diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 0e53be4f..00000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-# Python CircleCI 2.0 configuration file
-# Updating CircleCI configuration from v1 to v2
-# Check https://circleci.com/docs/2.0/language-python/ for more details
-#
-version: 2
-jobs:
-  build:
-    machine: true
-    steps:
-      - checkout
-      - run:
-          name: build images
-          command: |
-            docker build -t jupyterhub/jupyterhub .
-            docker build -t jupyterhub/jupyterhub-onbuild onbuild
-            docker build -t jupyterhub/jupyterhub:alpine -f dockerfiles/Dockerfile.alpine .
-            docker build -t jupyterhub/singleuser singleuser
-      - run:
-          name: smoke test jupyterhub
-          command: |
-            docker run --rm -it jupyterhub/jupyterhub jupyterhub --help
-      - run:
-          name: verify static files
-          command: |
-            docker run --rm -it -v $PWD/dockerfiles:/io jupyterhub/jupyterhub python3 /io/test.py
-
-# Tell CircleCI to use this workflow when it builds the site
-workflows:
-  version: 2
-  default:
-    jobs:
-      - build
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index a172ee5c..bbee9967 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -66,3 +66,120 @@ jobs:
         run: |
           pip install twine
           twine upload --skip-existing dist/*
+
+  publish-docker:
+    runs-on: ubuntu-20.04
+
+    services:
+      # So that we can test this in PRs/branches
+      local-registry:
+        image: registry:2
+        ports:
+          - 5000:5000
+
+    steps:
+      - name: Should we push this image to a public registry?
+        run: |
+          if [ "${{ startsWith(github.ref, 'refs/tags/') || (github.ref == 'refs/heads/master') }}" = "true" ]; then
+              # Empty => Docker Hub
+              echo "REGISTRY=" >> $GITHUB_ENV
+          else
+              echo "REGISTRY=localhost:5000/" >> $GITHUB_ENV
+          fi
+
+      - uses: actions/checkout@v2
+
+      # Setup docker to build for multiple platforms, see:
+      # https://github.com/docker/build-push-action/tree/v2.4.0#usage
+      # https://github.com/docker/build-push-action/blob/v2.4.0/docs/advanced/multi-platform.md
+
+      - name: Set up QEMU (for docker buildx)
+        uses: docker/setup-qemu-action@25f0500ff22e406f7191a2a8ba8cda16901ca018 # associated tag: v1.0.2
+
+      - name: Set up Docker Buildx (for multi-arch builds)
+        uses: docker/setup-buildx-action@2a4b53665e15ce7d7049afb11ff1f70ff1610609 # associated tag: v1.1.2
+        with:
+          # Allows pushing to registry on localhost:5000
+          driver-opts: network=host
+
+      - name: Setup push rights to Docker Hub
+        # This was setup by...
+        # 1. Creating a Docker Hub service account "jupyterhubbot"
+        # 2. Creating a access token for the service account specific to this
+        #    repository: https://hub.docker.com/settings/security
+        # 3. Making the account part of the "bots" team, and granting that team
+        #    permissions to push to the relevant images:
+        #    https://hub.docker.com/orgs/jupyterhub/teams/bots/permissions
+        # 4. Registering the username and token as a secret for this repo:
+        #    https://github.com/jupyterhub/jupyterhub/settings/secrets/actions
+        if: env.REGISTRY != 'localhost:5000/'
+        run: |
+          docker login -u "${{ secrets.DOCKER_USERNAME }}" -p "${{ secrets.DOCKERHUB_TOKEN }}"
+
+      # https://github.com/jupyterhub/action-major-minor-tag-calculator
+      # If this is a tagged build this will return additional parent tags.
+      # E.g. 1.2.3 is expanded to Docker tags
+      # [{prefix}:1.2.3, {prefix}:1.2, {prefix}:1, {prefix}:latest] unless
+      # this is a backported tag in which case the newer tags aren't updated.
