我是Elixir和Erlang的新手,在访问https网址时遇到了一些问题.我尝试过特定于Elixir的HTTPotion和Erlang的:inets模块.
所以从iex控制台(Interactive Elixir):
使用HTTPotion:
HTTPotion.start HTTPotion.get("https://api.github.com")
用:inets:
:inets.start :ssl.start :httpc.request('https://api.github.com')
在这两种情况下,我得到一个巨大的堆栈跟踪,必不可少的是说某处有一个糟糕的匹配并且状态机正在终止.访问http URL时我不明白这一点.我错过了什么?谢谢.
编辑 - 这是来自HTTPotion的错误消息:
iex(40)> HTTPotion.get("https://api.github.com") ** (Protocol.UndefinedError) protocol String.Chars not implemented for {:EXIT, {{{{:badmatch, ""}, [{:ssl_handshake, :dec_hello_extensions, 2, [file: 'ssl_handshake.erl', line: 1737]}, {:ssl_handshake, :decode_handshake, 3, [file: 'ssl_handshake.erl', line: 926]}, {:tls_handshake, :get_tls_handshake_aux, 3, [file: 'tls_handshake.erl', line: 155]}, {:tls_connection, :next_state, 4, [file: 'tls_connection.erl', line: 433]}, {:gen_fsm, :handle_msg, 7, [file: 'gen_fsm.erl', line: 503]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 237]}]}, {:gen_fsm, :sync_send_all_state_event, [#PID<0.227.0>, {:start, 5000}, :infinity]}}, {:gen_server, :call, [#PID<0.226.0>, {:send_req, {{:url, 'https://api.github.com', 'api.github.com', 443, :undefined, :undefined, '/', :https, :hostname}, [], :get, "", [], 5000}}, 5000]}}} (elixir) lib/string/chars.ex:3: String.Chars.impl_for!/1 (elixir) lib/string/chars.ex:17: String.Chars.to_string/1 (httpotion) lib/httpotion.ex:157: HTTPotion.request/5 iex(40)> 16:50:10.640 [error] ** State machine #PID<0.227.0> terminating ** Last message in was {:tcp, #Port<0.7454>, <<22, 3, 3, 0, 93, 2, 0, 0, 89, 3, 3, 84, 40, 158, 178, 2, 216, 45, 226, 183, 79, 42, 199, 205, 19, 31, 63, 223, 138, 208, 132, 186, 28, 129, 123, 235, 1, 142, 90, 243, 25, 70, 210, 32, 199, 56, 251, 131, ...>>} ** When State == :hello ** Data == [data: [{'StateData', {:state, :client, {#Reference<0.0.0.1360>, #PID<0.226.0>}, :gen_tcp, :tls_connection, :tcp, :tcp_closed, :tcp_error, 'api.github.com', 443, #Port<0.7454>, {:ssl_options, :tls, [{3, 3}, {3, 2}, {3, 1}, {3, 0}], :verify_none, {#Function<7.50551058/3 in :ssl.handle_verify_options/2>, []}, #Function<8.50551058/1 in :ssl.handle_verify_options/2>, false, false, :undefined, 1, "", '***', "", '***', '***', '***', "", '***', :undefined, :undefined, '***', '***', [<<192, 36>>, <<192, 40>>, <<192, 38>>, <<192, 42>>, <<0, 107>>, <<0, 106>>, <<0, 61>>, <<192, 35>>, <<192, 39>>, <<192, 37>>, <<192, 41>>, <<0, 103>>, <<0, ...>>, <<...>>, ...], #Function<1.50551058/4 in :ssl.handle_options/1>, true, 268435456, false, :undefined, false, :undefined, :undefined, true, :undefined, false}, {:socket_options, :binary, 0, 0, 0, false}, '***', '***', '***', 49168, '***', 61463, :ssl_session_cache, {3, 3}, false, :undefined, {:undefined, :undefined}, :undefined, :undefined, '***', '***', '***', :undefined, '***', '***', '***', 53269, #Reference<0.0.0.1363>, :undefined, '***', {false, :first}, {#PID<0.226.0>, #Reference<0.0.0.1361>}, #Reference<0.0.0.1364>, {[], []}, false, true, false, false, :undefined, :undefined, :undefined}}]] ** Reason for termination = ** {{:badmatch, ""}, [{:ssl_handshake, :dec_hello_extensions, 2, [file: 'ssl_handshake.erl', line: 1737]}, {:ssl_handshake, :decode_handshake, 3, [file: 'ssl_handshake.erl', line: 926]}, {:tls_handshake, :get_tls_handshake_aux, 3, [file: 'tls_handshake.erl', line: 155]}, {:tls_connection, :next_state, 4, [file: 'tls_connection.erl', line: 433]}, {:gen_fsm, :handle_msg, 7, [file: 'gen_fsm.erl', line: 503]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 237]}]} 16:50:10.642 [error] GenServer #PID<0.226.0> terminating Last message: {:send_req, {{:url, 'https://api.github.com', 'api.github.com', 443, :undefined, :undefined, '/', :https, :hostname}, [], :get, "", [], 5000}} State: {:state, 'api.github.com', 443, :undefined, #Reference<0.0.0.1352>, false, :undefined, [], true, :undefined, false, [], {[], []}, :undefined, :idle, :undefined, "", 0, 0, [], :undefined, :undefined, :undefined, :undefined, false, :undefined, :undefined, "", :undefined, false, 188446, 0, :undefined} ** (exit) exited in: :gen_fsm.sync_send_all_state_event(#PID<0.227.0>, {:start, 5000}, :infinity) ** (EXIT) an exception was raised: ** (MatchError) no match of right hand side value: "" (ssl) ssl_handshake.erl:1737: :ssl_handshake.dec_hello_extensions/2 (ssl) ssl_handshake.erl:926: :ssl_handshake.decode_handshake/3 (ssl) tls_handshake.erl:155: :tls_handshake.get_tls_handshake_aux/3 (ssl) tls_connection.erl:433: :tls_connection.next_state/4 (stdlib) gen_fsm.erl:503: :gen_fsm.handle_msg/7 (stdlib) proc_lib.erl:237: :proc_lib.init_p_do_apply/3 nil iex(41)>
David Escoba.. 9
谜团已揭开.我把这个问题发给了Elixir-lang组,这是Erlang OTP 17.3中的一个已知错误.解决方案是应用补丁,等待下一个版本或降级到OTP 17.1.
详情请访问:https: //groups.google.com/forum/#!topic/elixir-lang-talk/xsAEzCfmRoQ
谜团已揭开.我把这个问题发给了Elixir-lang组,这是Erlang OTP 17.3中的一个已知错误.解决方案是应用补丁,等待下一个版本或降级到OTP 17.1.
详情请访问:https: //groups.google.com/forum/#!topic/elixir-lang-talk/xsAEzCfmRoQ