How to Embed a `net/http.Request` in a Go Struct?

Embedding a net/http.Request in a Go Struct

In Go, you can embed one struct type within another. This allows you to reuse fields from the embedded struct without having to define them again in the outer struct.

Consider the following example:

type MyRequest struct {
    http.Request
    PathParams map[string]string
}

Here, the MyRequest struct embeds the http.Request struct. This means that any field of http.Request can be accessed as a field of MyRequest. In addition, MyRequest has its own PathParams field.

To initialize the anonymous inner struct http.Request in the New function, you need to set the appropriate fields. You can do this in two ways:

Using a Composite Literal

req := new(MyRequest)
req.PathParams = pathParams
req.Request = origRequest

The composite literal syntax allows you to create a new instance of a struct and initialize its fields in one line. In this case, we are creating a new MyRequest instance and setting its PathParams field to the value of the pathParams argument. We are also setting the Request field to the value of the origRequest argument.

Using a Pointer Receiver

req := &MyRequest{
  PathParams: pathParams
  Request: origRequest
}

The pointer receiver syntax allows you to access the fields of a struct pointer directly. In this case, we are creating a new pointer to a MyRequest instance and setting its PathParams and Request fields directly.

Both of these approaches will initialize the inner struct http.Request in the MyRequest struct with the value of the origRequest argument.

For more information about embedding and how the fields get named, please refer to the Go specification at http://golang.org/ref/spec#Struct_types.

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