make a http request with a custom body as multipart form data in go

To make a HTTP request with a custom body as multipart form data in Go, you can follow the below steps:

First create a bytes.Buffer object to write your multipart body to.
Then create a multipart.Writer object, passing the bytes.Buffer object as an argument.
Use the CreateFormFile method of the multipart.Writer object to create a new form file with its field name, MIME type and file name as arguments. This will return a io.Writer object which will accept the content of the file.
Write the file content to the io.Writer object.
Close the io.Writer object and check for any errors.
Repeat steps 3 to 5 for each form file you want to send as part of the request.
Create a new HTTP request using the http.NewRequest function. Set the HTTP method, URL and any headers you need for your request.
Set the content type of the request to the value of the ContentType field of the multipart.Writer object.
Set the HTTP request body to the bytes.Buffer object by calling its Bytes method.
Use the http.DefaultClient.Do function to execute the request.

Here's an example code snippet:


main.go
import (
    "bytes"
    "mime/multipart"
    "net/http"
)

func makeMultipartRequest() (*http.Response, error) {
    // Example file content
    fileContent := []byte("file contents")

    // Create buffer to write multipart body to
    var buffer bytes.Buffer

    // Create multipart writer
    writer := multipart.NewWriter(&buffer)

    // Create form file
    fileWriter, err := writer.CreateFormFile("file", "example.txt")
    if err != nil {
        return nil, err
    }

    // Write file content to form file
    _, err = fileWriter.Write(fileContent)
    if err != nil {
        return nil, err
    }

    // Close multipart writer
    writer.Close()

    // Create HTTP request
    req, err := http.NewRequest(http.MethodPost, "http://example.com/upload", &buffer)
    if err != nil {
        return nil, err
    }

    // Set content type
    req.Header.Set("Content-Type", writer.FormDataContentType())

    // Execute request
    client := http.DefaultClient
    resp, err := client.Do(req)
    if err != nil {
        return nil, err
    }

    return resp, nil
}
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