How to Use multipart in Go
multipart in Golang is a powerful tool for creating multipart HTTP requests. This can be particularly useful when sending data that includes both text and file content.
Solution
To create a multipart form request, follow these steps:
- Instantiate a bytes.Buffer and a multipart.Writer object.
- Use the multipart.Writer to create multipart.Part objects, one for each part of the request.
- Set the Content-Type header of the request to the value returned by writer.FormDataContentType().
- Write the contents of the request parts to the multipart.Writer.
- Call writer.Close() to complete the request.
Example
In your example, you would create a multipart mixed request as follows:
<code class="go">body := &bytes.Buffer{} writer := multipart.NewWriter(body) part, err := writer.CreatePart(textproto.MIMEHeader{"Content-Type": {"application/json"}}) if err != nil { // handle error } part.Write(jsonStr) writer.Close() req, err := http.NewRequest("POST", "blabla", body) if err != nil { // handle error } req.Header.Set("Content-Type", "multipart/mixed; boundary="+writer.Boundary())</code>
Bonus Tip: Using cURL
You can also generate a multipart request using cURL with the following command:
curl -F "field=value" -H "Content-Type: multipart/mixed; boundary=boundary" http://1.1.1.1/blabla
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