+      # For branches this will return the branch name.
+      # If GITHUB_TOKEN isn't available (e.g. in PRs) returns no tags [].
+      - name: Get list of jupyterhub tags
+        id: jupyterhubtags
+        uses: jupyterhub/action-major-minor-tag-calculator@v1
+        with:
+          githubToken: ${{ secrets.GITHUB_TOKEN }}
+          prefix: "${{ env.REGISTRY }}jupyterhub/jupyterhub:"
+          defaultTag: "${{ env.REGISTRY }}jupyterhub/jupyterhub:noref"
+
+      - name: Build and push jupyterhub
+        uses: docker/build-push-action@e1b7f96249f2e4c8e4ac1519b9608c0d48944a1f # associated tag: v2.4.0
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          # tags parameter must be a string input so convert `gettags` JSON
+          # array into a comma separated list of tags
+          tags: ${{ join(fromJson(steps.jupyterhubtags.outputs.tags)) }}
+
+      # jupyterhub-onbuild
+
+      - name: Get list of jupyterhub-onbuild tags
+        id: onbuildtags
+        uses: jupyterhub/action-major-minor-tag-calculator@v1
+        with:
+          githubToken: ${{ secrets.GITHUB_TOKEN }}
+          prefix: "${{ env.REGISTRY }}jupyterhub/jupyterhub-onbuild:"
+          defaultTag: "${{ env.REGISTRY }}jupyterhub/jupyterhub-onbuild:noref"
+
+      - name: Build and push jupyterhub-onbuild
+        uses: docker/build-push-action@e1b7f96249f2e4c8e4ac1519b9608c0d48944a1f # associated tag: v2.4.0
+        with:
+          build-args: |
+            BASE_IMAGE=${{ fromJson(steps.jupyterhubtags.outputs.tags)[0] }}
+          context: onbuild
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ join(fromJson(steps.onbuildtags.outputs.tags)) }}
+
+      # jupyterhub-demo
+
+      - name: Get list of jupyterhub-demo tags
+        id: demotags
+        uses: jupyterhub/action-major-minor-tag-calculator@v1
+        with:
+          githubToken: ${{ secrets.GITHUB_TOKEN }}
+          prefix: "${{ env.REGISTRY }}jupyterhub/jupyterhub-demo:"
+          defaultTag: "${{ env.REGISTRY }}jupyterhub/jupyterhub-demo:noref"
+
+      - name: Build and push jupyterhub-demo
+        uses: docker/build-push-action@e1b7f96249f2e4c8e4ac1519b9608c0d48944a1f # associated tag: v2.4.0
+        with:
+          build-args: |
+            BASE_IMAGE=${{ fromJson(steps.onbuildtags.outputs.tags)[0] }}
+          context: demo-image
+          # linux/arm64 currently fails:
+          # ERROR: Could not build wheels for argon2-cffi which use PEP 517 and cannot be installed directly
+          # ERROR: executor failed running [/bin/sh -c python3 -m pip install notebook]: exit code: 1
+          platforms: linux/amd64
+          push: true
+          tags: ${{ join(fromJson(steps.demotags.outputs.tags)) }}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6e83e381..a67c7bdf 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -222,3 +222,25 @@ jobs:
       - name: Submit codecov report
         run: |
           codecov
+
+  docker-build:
+    runs-on: ubuntu-20.04
+    timeout-minutes: 10
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: build images
+        run: |
+          docker build -t jupyterhub/jupyterhub .
+          docker build -t jupyterhub/jupyterhub-onbuild onbuild
+          docker build -t jupyterhub/jupyterhub:alpine -f dockerfiles/Dockerfile.alpine .
+          docker build -t jupyterhub/singleuser singleuser
+
+      - name: smoke test jupyterhub
+        run: |
+          docker run --rm -t jupyterhub/jupyterhub jupyterhub --help
+
+      - name: verify static files
+        run: |
+          docker run --rm -t -v $PWD/dockerfiles:/io jupyterhub/jupyterhub python3 /io/test.py
diff --git a/Dockerfile b/Dockerfile
index ab7fca68..1290e05a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,7 +21,7 @@
 # your jupyterhub_config.py will be added automatically
 # from your docker directory.
 
