为什么没有读取标头值？

Question

package middleware

import (

"fmt"

"github.com/labstack/echo/v4"

)

type _getData struct {

Token string `header:"Authorization"`

}

func TokenCheck(next echo.HandlerFunc) echo.HandlerFunc {

return func(c echo.Context) error {

    a := new(_getData)

    c.Bind(a)

    fmt.Print(a)

    return next(c)

}

}

标头中有一个自治值，使用绑定到回声框架，我想知道授权值，但没有返回值。

Answer 1

BindHeaders未被调用 。源代码：Bindfunc (b *DefaultBinder) Bind(i interface{}, c Context) (err error) {    if err := b.BindPathParams(c, i); err != nil {        return err    }    // Issue #1670 - Query params are binded only for GET/DELETE and NOT for usual request with body (POST/PUT/PATCH)    // Reasoning here is that parameters in query and bind destination struct could have UNEXPECTED matches and results due that.    // i.e. is `&id=1&lang=en` from URL same as `{"id":100,"lang":"de"}` request body and which one should have priority when binding.    // This HTTP method check restores pre v4.1.11 behavior and avoids different problems when query is mixed with body    if c.Request().Method == http.MethodGet || c.Request().Method == http.MethodDelete {        if err = b.BindQueryParams(c, i); err != nil {            return err        }    }    return b.BindBody(c, i)}您可以通过以下方式获取标头中的值：func TokenCheck(next echo.HandlerFunc) echo.HandlerFunc {    b := &echo.DefaultBinder{}    return func(c echo.Context) error {        a := new(_getData)        b.BindHeaders(c, a)        fmt.Print(a)        return next(c)    }}艺术token := c.Request().Header.Get("Authorization")