What is wrong with my GET request? - http

Question

Sorry to bother with something that should be easy.
I have this HTTP GET request:
GET /ip HTTP/1.1
Host: httpbin.org
Connection: close
Accept: */*
User-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.1)
When I send this request via my ESP8266 it returns a 404 error:
HTTP/1.1 404 Not Found
Date: Fri, 04 Sep 2015 16:34:46 GMT
Server: Apache
Content-Length: 1363
X-Frame-Options: deny
Connection: close
Content-Type: text/html
But when I (and you) go to http://httpbin.org/ip it works perfectly!
What is wrong?
DETAILS
I construct my request in Lua:
conn:on("connection", function(conn, payload)
print('\nConnected')
req = "GET /ip"
.." HTTP/1.1\r\n"
.."Host: httpbin.org\r\n"
.."Connection: close\r\n"
.."Accept: */*\r\n"
.."User-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.1)\r\n"
.."\r\n"
print(req)
conn:send(req)
end)
And if I use another host (given is this example) it works:
conn:on("connection", function(conn, payload)
print('\nConnected')
conn:send("GET /esp8266/test.php?"
.."T="..(tmr.now()-Tstart)
.."&heap="..node.heap()
.." HTTP/1.1\r\n"
.."Host: benlo.com\r\n"
.."Connection: close\r\n"
.."Accept: */*\r\n"
.."User-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.1)\r\n"
.."\r\n")
end)

Answer 1

Are you actually connecting to httpbin.org ? Or somewhere else?
I just tried issuing your request by typing it into telnet, and it worked for me. But the server responding was nginx, whereas your example shows apache.
$ telnet httpbin.org 80
Trying 54.175.219.8...
Connected to httpbin.org.
Escape character is '^]'.
GET /ip HTTP/1.1
Host: httpbin.org
Connection: close
Accept: */*
User-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.1)
HTTP/1.1 200 OK
Server: nginx
Date: Wed, 07 Oct 2015 06:08:40 GMT
Content-Type: application/json
Content-Length: 32
Connection: close
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
{
"origin": "124.149.55.34"
}
Connection closed by foreign host.
When I try another request with some other URI to force a 404 response, I see this:
HTTP/1.1 404 NOT FOUND
Server: nginx
Date: Wed, 07 Oct 2015 06:12:21 GMT
Content-Type: text/html
Content-Length: 233
Connection: close
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
Which again is nothing like the response you said you got from httpbin.org.

Answer 2

http.get("http://httpbin.org/ip", nil, function(code, data)
if (code < 0) then
print("HTTP request failed")
else
print(code, data)
end
end)
http.post('http://httpbin.org/post',
'Content-Type: application/json\r\n',
'{"hello":"world"}',
function(code, data)
if (code < 0) then
print("HTTP request failed")
else
print(code, data)
end
end)
see the reference here.

Answer 3

It's your request line the server doesn't like.
This will do the job:
GET http://httpbin.org/ip HTTP/1.1
Host: httpbin.org