-ARG BASE_IMAGE=ubuntu:focal-20200729@sha256:6f2fb2f9fb5582f8b587837afd6ea8f37d8d1d9e41168c90f410a6ef15fa8ce5
+ARG BASE_IMAGE=ubuntu:focal-20200729
 FROM $BASE_IMAGE AS builder
 
 USER root
diff --git a/docs/rest-api.yml b/docs/rest-api.yml
index 9f40f6da..49963d54 100644
--- a/docs/rest-api.yml
+++ b/docs/rest-api.yml
@@ -3,7 +3,7 @@ swagger: "2.0"
 info:
   title: JupyterHub
   description: The REST API for JupyterHub
-  version: 1.2.0dev
+  version: 1.4.0
   license:
     name: BSD-3-Clause
 schemes: [http, https]
diff --git a/docs/source/changelog.md b/docs/source/changelog.md
index b12a018a..fd2be09a 100644
--- a/docs/source/changelog.md
+++ b/docs/source/changelog.md
@@ -13,6 +13,8 @@ and new configuration options.
 
 There are no database schema changes requiring migration from 1.3 to 1.4.
 
+1.4 is also the first version to start publishing docker images for arm64.
+
 In particular, OAuth tokens stored in user cookies,
 used for accessing single-user servers and hub-authenticated services,
 have changed their expiration from one hour to the expiry of the cookie
@@ -22,13 +24,17 @@ This is now also configurable via `JupyterHub.oauth_token_expires_in`.
 The result is that it should be much less likely for auth tokens stored in cookies
 to expire during the lifetime of a server.
 
-### 1.4.0
+### 1.4.0 2021-04-19
 
-([full changelog](https://github.com/jupyterhub/jupyterhub/compare/1.3.0...6121411aec529bac40f2535591ae36d1fc0e8df0))
+([full changelog](https://github.com/jupyterhub/jupyterhub/compare/1.3.0...1.4.0))
 
 #### New features added
 
+- Support Proxy.extra_routes [#3430](https://github.com/jupyterhub/jupyterhub/pull/3430) ([@yuvipanda](https://github.com/yuvipanda))
+- login-template: Add a "login_container" block inside the div-container. [#3422](https://github.com/jupyterhub/jupyterhub/pull/3422) ([@olifre](https://github.com/olifre))
+- Docker arm64 builds [#3421](https://github.com/jupyterhub/jupyterhub/pull/3421) ([@manics](https://github.com/manics))
 - make oauth token expiry configurable [#3411](https://github.com/jupyterhub/jupyterhub/pull/3411) ([@minrk](https://github.com/minrk))
+- allow the hub to not be the default route [#3373](https://github.com/jupyterhub/jupyterhub/pull/3373) ([@minrk](https://github.com/minrk))
 - Allow customization of service menu via templates [#3345](https://github.com/jupyterhub/jupyterhub/pull/3345) ([@stv0g](https://github.com/stv0g))
 - Add Spawner.delete_forever [#3337](https://github.com/jupyterhub/jupyterhub/pull/3337) ([@nsshah1288](https://github.com/nsshah1288))
 - Allow to set spawner-specific hub connect URL [#3326](https://github.com/jupyterhub/jupyterhub/pull/3326) ([@dtaniwaki](https://github.com/dtaniwaki))
@@ -36,6 +42,7 @@ to expire during the lifetime of a server.
 
 #### Enhancements made
 
+- Log the exception raised in Spawner.post_stop_hook instead of raising it [#3418](https://github.com/jupyterhub/jupyterhub/pull/3418) ([@jiajunjie](https://github.com/jiajunjie))
 - Don't delete all oauth clients on startup [#3407](https://github.com/jupyterhub/jupyterhub/pull/3407) ([@yuvipanda](https://github.com/yuvipanda))
 - Use 'secrets' module to generate secrets [#3394](https://github.com/jupyterhub/jupyterhub/pull/3394) ([@yuvipanda](https://github.com/yuvipanda))
 - Allow cookie_secret to be set to a hexadecimal string [#3343](https://github.com/jupyterhub/jupyterhub/pull/3343) ([@consideRatio](https://github.com/consideRatio))
@@ -51,6 +58,9 @@ to expire during the lifetime of a server.
 
