英文:
Multiple JSON responses to one request
问题
一个错误的uid被传递给了服务器：1
以下代码为单个请求返回了3个JSON响应。
据我理解，一旦响应被写入ResponseWriter，就表示完成了；但这似乎不是真的。
我在哪里可以找到更多关于这个问题的信息，我在这里解决的确切问题是什么？
func getJob(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
vars := mux.Vars(r)
job_id := vars["job_id"]
var job job
// 对UUID job_id进行基本验证
uid, err := uuid.FromString(job_id)
fmt.Println(uid)
fmt.Println(err)
if _, err := uuid.FromString(job_id); err != nil {
sendErrorResponse(w, "Invalid job id "+job_id, err)
}
if result := db.Where("job_id = ?", uid).First(&job); result.Error != nil {
sendErrorResponse(w, "Error retrieving job with "+job_id, result.Error)
}
json.NewEncoder(w).Encode(job)
}
func sendErrorResponse(w http.ResponseWriter, message string, err error) {
w.WriteHeader(http.StatusInternalServerError)
if err := json.NewEncoder(w).Encode(Response{Message: message, Error: err.Error()}); err != nil {
panic(err)
}
}
这是Postman的输出：
{
"Message": "Invalid job id 1",
"Error": "uuid: incorrect UUID length: 1"
}
{
"Message": "Error retrieving job with 1",
"Error": "record not found"
}
{
"ID": 0,
"CreatedAt": "0001-01-01T00:00:00Z",
"UpdatedAt": "0001-01-01T00:00:00Z",
"DeletedAt": null,
"application": "",
"status": "",
"worker": "",
"job_id": "00000000-0000-0000-0000-000000000000"
}
英文:
A wrong uid is passed to the server : 1
The following code returns 3 JSON responses for a single request.
As far as my understanding goes, as soon as the Response is written to the ResponseWriter its done; this doesn't appear to be true.
Where do I read more about this and what's the exact issue I am tackling here?
func getJob(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
vars := mux.Vars(r)
job_id := vars["job_id"]
var job job
// basic validation for UUID job_id
uid, err := uuid.FromString(job_id)
fmt.Println(uid)
fmt.Println(err)
if _, err := uuid.FromString(job_id); err != nil {
sendErrorResponse(w, "Invalid job id "+job_id, err)
}
if result := db.Where("job_id = ?", uid).First(&job); result.Error != nil {
sendErrorResponse(w, "Error retrieving job with "+job_id, result.Error)
}
json.NewEncoder(w).Encode(job)
}
func sendErrorResponse(w http.ResponseWriter, message string, err error) {
w.WriteHeader(http.StatusInternalServerError)
if err := json.NewEncoder(w).Encode(Response{Message: message, Error: err.Error()}); err != nil {
panic(err)
}
}
Here's the output in Postman :
{
"Message": "Invalid job id 1",
"Error": "uuid: incorrect UUID length: 1"
}
{
"Message": "Error retrieving job with 1",
"Error": "record not found"
}
{
"ID": 0,
"CreatedAt": "0001-01-01T00:00:00Z",
"UpdatedAt": "0001-01-01T00:00:00Z",
"DeletedAt": null,
"application": "",
"status": "",
"worker": "",
"job_id": "00000000-0000-0000-0000-000000000000"
}
答案1
得分: 3
所有对http.ResponseWriter的写入都会写入到通过网络传输的响应主体中。当处理程序返回给net/http服务器时，响应完成。
添加返回语句以解决问题。
if _, err := uuid.FromString(job_id); err != nil {
sendErrorResponse(w, "无效的作业ID "+job_id, err)
return
}
if result := db.Where("job_id = ?", uid).First(&job); result.Error != nil {
sendErrorResponse(w, "检索作业时出错 "+job_id, result.Error)
return
}
英文:
All writes to the http.ResponseWriter are written to the response body transmitted over the network. The response is completed when the handler returns to the net/http server.
Add return statements to fix the problem.
if _, err := uuid.FromString(job_id); err != nil {
sendErrorResponse(w, "Invalid job id "+job_id, err)
return
}
if result := db.Where("job_id = ?", uid).First(&job); result.Error != nil {
sendErrorResponse(w, "Error retrieving job with "+job_id, result.Error)
return
}
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