调整FormFile和FormType的优先级

[guonaihong]

如果File不为空，且FormFile包裹的是一个正确的文件名，File的名字就是multipart/form-data filename里面的名字。
代码举例

package main

import (
	"fmt"

	"github.com/guonaihong/gout"
)

func main() {
	err := gout.POST(":1234").Debug(true).SetForm(gout.H{"voice": gout.FormType{FileName: "new-file-name", File: gout.FormFile("./voice.pcm")}}).Do()
	fmt.Printf("err:%s\n", err)
}

• 现在的http 抓包

> POST / HTTP/1.1
> Content-Type: multipart/form-data; boundary=c13f1e919fc51a4110b8d387faccb9da8828ed72dcd6f939ed9893b1cf44
>

--c13f1e919fc51a4110b8d387faccb9da8828ed72dcd6f939ed9893b1cf44
Content-Disposition: form-data; name="voice"; filename="./voice.pcm"
Content-Type: application/octet-stream

wowowowow
wowowowow
wowowowow

--c13f1e919fc51a4110b8d387faccb9da8828ed72dcd6f939ed9893b1cf44--


< HTTP/1.1 200 OK
< Server: gurl-server
< Date: Wed, 22 Jul 2020 10:46:42 GMT
< Content-Length: 0

• 修改后的接口

> POST / HTTP/1.1
> Content-Type: multipart/form-data; boundary=c13f1e919fc51a4110b8d387faccb9da8828ed72dcd6f939ed9893b1cf44
>

--c13f1e919fc51a4110b8d387faccb9da8828ed72dcd6f939ed9893b1cf44
Content-Disposition: form-data; name="voice"; filename="new-file-name"
Content-Type: application/octet-stream

wowowowow
wowowowow
wowowowow
wowowowow
wowowowow
wowowowow

--c13f1e919fc51a4110b8d387faccb9da8828ed72dcd6f939ed9893b1cf44--


< HTTP/1.1 200 OK
< Server: gurl-server
< Date: Wed, 22 Jul 2020 10:46:42 GMT
< Content-Length: 0