 #### Maintenance and upkeep improvements
 
+- typos in onbuild, demo images for push [#3429](https://github.com/jupyterhub/jupyterhub/pull/3429) ([@minrk](https://github.com/minrk))
+- Disable docker jupyterhub-demo arm64 build [#3425](https://github.com/jupyterhub/jupyterhub/pull/3425) ([@manics](https://github.com/manics))
+- Docker arm64 builds [#3421](https://github.com/jupyterhub/jupyterhub/pull/3421) ([@manics](https://github.com/manics))
 - avoid deprecated engine.table_names [#3392](https://github.com/jupyterhub/jupyterhub/pull/3392) ([@minrk](https://github.com/minrk))
 - alpine dockerfile: avoid compilation by getting some deps from apk [#3386](https://github.com/jupyterhub/jupyterhub/pull/3386) ([@minrk](https://github.com/minrk))
 - Fix sqlachemy.interfaces.PoolListener deprecation for tests [#3383](https://github.com/jupyterhub/jupyterhub/pull/3383) ([@IvanaH8](https://github.com/IvanaH8))
@@ -65,6 +75,10 @@ to expire during the lifetime of a server.
 
 #### Documentation improvements
 
+- DOC: Conform to numpydoc. [#3428](https://github.com/jupyterhub/jupyterhub/pull/3428) ([@Carreau](https://github.com/Carreau))
+- Fix link to jupyterhub/jupyterhub-the-hard-way [#3417](https://github.com/jupyterhub/jupyterhub/pull/3417) ([@manics](https://github.com/manics))
+- Changelog for 1.4 [#3415](https://github.com/jupyterhub/jupyterhub/pull/3415) ([@minrk](https://github.com/minrk))
+- Fastapi example [#3403](https://github.com/jupyterhub/jupyterhub/pull/3403) ([@kafonek](https://github.com/kafonek))
 - Added Azure AD as a supported authenticator. [#3401](https://github.com/jupyterhub/jupyterhub/pull/3401) ([@maxshowarth](https://github.com/maxshowarth))
 - Remove the hard way guide [#3375](https://github.com/jupyterhub/jupyterhub/pull/3375) ([@manics](https://github.com/manics))
 - :memo: Fix telemetry section [#3333](https://github.com/jupyterhub/jupyterhub/pull/3333) ([@trallard](https://github.com/trallard))
@@ -75,9 +89,9 @@ to expire during the lifetime of a server.
 
 #### Contributors to this release
 
-([GitHub contributors page for this release](https://github.com/jupyterhub/jupyterhub/graphs/contributors?from=2020-12-11&to=2021-04-12&type=c))
+([GitHub contributors page for this release](https://github.com/jupyterhub/jupyterhub/graphs/contributors?from=2020-12-11&to=2021-04-19&type=c))
 
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 ### 1.3
 
@@ -1027,7 +1041,8 @@ Fix removal of `/login` page in 0.4.0, breaking some OAuth providers.
 
