英文:
Posting json data to remote server with http.Post
问题
我被一个看起来非常简单的问题难住了。
我从客户端收到一个 JSON 对象，它看起来像这样：
{
"user": "test@example.com"
}
我只需要将其作为 POST 请求传递给 API 的另一部分。到目前为止，我已经写了以下代码：
// 解码传入的 JSON
decoder := json.NewDecoder(r.Body)
var user UserInformation
err := decoder.Decode(&user)
if err != nil {
log.Println(err)
}
jsonUser, _ := json.Marshal(user)
log.Println(string(jsonUser[:])) // 正确的输出
buffer := bytes.NewBuffer(jsonUser)
log.Println(string(buffer.Bytes()[:])) // 也是正确的
resp, err := http.Post("http://example.com/api/has_publisher", "application/json", buffer)
if err != nil {
log.Println(err)
}
由于我无法在实际系统上测试这个程序，我使用 Wireshark 验证了生成的 POST 请求，结果发现内容丢失，Content-Length 为 0。由于某种原因，http.Post 不会从缓冲区中读取数据。
我在这里漏掉了什么吗？如果有人能指点我正确的方向，我将非常感激。
谢谢！
英文:
I am stumped on what seems like a very simple problem.
I am receiving a json object from a client. It looks like this:
{
"user": "test@example.com"
}
I need to simply pass this on to another part of the api as a POST request. This is what i've got until now:
//Decode incomming json
decoder := json.NewDecoder(r.Body)
var user UserInformation
err := decoder.Decode(&user)
if err != nil {
log.Println(err)
}
jsonUser, _ := json.Marshal(user)
log.Println(string(jsonUser[:])) //Correct output
buffer := bytes.NewBuffer(jsonUser)
log.Println(string(buffer.Bytes()[:])) //Also correct
resp, err := http.Post("http://example.com/api/has_publisher", "application/json", buffer)
if err != nil {
log.Println(err)
}
As I cannot test this program on a live system, I verified the resulting post request with wireshark only to find that the content is missing along with Content-Length being 0. For some reason, http.Post doesn't read from the buffer.
Am i missing something here? I would greatly appreciate if someone could point me in the right direction.
Thanks!
答案1
得分: 2
不应该是根本原因，而是替换
buffer := bytes.NewBuffer(jsonUser)
为
buffer := bytes.NewReader(jsonUser)
更有可能是你的测试设置是根本原因。我猜你指向了一个不存在的端点。这会导致在实际的HTTP POST发送之前失败（TCP SYN失败）。
检查一下是否可以使用mockable.io作为替代来模拟你的后端。
英文:
Shouldn`t be the root cause but replace
buffer := bytes.NewBuffer(jsonUser)
with
buffer := bytes.NewReader(jsonUser)
It is more likely that your test setup is the root cause. I assume you are pointing to a non-existing endpoint. This would result in a failure (TCP SYN fails) before the actual HTTP POST is send.
Check if you can use mockable.io as an alternative to mock your backend.
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