如何通过F#代码进行外部POST API调用

时间:2019-07-06 00:24:18

标签: web f# f#-data f#-fake

我想从F#调用外部POST API,该API具有如下所示的多部分表单请求主体,因此如何在F#中进行操作?

External POST API
url : “https://”
Content-Type : Multipart/Form-data
Body :- key(file) -> value(file which is browsed)
key(secured) -> value(String)

感谢您阅读此问题。

我尝试了以下代码,但对我不起作用

Http.Request
  ( "http://endpoint/for/multipart/data", 
  body = Multipart(
    boundary = "define a custom boundary here", // this is used to separate the items you're streaming
    parts = [
      MultipartItem("formFieldName", "file",IFormFile.OpenReadStream())
    ]


))

1 个答案:

答案 0 :(得分:0)

我将为此使用HTTp客户端,在fsharp中,您可以使用F# Data: HTTP Utilities之类的各种东西,或者我建议使用HTTP.fs的HTTP客户端软件包:

只需创建一个控制台应用程序并添加此nuget包

 dotnet new console -lang f# -o http-rest-client
 cd http-rest-client
 dotnet add package Http.fs
 dotnet add package Hopac

然后用以下代码替换Program.fs中的代码:

//通过http://fsharp.org

了解有关F#的更多信息
open System.IO
open System.Text
open Hopac
open HttpFs.Client

let multipartRequest =
    Request.createUrl Post "http://httpbin.org/post"
    |> Request.setHeader (Accept "application/json")
    |> Request.body (BodyForm [
        FormFile ("file", ("testfile.txt",
                           ContentType.create("text", "plain"),
                           Binary (File.ReadAllBytes ("./testfile.txt"))
                           ))])
    |> Request.responseAsString
    |> run



[<EntryPoint>]
let main argv =
    printfn "%s" multipartRequest
    0 

创建一个文件,在这种情况下,可以更好地查看具有可读内容的.txt文件。和httpbin p用于测试目的,在我的情况下,该文件包含:

➜ cat testfile.txt
calimero calimero calimero calimero

然后您可以运行您的项目:

dotnet run

{
  "args": {},
  "data": "",
  "files": {
    "file": "calimero calimero calimero calimero\n"
  },
  "form": {},
  "headers": {
    "Accept": "application/json",
    "Content-Length": "241",
    "Content-Type": "multipart/form-data; boundary=\"BPj'o/kJ+CaKDQUuOnIaoLq/diChFH\"",
    "Host": "httpbin.org"
  },
  "json": null,
  "origin": "83.53.248.254, 83.53.248.254",
  "url": "https://httpbin.org/post"
}

Http.fs包中有很多发送表单的示例,并且库设法添加了multipart-form-data所需的herader。