 First preview release
 
-[unreleased]: https://github.com/jupyterhub/jupyterhub/compare/1.3.0...HEAD
+[unreleased]: https://github.com/jupyterhub/jupyterhub/compare/1.4.0...HEAD
+[1.4.0]: https://github.com/jupyterhub/jupyterhub/compare/1.3.0...1.4.0
 [1.3.0]: https://github.com/jupyterhub/jupyterhub/compare/1.2.1...1.3.0
 [1.2.2]: https://github.com/jupyterhub/jupyterhub/compare/1.2.1...1.2.2
 [1.2.1]: https://github.com/jupyterhub/jupyterhub/compare/1.2.0...1.2.1
diff --git a/hooks/README.md b/hooks/README.md
deleted file mode 100644
index 6cdbadad..00000000
--- a/hooks/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Docker Cloud build hooks
-
-These are the hooks
diff --git a/hooks/post_build b/hooks/post_build
deleted file mode 100755
index 70d712e2..00000000
--- a/hooks/post_build
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-set -exuo pipefail
-
-# build jupyterhub-onbuild image
-docker build --build-arg BASE_IMAGE=$DOCKER_REPO:$DOCKER_TAG -t ${DOCKER_REPO}-onbuild:$DOCKER_TAG onbuild
-# build jupyterhub-demo image
-docker build --build-arg BASE_IMAGE=${DOCKER_REPO}-onbuild:$DOCKER_TAG -t ${DOCKER_REPO}-demo:$DOCKER_TAG demo-image
diff --git a/hooks/post_push b/hooks/post_push
deleted file mode 100755
index 4db84638..00000000
--- a/hooks/post_push
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/bin/bash
-set -exuo pipefail
-
-export ONBUILD=${DOCKER_REPO}-onbuild
-export DEMO=${DOCKER_REPO}-demo
-export REPOS="${DOCKER_REPO} ${ONBUILD} ${DEMO}"
-# push ONBUILD image
-docker push $ONBUILD:$DOCKER_TAG
-docker push $DEMO:$DOCKER_TAG
-
-function get_hub_version() {
-  rm -f hub_version
-  docker run --rm -v $PWD:/version -u $(id -u) -i $DOCKER_REPO:$DOCKER_TAG sh -c 'jupyterhub --version > /version/hub_version'
-  hub_xyz=$(cat hub_version)
-  split=( ${hub_xyz//./ } )
-  hub_xy="${split[0]}.${split[1]}"
-  # add .dev on hub_xy so it's 1.0.dev
-  if [[ ! -z "${split[3]:-}" ]]; then
-    hub_xy="${hub_xy}.${split[3]}"
-    latest=0
-  else
-    latest=1
-  fi
-}
-
-get_hub_version
-
-for repo in ${REPOS}; do
-  # when building master, push 0.9.0.dev as well
-  docker tag $repo:$DOCKER_TAG $repo:$hub_xyz
-  docker push $repo:$hub_xyz
-
-  # when building 0.9.x, push 0.9 as well
-  docker tag $repo:$DOCKER_TAG $repo:$hub_xy
-  docker push $repo:$hub_xy
-
-  # if building a stable release, tag latest as well
-  if [[ "$latest" == "1" ]]; then
-    docker tag $repo:$DOCKER_TAG $repo:latest
-    docker push $repo:latest
-  fi
-done
diff --git a/jupyterhub/app.py b/jupyterhub/app.py
index 76dd0df3..86d904ef 100644
--- a/jupyterhub/app.py
+++ b/jupyterhub/app.py
@@ -885,6 +885,66 @@ class JupyterHub(Application):
     def _hub_prefix_default(self):
         return url_path_join(self.base_url, '/hub/')
 
+    hub_routespec = Unicode(
+        "/",
+        help="""
+        The routing prefix for the Hub itself.
+        
+        Override to send only a subset of traffic to the Hub.
+        Default is to use the Hub as the default route for all requests.
+
+        This is necessary for normal jupyterhub operation,
+        as the Hub must receive requests for e.g. `/user/:name`
+        when the user's server is not running.
+
+        However, some deployments using only the JupyterHub API
+        may want to handle these events themselves,
+        in which case they can register their own default target with the proxy
+        and set e.g. `hub_routespec = /hub/` to serve only the hub's own pages, or even `/hub/api/` for api-only operation.
+        
+        Note: hub_routespec must include the base_url, if any.
+
+        .. versionadded:: 1.4
+        """,
+    ).tag(config=True)
+
+    @default("hub_routespec")
+    def _default_hub_routespec(self):
+        # Default routespec for the Hub is the *app* base url
+        # not the hub URL, so the Hub receives requests for non-running servers
+        # use `/` with host-based routing so the Hub
+        # gets requests for all hosts
+        if self.subdomain_host:
+            routespec = '/'
+        else:
+            routespec = self.base_url
+        return routespec
+
+    @validate("hub_routespec")
+    def _validate_hub_routespec(self, proposal):
+        """ensure leading/trailing / on custom routespec prefix
+
+        - trailing '/' always required
+        - leading '/' required unless using subdomains
+        """
+        routespec = proposal.value
+        if not routespec.endswith("/"):
+            routespec = routespec + "/"
+        if not self.subdomain_host and not routespec.startswith("/"):
+            routespec = "/" + routespec
+        return routespec
+
+    @observe("hub_routespec")
+    def _hub_routespec_changed(self, change):
+        if change.new == change.old:
+            return
+        routespec = change.new
+        if routespec not in {'/', self.base_url}:
+            self.log.warning(
+                f"Using custom route for Hub: {routespec}."
+                " Requests for not-running servers may not be handled."
+            )
+
     @observe('base_url')
     def _update_hub_prefix(self, change):
         """add base URL to hub prefix"""
@@ -1718,6 +1778,7 @@ class JupyterHub(Application):
         """Load the Hub URL config"""
         hub_args = dict(
             base_url=self.hub_prefix,
+            routespec=self.hub_routespec,
             public_host=self.subdomain_host,
             certfile=self.internal_ssl_cert,
             keyfile=self.internal_ssl_key,
@@ -1733,17 +1794,15 @@ class JupyterHub(Application):
             hub_args['ip'] = self.hub_ip
             hub_args['port'] = self.hub_port
 
