我正在使用Echo制作一个简单的REST API，我有一个变量，它是下面的Map，基于我制作的这个结构体：

type Checklist struct {
        ID         int      `json:"id"`
        Title      string   `json:"title"`
        Lines      []string `json:"lines"`
        AuthorName string   `json:"authorName"`
        AuthorID   int      `json:"authorID"`
        Tags       []Tag    `json:"tags"`
    }

    var (
        checklists    = map[int]*Checklist{}
        checklistSeq  = 1
        checklistLock = sync.Mutex{}
    )

创建新的检查表并将其附加到checklists变量之后，如何发送在新检查表的Lines字段中附加新行的请求？
我想出的解决办法是这样的：

func createChecklist(c echo.Context) error {
        checklistLock.Lock()
        defer checklistLock.Unlock()
        newChecklist := &Checklist{
            ID:    checklistSeq,
            Lines: make([]string, 0),
            Tags:  make([]Tag, 0),
        }
        if err := c.Bind(newChecklist); err != nil {
            return err
        }
        checklists[newChecklist.ID] = newChecklist
        checklistSeq++
        return c.JSON(http.StatusOK, newChecklist)
    }
    func addLine(c echo.Context) error {
        checklistLock.Lock()
        defer checklistLock.Unlock()
        id, _ := strconv.Atoi(c.Param("id"))
        checklist := *checklists[id]
        line := []string{""}
        if err := c.Bind(line); err != nil {
            return err
        }
        checklist.Lines = line
        return c.JSON(http.StatusCreated, checklists)
    }

但是，当我测试这个处理程序时，它给出了以下结果：

// 1: Creating a new checklist

    $ curl -X POST -H 'Content-Type: application/json' -d '{"title": "test"}' localhost:1234/checklist

    >> {"id":1,"title":"test","lines":[],"authorName":"","authorID":0,"tags":[]}

    // 2: Check to see the checklist has been created.
 
    $ curl -X GET localhost:1234/checklist

    >> {"1":{"id":1,"title":"test","lines":[],"authorName":"","authorID":0,"tags":[]}}
    // 3: Attempting to create a new line
    $ curl -X POST -H 'Content-Type: application/json' -d '{"lines": "test123"}' localhost:1234/checklist/1

    >> curl: (52) Empty reply from server

    // 4: Confirming it hasn't been created.

    $ curl -X GET localhost:1234/checklist

    >> {"1":{"id":1,"title":"test","lines":[],"authorName":"","authorID":0,"tags":[]}}

因此，该函数实际上并不起作用，因为将POST ping到适当的路由时，既没有返回预期的响应，也没有将行实际添加到字段中。