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

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

Barbara Streisand

Release： 2024-11-22 08:10:09

Original

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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>

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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
}

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