add an example to test multiple connections over a proxy.

examples/test_multiple_proxy.erl

@@ -0,0 +1,52 @@
+#!/usr/bin/env escript
+%% -*- erlang -*-
+%%! -pa ./ebin -pa ./deps/mimetypes/ebin
+%%
+%%
+%%
+%%
+-define(MAX, 100).
+-define(PROXY_OPTS, {"127.0.0.1", 8888}).
+
+wait_request() ->
+    receive
+        start -> ok
+    end.
+
+request(WaitPid) ->
+    wait_request(),
+    Method = get,
+    Url = <<"https://friendpaste.com">>,
+    Headers = [{<<"Connection">>, <<"keep-alive">>}],
+    Options = [{pool, default}, {proxy, ?PROXY_OPTS}],
+    {ok, _, _Headers, Ref} = hackney:request(Method, Url, Headers, <<>>, Options),
+    {ok, _} = hackney:body(Ref),
+    WaitPid ! ack.
+
+wait(100) ->
+    io:format("~n", []),
+    ok;
+wait(N) ->
+    receive
+        ack ->
+            io:format(".", []),
+            wait(N+1)
+    after 15000 ->
+            PoolSize = hackney_pool:count(default),
+            io:format("~ntimeout ~p/~p done. ~p in the pool.~n",
+                      [N, ?MAX, PoolSize])
+    end.
+
+
+main(_) ->
+    hackney:start(),
+    hackney_pool:start_pool(default, []),
+    io:format("processing ", []),
+    Self = self(),
+    Pids = lists:foldr(fun(_, Acc) ->
+                    Pid = spawn(fun() -> timer:sleep(100), request(Self) end),
+                    [Pid | Acc]
+            end, [], lists:seq(1, ?MAX)),
+
+    [Pid ! start || Pid <- Pids],
+    wait(0).