-        # routespec for the Hub is the *app* base url
-        # not the hub URL, so it receives requests for non-running servers
-        # use `/` with host-based routing so the Hub
-        # gets requests for all hosts
-        host = ''
-        if self.subdomain_host:
-            routespec = '/'
-        else:
-            routespec = self.base_url
+        self.hub = Hub(**hub_args)
 
-        self.hub = Hub(routespec=routespec, **hub_args)
+        if not self.subdomain_host:
+            api_prefix = url_path_join(self.hub.base_url, "api/")
+            if not api_prefix.startswith(self.hub.routespec):
+                self.log.warning(
+                    f"Hub API prefix {api_prefix} not on prefix {self.hub.routespec}. "
+                    "The Hub may not receive any API requests from outside."
+                )
 
         if self.hub_connect_ip:
             self.hub.connect_ip = self.hub_connect_ip
diff --git a/jupyterhub/dbutil.py b/jupyterhub/dbutil.py
index e3fc7850..fd67e941 100644
--- a/jupyterhub/dbutil.py
+++ b/jupyterhub/dbutil.py
@@ -26,10 +26,9 @@ def write_alembic_ini(alembic_ini='alembic.ini', db_url='sqlite:///jupyterhub.sq
 
     Parameters
     ----------
-
-    alembic_ini: str
+    alembic_ini : str
         path to the alembic.ini file that should be written.
-    db_url: str
+    db_url : str
         The SQLAlchemy database url, e.g. `sqlite:///jupyterhub.sqlite`.
     """
     with open(ALEMBIC_INI_TEMPLATE_PATH) as f:
@@ -58,13 +57,11 @@ def _temp_alembic_ini(db_url):
 
     Parameters
     ----------
-
-    db_url: str
+    db_url : str
         The SQLAlchemy database url, e.g. `sqlite:///jupyterhub.sqlite`.
 
     Returns
     -------
-
     alembic_ini: str
         The path to the temporary alembic.ini that we have created.
         This file will be cleaned up on exit from the context manager.
diff --git a/jupyterhub/handlers/metrics.py b/jupyterhub/handlers/metrics.py
index 0f63d9c3..d2f0b03b 100644
--- a/jupyterhub/handlers/metrics.py
+++ b/jupyterhub/handlers/metrics.py
@@ -1,3 +1,4 @@
+"""Handlers for serving prometheus metrics"""
 from prometheus_client import CONTENT_TYPE_LATEST
 from prometheus_client import generate_latest
 from prometheus_client import REGISTRY
@@ -17,4 +18,7 @@ class MetricsHandler(BaseHandler):
         self.write(generate_latest(REGISTRY))
 
 
-default_handlers = [(r'/metrics$', MetricsHandler)]
+default_handlers = [
+    (r'/metrics$', MetricsHandler),
+    (r'/api/metrics$', MetricsHandler),
+]
diff --git a/jupyterhub/handlers/pages.py b/jupyterhub/handlers/pages.py
index 356aae71..3d2b03f6 100644
--- a/jupyterhub/handlers/pages.py
+++ b/jupyterhub/handlers/pages.py
@@ -676,4 +676,5 @@ default_handlers = [
     (r'/token', TokenPageHandler),
     (r'/error/(\d+)', ProxyErrorHandler),
     (r'/health$', HealthCheckHandler),
+    (r'/api/health$', HealthCheckHandler),
 ]
diff --git a/jupyterhub/proxy.py b/jupyterhub/proxy.py
index cf707d6f..82587191 100644
--- a/jupyterhub/proxy.py
+++ b/jupyterhub/proxy.py
@@ -32,6 +32,7 @@ from tornado.ioloop import PeriodicCallback
 from traitlets import Any
 from traitlets import Bool
 from traitlets import default
+from traitlets import Dict
 from traitlets import Instance
 from traitlets import Integer
 from traitlets import observe
@@ -112,6 +113,26 @@ class Proxy(LoggingConfigurable):
         """,
     )
 
