Missing hash key: HTTP::Headers::Key(@name="Host") calling client.exec with HTTP::Request

[vonKingsley]

I use the convenience of HTTP::Client.new and client.exec with a HTTP::Request to put the host:port in the http header. I can easily work around the issue by manually adding the header, but others may come across the issue and be surprised.

WebMock.stub(:post, "www.noroute.com")

url = "www.noroute.com"
headers = HTTP::Headers{"Content-Type" => "application/xml"}
service_call = HTTP::Request.new("POST", "/webservice", headers, "", "HTTP/1.0")
client = HTTP::Client.new(url, ssl: true)
web_response = client.exec service_call

Mocking with above code throws the below error

Missing hash key: HTTP::Headers::Key(@name="Host") (KeyError)
[4515630242] *CallStack::unwind:Array(Pointer(Void)) +82
[4515630145] *CallStack#initialize<CallStack>:Array(Pointer(Void)) +17
[4515630104] *CallStack::new:CallStack +40
[4515725905] *KeyError@Exception#initialize<KeyError, String, Nil>:CallStack +33
[4515725836] *KeyError::new<String>:KeyError +92
[4515839028] *Hash(HTTP::Headers::Key, Array(String))@Hash(K, V)#fetch<Hash(HTTP::Headers::Key, Array(String)), HTTP::Headers::Key>:Array(String) +148
[4515836420] *HTTP::Headers#fetch<HTTP::Headers, HTTP::Headers::Key>:String +84
[4515836317] *HTTP::Headers#[]<HTTP::Headers, String>:String +61
[4515812979] *WebMock::Stub#matches_host?<WebMock::Stub, HTTP::Request>:Bool +67
[4515812716] *WebMock::Stub#matches?<WebMock::Stub, HTTP::Request>:Bool +140
[4515811239] *WebMock::StubRegistry#find_stub<WebMock::StubRegistry, HTTP::Request>:WebMock::Stub? +103
[4515812143] *WebMock@WebMock::find_stub<HTTP::Request>:WebMock::Stub? +31
[4515844700] *HTTP::Client#exec_internal<HTTP::Client, HTTP::Request>:HTTP::Client::Response +28
[4515844642] *HTTP::Client#exec<HTTP::Client, HTTP::Request>:HTTP::Client::Response +34