Question

这就是我希望能够使用wreq发送PUT请求的方式：

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

但是，这会出现以下错误：

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")

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

如何获得wreq来实际发送PUT请求？

Answer 1

我认为问题在于，如果您尝试使用put [FormParam]，则该方法将被覆盖并更改为POST。如果您put使用另一种有效负载：

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

然后正常工作：

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

我认为这是http-client使用的基础wreq包中的限制/故意设计决定。当函数urlEncodedBody用于将表单数据打包到正文中时，它具有将请求方法更改为POST的副作用。

如何使用wreq发送PUT请求？

1 个答案: