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以下是我希望能够发送 PUT 请求的方式wreq：

{-# LANGUAGE OverloadedStrings #-}
import Network.Wreq
main = put "http://httpbin.org/put" ["foo":=(1::Int)]

但是，这会产生以下错误：

HttpExceptionRequest Request {
  host                 = "httpbin.org"
  port                 = 80
  secure               = False
  requestHeaders       = [("Content-Type","application/x-www-form-urlencoded"),("User-Agent","haskell wreq-0.5.3.2")]
  path                 = "/put"
  queryString          = ""
  method               = "POST"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 (StatusCodeException (Response {responseStatus = Status {statusCode = 405, statusMessage = "METHOD NOT ALLOWED"}, responseVersion = HTTP/1.1, responseHeaders = [("Date","Fri, 07 Feb 2020 19:26:28 GMT"),("Content-Type","text/html"),("Content-Length","178"),("Connection","keep-alive"),("Server","gunicorn/19.9.0"),("Allow","PUT, OPTIONS"),("Access-Control-Allow-Origin","*"),("Access-Control-Allow-Credentials","true")], responseBody = (), responseCookieJar = CJ {expose = []}, responseClose' = ResponseClose}) "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\">\n<title>405 Method Not Allowed</title>\n<h1>Method Not Allowed</h1>\n<p>The method is not allowed for the requested URL.</p>\n")

从错误消息中可以明显看出 wreq，尽管我使用了该put方法，但似乎正在发送 POST 请求。

我怎样才能wreq真正发送 PUT 请求？

4

1 回答 1

4

我认为问题在于，如果您尝试put使用 a [FormParam]，该方法将被覆盖并更改为POST. 如果您put使用不同类型的有效负载：

main = put "http://httpbin.org/put" ("xyz" :: ByteString)

然后它工作正常：

Response {responseStatus = Status {statusCode = 200, statusMessage = "OK"}, ...

我相信这是使用的底层http-client包中的限制/有意设计决策wreq。当该函数urlEncodedBody用于将表单数据打包到正文中时，它的副作用是将请求的方法更改为POST.

于 2020-02-07T19:54:57.113 回答