+    extra_routes = Dict(
+        {},
+        config=True,
+        help="""
+        Additional routes to be maintained in the proxy.
+
+        A dictionary with a route specification as key, and
+        a URL as target. The hub will ensure this route is present
+        in the proxy.
+
+        If the hub is running in host based mode (with 
+        JupyterHub.subdomain_host set), the routespec *must*
+        have a domain component (example.com/my-url/). If the
+        hub is not running in host based mode, the routespec
+        *must not* have a domain component (/my-url/).
+
+        Helpful when the hub is running in API-only mode.
+        """,
+    )
+
     def start(self):
         """Start the proxy.
 
@@ -330,7 +351,7 @@ class Proxy(LoggingConfigurable):
             route = routes[self.app.hub.routespec]
             if route['target'] != hub.host:
                 self.log.warning(
-                    "Updating default route %s → %s", route['target'], hub.host
+                    "Updating Hub route %s → %s", route['target'], hub.host
                 )
                 futures.append(self.add_hub_route(hub))
 
@@ -384,6 +405,11 @@ class Proxy(LoggingConfigurable):
                     )
                     futures.append(self.add_service(service))
 
+        # Add extra routes we've been configured for
+        for routespec, url in self.extra_routes.items():
+            good_routes.add(routespec)
+            futures.append(self.add_route(routespec, url, {'extra': True}))
+
         # Now delete the routes that shouldn't be there
         for routespec in routes:
             if routespec not in good_routes:
@@ -396,7 +422,7 @@ class Proxy(LoggingConfigurable):
 
     def add_hub_route(self, hub):
         """Add the default route for the Hub"""
-        self.log.info("Adding default route for Hub: %s => %s", hub.routespec, hub.host)
+        self.log.info("Adding route for Hub: %s => %s", hub.routespec, hub.host)
         return self.add_route(hub.routespec, self.hub.host, {'hub': True})
 
     async def restore_routes(self):
diff --git a/jupyterhub/services/auth.py b/jupyterhub/services/auth.py
index 7b7320cb..bcc8a57b 100644
--- a/jupyterhub/services/auth.py
+++ b/jupyterhub/services/auth.py
@@ -668,12 +668,15 @@ class HubOAuth(HubAuth):
 
         Parameters
         ----------
-        handler (RequestHandler): A tornado RequestHandler
-        next_url (str): The page to redirect to on successful login
+        handler : RequestHandler
+            A tornado RequestHandler
+        next_url : str
+            The page to redirect to on successful login
 
         Returns
         -------
-        state (str): The OAuth state that has been stored in the cookie (url safe, base64-encoded)
+        state : str
+            The OAuth state that has been stored in the cookie (url safe, base64-encoded)
         """
         extra_state = {}
         if handler.get_cookie(self.state_cookie_name):
@@ -710,7 +713,8 @@ class HubOAuth(HubAuth):
 
         Parameters
         ----------
-        next_url (str): The URL of the page to redirect to on successful login.
+        next_url : str
+            The URL of the page to redirect to on successful login.
 
