I have a docker container running jenkins. As part of the build process, I need to access a web server that is run locally on the host machine. Is there a way the host web server (which can be configured to run on a port) can be exposed to the jenkins container?

EDIT: I'm running docker natively on a Linux machine.

UPDATE:

In addition to @larsks answer below, to get the IP address of the Host IP from the host machine, I do the following:

ip addr show docker0 | grep -Po 'inet K[d.]+'