How to Read a Request Body Multiple Times in Go-Gin?

How to Read Request Body Multiple Times in Go-Gin

When validating request data, it's often necessary to retain the original request body for further processing. However, reading the body multiple times can cause issues.

Issue:

The following code reads the request body to perform validation but fails to retain it for subsequent function calls:

func SignupValidator(c *gin.Context) {
    var bodyBytes []byte
    if c.Request.Body != nil {
        bodyBytes, _ = ioutil.ReadAll(c.Request.Body)
    }
    fmt.Println(string(bodyBytes)) // empty
    c.Next()
}

Solution:

To access the request body multiple times, use the following steps:

1. Read the request body once and store it in a variable.
2. Create a new buffer with the same body bytes.
3. Set the request body to the newly created buffer.

func SignupValidator(c *gin.Context) {
    byteBody, _ := ioutil.ReadAll(c.Request.Body)
    c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(byteBody))

    fmt.Println(string(byteBody)) // contains the request body

    c.Next()
}

Now, subsequent function calls can access the body data without any issues.

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