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

Go-Gin: Reading Request Body Multiple Times

In Go-Gin, reading the request body can be tricky if you need to access it multiple times. The issue arises when middleware modifies the request body, making subsequent access difficult.

Consider the following scenario: you have a validation middleware that reads the body for validation, followed by another handler that requires the unmodified body. In this case, the middleware's modifications interfere with the subsequent handler's access to the original body.

To resolve this issue, you can use the following approach:

1. Read the request body into a variable before passing it to the middleware:

bodyBytes, _ := ioutil.ReadAll(c.Request.Body)

2. Pass the body variable to the middleware and perform validation on it:

if err := c.ShouldBindJSON(&user); err != nil {
    // Validation logic
}

3. After validation, restore the original body using io.NopCloser:

c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(ByteBody))

4. Now, the bodyBytes variable contains the original unmodified body, and you can use it in subsequent handlers without any issues.

To implement this solution in the provided code, replace the following lines in the middleware:

// var bodyBytes []byte
// if c.Request.Body != nil {
//  bodyBytes, _ = ioutil.ReadAll(c.Request.Body)
// }

with:

bodyBytes, _ := ioutil.ReadAll(c.Request.Body)
c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(bodyBytes))

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