Connect to host system Web API from Windows docker Container - docker

Question

I am running a web API on the host system and it's not exposed on public IP.
I want to access from a docker windows container running on the same system.
By initial analysis, it seems windows container does not support to access host system from within a container.
Tried to access API with the following address but on none of them are working.
https://host_system_ip:port/api/controller/action
https://default_gateway_ip:port/api/controller/action
https://localhost:port/api/controller/action
https://127.0.0.1:port/api/controller/action
For security reasons I cannot make that API to be accessed on public IP, the only host system and containers running on same host machine should be allowed to access web API.

Answer 1

This works fine for me from within container. Make sure you are on latest OS etc and nothing is missing.
PS C:\> docker run --rm microsoft/windowsservercore powershell invoke-webrequest 192.168.1.221 -useBasicParsing
StatusCode : 200
StatusDescription : OK
Content : Application 995184 and started on 3/21/2018 8:59:09 AM
RawContent : HTTP/1.1 200 OK
Content-Length: 54
Cache-Control: private
Content-Type: text/html; charset=utf-8
Date: Wed, 21 Mar 2018 14:01:22 GMT
Server: Microsoft-IIS/10.0
X-AspNet-Version: 4.0.30319
X-Pow...
Forms :
Headers : {[Content-Length, 54], [Cache-Control, private],
[Content-Type, text/html; charset=utf-8], [Date, Wed, 21
Mar 2018 14:01:22 GMT]...}
Images : {}
InputFields : {}
Links : {}
ParsedHtml :
RawContentLength : 54
PS C:\> ipconfig
Windows IP Configuration
Ethernet adapter vEthernet (nat):
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::94d6:434:c0b6:8fdc%56
IPv4 Address. . . . . . . . . . . : 172.29.112.1
Subnet Mask . . . . . . . . . . . : 255.255.240.0
Default Gateway . . . . . . . . . :
Ethernet adapter vEthernet (Internet):
Connection-specific DNS Suffix . : lan
Link-local IPv6 Address . . . . . : fe80::342a:be30:c7c:c1de%24
IPv4 Address. . . . . . . . . . . : 192.168.1.221
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1