Helps writing file parts to MIME multipart messages according to RFC7578 while preserving the original content type inferred from the file extension. See the documentation for more information.
CreateFormFile from multipart writer sets the content type always to application/octet-stream. If you need to preserve the content type of the file decided by its file extension, choose a function among CreateFilePart, WriteFile or WriteFileReader from this package.
Add this package to go.mod and go.sub in your Go project:
go get github.com/prantlf/go-multipart-helpers
Upload a file with comment:
import (
"net/http"
helpers "github.com/prantlf/go-multipart-helpers"
)
// compose a multipart form-data content
message := &bytes.Buffer{}
writer := multipart.NewWriter(message)
comp.AddField("comment", "a comment")
err := helpers.WriteFile(writer, "file", "test.txt")
// post a request with the generated content type and body
resp, err := http.DefaultClient.Post("http://host.com/upload",
writer.FormDataContentType(), message)See the documentation for the full interface.