Try to bind body into different structs
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The normal methods for binding request body consumes c.Request.Body
and they
cannot be called multiple times.
type formA struct { Foo string `json:"foo" xml:"foo" binding:"required"`}
type formB struct { Bar string `json:"bar" xml:"bar" binding:"required"`}
func SomeHandler(c *gin.Context) { objA := formA{} objB := formB{} // This c.ShouldBind consumes c.Request.Body and it cannot be reused. if errA := c.ShouldBind(&objA); errA == nil { c.String(http.StatusOK, `the body should be formA`) // Always an error is occurred by this because c.Request.Body is EOF now. } else if errB := c.ShouldBind(&objB); errB == nil { c.String(http.StatusOK, `the body should be formB`) } else { ... }}
For this, you can use c.ShouldBindBodyWith
.
func SomeHandler(c *gin.Context) { objA := formA{} objB := formB{} // This reads c.Request.Body and stores the result into the context. if errA := c.ShouldBindBodyWith(&objA, binding.JSON); errA == nil { c.String(http.StatusOK, `the body should be formA`) // At this time, it reuses body stored in the context. } else if errB := c.ShouldBindBodyWith(&objB, binding.JSON); errB == nil { c.String(http.StatusOK, `the body should be formB JSON`) // And it can accepts other formats } else if errB2 := c.ShouldBindBodyWith(&objB, binding.XML); errB2 == nil { c.String(http.StatusOK, `the body should be formB XML`) } else { ... }}
c.ShouldBindBodyWith
stores body into the context before binding. This has a slight impact to performance, so you should not use this method if you are enough to call binding at once.- This feature is only needed for some formats —
JSON
,XML
,MsgPack
,ProtoBuf
. For other formats,Query
,Form
,FormPost
,FormMultipart
, can be called byc.ShouldBind()
multiple times without any damage to performance (See #1341).