         Returns
         -------
diff --git a/jupyterhub/spawner.py b/jupyterhub/spawner.py
index dc335d47..ead537d6 100644
--- a/jupyterhub/spawner.py
+++ b/jupyterhub/spawner.py
@@ -729,7 +729,7 @@ class Spawner(LoggingConfigurable):
         Returns
         -------
         state: dict
-             a JSONable dict of state
+            a JSONable dict of state
         """
         state = {}
         return state
diff --git a/jupyterhub/tests/test_app.py b/jupyterhub/tests/test_app.py
index 06c18ba7..47f54165 100644
--- a/jupyterhub/tests/test_app.py
+++ b/jupyterhub/tests/test_app.py
@@ -1,5 +1,6 @@
 """Test the JupyterHub entry point"""
 import binascii
+import logging
 import os
 import re
 import sys
@@ -329,3 +330,41 @@ def test_url_config(hub_config, expected):
     # validate additional properties
     for key, value in expected.items():
         assert getattr(app, key) == value
+
+
+@pytest.mark.parametrize(
+    "base_url, hub_routespec, expected_routespec, should_warn, bad_prefix",
+    [
+        (None, None, "/", False, False),
+        ("/", "/", "/", False, False),
+        ("/base", "/base", "/base/", False, False),
+        ("/", "/hub", "/hub/", True, False),
+        (None, "hub/api", "/hub/api/", True, False),
+        ("/base", "/hub/", "/hub/", True, True),
+        (None, "/hub/api/health", "/hub/api/health/", True, True),
+    ],
+)
+def test_hub_routespec(
+    base_url, hub_routespec, expected_routespec, should_warn, bad_prefix, caplog
+):
+    cfg = Config()
+    if base_url:
+        cfg.JupyterHub.base_url = base_url
+    if hub_routespec:
+        cfg.JupyterHub.hub_routespec = hub_routespec
+    with caplog.at_level(logging.WARNING):
+        app = JupyterHub(config=cfg, log=logging.getLogger())
+        app.init_hub()
+    hub = app.hub
+    assert hub.routespec == expected_routespec
+
+    if should_warn:
+        assert "custom route for Hub" in caplog.text
+        assert hub_routespec in caplog.text
+    else:
+        assert "custom route for Hub" not in caplog.text
+
+    if bad_prefix:
+        assert "may not receive" in caplog.text
+    else:
+        assert "may not receive" not in caplog.text
diff --git a/jupyterhub/tests/test_proxy.py b/jupyterhub/tests/test_proxy.py
index 60f2d0e0..34af5c1d 100644
--- a/jupyterhub/tests/test_proxy.py
+++ b/jupyterhub/tests/test_proxy.py
@@ -195,6 +195,25 @@ async def test_check_routes(app, username, disable_check_routes):
     assert before == after
 
 
+async def test_extra_routes(app):
+    proxy = app.proxy
+    # When using host_routing, it's up to the admin to
+    # provide routespecs that have a domain in them.
+    # We don't explicitly validate that here.
+    if app.subdomain_host:
+        route_spec = 'example.com/test-extra-routes/'
+    else:
+        route_spec = '/test-extra-routes/'
+    target = 'http://localhost:9999/test'
+    proxy.extra_routes = {route_spec: target}
+
+    await proxy.check_routes(app.users, app._service_map)
+
+    routes = await app.proxy.get_all_routes()
+    assert route_spec in routes
+    assert routes[route_spec]['target'] == target
+
+
 @pytest.mark.parametrize(
     "routespec",
     [
diff --git a/jupyterhub/tests/utils.py b/jupyterhub/tests/utils.py
index dd47f93f..73ddcf51 100644
--- a/jupyterhub/tests/utils.py
+++ b/jupyterhub/tests/utils.py
@@ -72,9 +72,8 @@ def check_db_locks(func):
     The decorator relies on an instance of JupyterHubApp being the first
     argument to the decorated function.
 
-    Example
-    -------
-
+    Examples
+    --------
         @check_db_locks
         def api_request(app, *api_path, **kwargs):
 
diff --git a/onbuild/README.md b/onbuild/README.md
index fae5e4fb..e1d6696e 100644
--- a/onbuild/README.md
+++ b/onbuild/README.md
@@ -2,7 +2,7 @@
 
 If you base a Dockerfile on this image:
 
-    FROM jupyterhub/jupyterhub-onbuild:0.6
+    FROM jupyterhub/jupyterhub-onbuild:1.4.0
     ...
 
 then your `jupyterhub_config.py` adjacent to your Dockerfile will be loaded into the image and used by JupyterHub.
diff --git a/share/jupyterhub/templates/login.html b/share/jupyterhub/templates/login.html
index 98d43dc8..153a6c27 100644
--- a/share/jupyterhub/templates/login.html
+++ b/share/jupyterhub/templates/login.html
@@ -10,6 +10,7 @@
 
 {% block login %}
 <div id="login-main" class="container">
+{% block login_container %}
 {% if custom_html %}
 {{ custom_html | safe }}
 {% elif login_service %}
@@ -83,6 +84,7 @@
   </div>
 </form>
 {% endif %}
+{% endblock login_container %}
 </div>
 {% endblock login %}