search

Home >Backend Development >Golang >How to Send Multipart Forms with Files Using Go\'s `mime/multipart` and `net/http` Packages?

How to Send Multipart Forms with Files Using Go\'s `mime/multipart` and `net/http` Packages?

Barbara Streisand
Barbara StreisandOriginal
2024-11-22 08:10:09189browse

How to Send Multipart Forms with Files Using Go's `mime/multipart` and `net/http` Packages?

HTTP-POST file multipart

This guide provides a solution to sending multipart forms using Go packages mime/multipart and http.

Consider the following HTML markup:

<html>
<head><title>Multipart Test</title></head>
<body>
<form action="/multipart" enctype="multipart/form-data" method="POST">

<label for="file"> Please select a File </label>
<input>

For the Go implementation:

import (
    "bytes"
    "io"
    "mime/multipart"
    "net/http"
    "os"
)

// Upload file to google code
func Upload(tarball string) (err os.Error) {
    // Create buffer
    buf := new(bytes.Buffer) // caveat IMO dont use this for large files, \
    // create a tmpfile and assemble your multipart from there (not tested)
    w := multipart.NewWriter(buf)
    // Create a form field writer for field label
    label, err := w.CreateFormField("label")
    if err != nil {
        return err
    }
    // Write label field
    label.Write([]byte("label here"))
    // Create a form field writer for field summary
    summary, err := w.CreateFormField("summary")
    if err != nil {
        return err
    }
    // Write summary field
    summary.Write([]byte("summary here"))
    // Create file field
    fw, err := w.CreateFormFile("upload", tarball)
    if err != nil {
        return err
    }
    fd, err := os.Open(tarball)
    if err != nil {
        return err
    }
    defer fd.Close()
    // Write file field from file to upload
    _, err = io.Copy(fw, fd)
    if err != nil {
        return err
    }
    // Important if you do not close the multipart writer you will not have a
    // terminating boundry
    w.Close()
    req, err := http.NewRequest("POST", repoUrl, buf)
    if err != nil {
        return err
    }
    req.Header.Set("Content-Type", w.FormDataContentType())
    req.SetBasicAuth("[email protected]", "password")
    res, err := client.Do(req)
    if err != nil {
        return err
    }
    io.Copy(os.Stderr, res.Body) // Replace this with Status.Code check
    return err
}

The above is the detailed content of How to Send Multipart Forms with Files Using Go\'s `mime/multipart` and `net/http` Packages?. For more information, please follow other related articles on the PHP Chinese website!

html for using this http
Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：Why is Indexing on Slice Pointers Not Allowed in Go?Next article：Why is Indexing on Slice Pointers Not Allowed in Go?

Related articles

See more