發(fā)布到具有 Content-Type 的 API：multipart/form-data

嘗試 POST 到需要 Content-Type 的 API 時(shí)： multipart/form-data，如果您使用 []byte 參數(shù)和字符串參數(shù)，您可能會(huì)遇到問(wèn)題。提供的錯(cuò)誤消息表明重定向問(wèn)題，與當(dāng)前問(wèn)題無(wú)關(guān)。

解決方案在于使用 multipart 包構(gòu)建 multipart/form-data 請(qǐng)求正文。下面是一個(gè)示例：

<code class="go">package main

import (
    "bytes"
    "fmt"
    "io"
    "io/ioutil"
    "mime/multipart"
    "net/http"

    "github.com/ganshane/typeregistry"
)

type FileItem struct {
    Key      string //image_content
    FileName string //test.jpg
    Content  []byte //[]byte
}

func NewPostFile(url string, paramTexts map[string]interface{}, paramFile FileItem) ([]byte, error) {
    // Construct the multipart request body

    bodyBuf := &bytes.Buffer{}
    bodyWriter := multipart.NewWriter(bodyBuf)

    for k, v := range paramTexts {
        bodyWriter.WriteField(k, v.(string))
    }
    fileWriter, err := bodyWriter.CreateFormFile(paramFile.Key, paramFile.FileName)
    if err != nil {
        fmt.Println(err)
        //fmt.Println("Create form file error: ", error)
        return nil, err
    }
    fileWriter.Write(paramFile.Content)
    contentType := bodyWriter.FormDataContentType()
    bodyWriter.Close()
    fmt.Println(bodyBuf.String())

    // Perform the POST request

    resp, err := http.Post(url, contentType, bodyBuf)
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()
    fmt.Println(resp)

    // Handle the response

    if resp.StatusCode < 200 || resp.StatusCode >= 300 {
        b, _ := ioutil.ReadAll(resp.Body)
        return nil, fmt.Errorf("[%d %s]%s", resp.StatusCode, resp.Status, string(b))
    }
    respData, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }
    fmt.Println(string(respData))
    return respData, nil
}

func main() {
    m := make(map[string]interface{}, 0)
    m["fileName"] = "good"
    m["name"] = typeregistry.Base64ToByte("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")

    paramFile := FileItem{
        Key:      "image_content",
        FileName: "test.jpg",
        Content:  m["name"].([]byte),
    }

    respData, err := NewPostFile("API_URL", m, paramFile)
    if err != nil {
        // Handle error
    }

    fmt.Println(string(respData))
}
</code>

在這個(gè)示例中，我們使用 NewPostFile 函數(shù)構(gòu)建一個(gè)包含 multipart/form-data 的 POST 請(qǐng)求，包括常規(guī)表單字段和文件。該函數(shù)將 URL、字符串參數(shù)映射和文件項(xiàng)作為輸入。

可以從 respData 變量檢索來(lái)自 API 的響應(yīng)并根據(jù)需要進(jìn)行處理。錯(cuò)誤處理和響應(yīng)處理代碼留給開(kāi)發(fā)人員根據(jù)他們的具體要求來(lái)實(shí)現(xiàn)。

此解決方案應(yīng)該解決您在使用 Content-Type: multipart/form-data POST 到 API 時(shí)遇到的問(wèn)題帶有 [] 字節(jié)參數(shù)和字符串參數(shù)。

以上是如何使用 []byte 參數(shù)和字符串參數(shù)發(fā)布到內(nèi)容類型為 multipart/form-data 的 API？的詳細(xì)內(nèi)容。更多信息請(qǐng)關(guān)注PHP中文網(wǎng)其他相關(guān)文章！