))
if err != nil {
log.Printf("HTTP NOTIFICATION ERROR: %s\n", err)
return
}
r.Body.Close()
Is there something that I am doing wrong? Thanks!

Answer 1

I can't see any particular issue with the code snippets you provided, but you may not be encoding the data as required by application/x-www-form-urlencoded's specification.
Try using PostForm instead, which will perform this on your behalf:
import (
"net/url"
)
// ...
r, err := http.PostForm(uri, url.Values{"key": {"Value"}, "id": {"123"}})

Answer 2

If it is more convenient for you to convert your post data to []byte, vs url.Values, you can use http.Client. The code below shows how you can use the Client to process a new http request.
var client http.Client
req, err := http.NewRequest("POST", myURL, data) // data is of type []byte
if err != nil {
// todo: do something
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
resp, err := client.Do(req)
if err != nil {
// todo: do something
}
defer resp.Body.Close()
// process your response.