The proxy originally is not set and shown as undefined:
httpc:get_options(all).
{ok,[{proxy,{undefined,[]}},
{https_proxy,{undefined,[]}},
{pipeline_timeout,0},
{max_pipeline_length,2},
{max_keep_alive_length,5},
{keep_alive_timeout,120000},
{max_sessions,2},
{cookies,disabled},
{verbose,false},
{ipfamily,inet},
{ip,default},
{port,default},
{socket_opts,[]},
{unix_socket,undefined}]}
I'm able to set the proxy option without problem:
httpc:set_options([{proxy, {{"www-proxy.mycompany.com", 8000},["localhost"]}}]).
How do you unset the proxy back not undefined (or no proxy) when it is not needed? I tried:
httpc:set_options([{proxy,{undefined, []}}]).
But it throws an exception:
** exception throw: {error,{bad_option,proxy,{undefined,[]}}}
in function httpc:bad_option/2 (httpc.erl, line 1102)
in call from httpc:validate_options/2 (httpc.erl, line 932)
in call from httpc:validate_options/1 (httpc.erl, line 922)
in call from httpc:set_options/2 (httpc.erl, line 236)
What am I doing wrong?
What you are doing wrong that is argument format you pass to the function. Right format is
httpc:set_options([{proxy, {{"", 0},[]}}]).
Now proxy host will be "":0. But I do not know is it acceptable for your task.
Response to comment: Try to set 'proxy' option directly to http_manager instead of kill him:
httpc_manager:set_options([{proxy,{undefined, []}}],httpc_manager).
Look at erlang shell:
1> inets:start().
ok
2> httpc:set_options([{proxy, {{"www-proxy.mycompany.com", 8000},["localhost"]}}]).
ok
3> httpc:get_options(all).
{ok,[{proxy,{{"www-proxy.mycompany.com",8000},
["localhost"]}},
{https_proxy,{undefined,[]}},
{pipeline_timeout,0},
{max_pipeline_length,2},
{max_keep_alive_length,5},
{keep_alive_timeout,120000},
{max_sessions,2},
{cookies,disabled},
{verbose,false},
{ipfamily,inet},
{ip,default},
{port,default},
{socket_opts,[]},
{unix_socket,undefined}]}
4> httpc_manager:set_options([{proxy,{undefined, []}}],httpc_manager).
ok
5> httpc:get_options(all).
{ok,[{proxy,{undefined,[]}},
{https_proxy,{undefined,[]}},
{pipeline_timeout,0},
{max_pipeline_length,2},
{max_keep_alive_length,5},
{keep_alive_timeout,120000},
{max_sessions,2},
{cookies,disabled},
{verbose,false},
{ipfamily,inet},
{ip,default},
{port,default},
{socket_opts,[]},
{unix_socket,undefined}]}