Here is how I would expect to be able to send a PUT request with wreq:
{-# LANGUAGE OverloadedStrings #-}
import Network.Wreq
main = put "http://httpbin.org/put" ["foo":=(1::Int)]
However, this gives the following error:
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")
As is evident from the error message,
wreq appears to be sending a POST request instead,
despite the fact that I used the put method.
How can I get wreq to actually send a PUT request?
I believe the issue is that if you try to
putusing a[FormParam], the method gets overridden and changed toPOST. If youputa different kind of payload:then it works fine:
I believe this is a limitation/intentional design decision in the underlying
http-clientpackage thatwrequses. When the functionurlEncodedBodyis used to pack form data into the body, it has the side effect of changing the method of the request toPOST.