从网络中的另一台计算机访问本地主机（在Mac OS X上运行）

Question

I have a REST service running on Mac OS X, which im currently accessing using " localhost:8888 " and " 10.0.2.2:8888 "

I want to access the same service from another computer which is in the same network.

I disabled the firewall also and I typed

 nc -v 192.168.1.3 8888

and got the result as

nc: connectx to 192.168.1.3 port 8888 (tcp) failed: Connection refused

currently i use localhost (to access using java application) and 10.0.2.2 (to access using android application runs in the simulator) which both runs on the same machine which the server runs too.

I want to put the android application to my phone and give the machine ip addess ( because if i connect to internet via wifi, it'll be in the same local area network) i should be able to access my service runs on my machine.

can some one please tell me what im doing wrong here? Thank you

Answer 1

You can't access localhost from your front end code. It needs to refer to the server's name or address.

Answer 2

The localhost address should be 127.0.0.1 , which is in the loopback range of addresses. Any address in the 127.0.0.0/8 block can never appear anywhere on any network, nor can any address in that block be used as a source or destination address outside a host. It is not possible for one host to access anything in that address range on another host.

The goes back at least as far as RFC 990, ASSIGNED NUMBERS :

The class A network number 127 is assigned the "loopback" function, that is, a datagram sent by a higher level protocol to a network 127 address should loop back inside the host. No datagram "sent" to a network 127 address should ever appear on any network anywhere.

RFC 1122, Requirements for Internet Hosts -- Communication Layers :

(g) { 127, }

Internal host loopback address. Addresses of this form MUST NOT appear outside a host.

Also RFC 3330, Special-Use IPv4 Addresses :

127.0.0.0/8 - This block is assigned for use as the Internet host loopback address. A datagram sent by a higher level protocol to an address anywhere within this block should loop back inside the host. This is ordinarily implemented using only 127.0.0.1/32 for loopback, but no addresses within this block should ever appear on any network anywhere [RFC1700, page 5].