Name: configurable-http-proxy
Owner: CyVerse Discovery Environment
Description: node-http-proxy plus a REST API
Forked from: jupyterhub/configurable-http-proxy
Created: 2017-06-14 15:21:13.0
Updated: 2017-06-14 15:21:14.0
Pushed: 2017-06-12 14:06:43.0
Homepage: null
Size: 304
Language: JavaScript
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Install | Usage | Using the REST API | Custom error pages | Host-based routing | Troubleshooting
configurable-http-proxy (CHP) provides you with a way to update and manage a proxy table using a command line interface or REST API. It is a simple wrapper around node-http-proxy. node-http-proxy is an HTTP programmable proxying library that supports websockets and is suitable for implementing components such as reverse proxies and load balancers. By wrapping node-http-proxy, configurable-http-proxy extends this functionality to JupyterHub deployments.
Prerequisite:
Node.js ? 4
Note: Ubuntu < 16.04 and Debian Jessie ship with too-old versions of Node and must be upgraded. We recommend using the latest stable or LTS version of Node.
To install the configurable-http-proxy package globally
using npm:
npm install -g configurable-http-proxy
To install from the source code found in this GitHub repo:
git clone https://github.com/jupyterhub/configurable-http-proxy
cd configurable-http-proxy
npm install # Use 'npm install -g' for global install
The configurable proxy runs two HTTP(S) servers:
--ip,
--port) listens on all interfaces by default.--api-ip, --api-port) listens on
localhost by default. The REST API uses token authorization, where the
token is set by the CONFIGPROXY_AUTH_TOKEN environment variable.
When you start the proxy from the command line, you can set a
default target (--default-target option) which will be used when no
matching route is found in the proxy table:
configurable-http-proxy --default-target=http://localhost:8888
age: configurable-http-proxy [options]
tions:
-h, --help output usage information
-V, --version output the version number
--ip <ip-address> Public-facing IP of the proxy
--port <n> (defaults to 8000) Public-facing port of the proxy
--ssl-key <keyfile> SSL key to use, if any
--ssl-cert <certfile> SSL certificate to use, if any
--ssl-ca <ca-file> SSL certificate authority, if any
--ssl-request-cert Request SSL certs to authenticate clients
--ssl-reject-unauthorized Reject unauthorized SSL connections (only meaningful if --ssl-request-cert is given)
--ssl-protocol <ssl-protocol> Set specific HTTPS protocol, e.g. TLSv1_2, TLSv1, etc.
--ssl-ciphers <ciphers> `:`-separated ssl cipher list. Default excludes RC4
--ssl-allow-rc4 Allow RC4 cipher for SSL (disabled by default)
--ssl-dhparam <dhparam-file> SSL Diffie-Helman Parameters pem file, if any
--api-ip <ip> Inward-facing IP for API requests
--api-port <n> Inward-facing port for API requests (defaults to --port=value+1)
--api-ssl-key <keyfile> SSL key to use, if any, for API requests
--api-ssl-cert <certfile> SSL certificate to use, if any, for API requests
--api-ssl-ca <ca-file> SSL certificate authority, if any, for API requests
--api-ssl-request-cert Request SSL certs to authenticate clients for API requests
--api-ssl-reject-unauthorized Reject unauthorized SSL connections (only meaningful if --api-ssl-request-cert is given)
--default-target <host> Default proxy target (proto://host[:port])
--error-target <host> Alternate server for handling proxy errors (proto://host[:port])
--error-path <path> Alternate server for handling proxy errors (proto://host[:port])
--redirect-port <redirect-port> Redirect HTTP requests on this port to the server on HTTPS
--pid-file <pid-file> Write our PID to a file
--no-x-forward Don't add 'X-forward-' headers to proxied requests
--no-prepend-path Avoid prepending target paths to proxied requests
--no-include-prefix Don't include the routing prefix in proxied requests
--insecure Disable SSL cert verification
--host-routing Use host routing (host as first level of path)
--statsd-host <host> Host to send statsd statistics to
--statsd-port <port> Port to send statsd statistics to
--statsd-prefix <prefix> Prefix to use for statsd statistics
--log-level <loglevel> Log level (debug, info, warn, error)
--proxy-timeout <n> Timeout (in millis) when proxy receives no response from target
The configurable-http-proxy REST API is documented and available as:
API Root
| HTTP method | Endpoint | Function | |————-|———-|———-| | GET | /api/ | API Root |
Routes
| HTTP method | Endpoint | Function | |————-|————————–|————————————-| | GET | /api/routes | Get all routes in routing table | | POST | /api/routes/{route_spec} | Add a new route | | DELETE | /api/routes/{route_spec} | Remove the given route |
The REST API is authenticated via passing a token in the Authorization
header. The API is served under the /api/routes base URL.
For example, this curl command entered in the terminal
passes this header "Authorization: token $CONFIGPROXY_AUTH_TOKEN" for
authentication and this endpoint http://localhost:8001/api/routes to
retrieve the current routing table:
curl -H "Authorization: token $CONFIGPROXY_AUTH_TOKEN" http://localhost:8001/api/routes
Request:
GET /api/routes[?inactive_since=ISO8601-timestamp]
Parameters:
inactive_since: If the inactive_since URL
parameter is given as an ISO8601
timestamp, only routes whose last_activity is earlier than the timestamp
will be returned. The last_activity timestamp is updated whenever the proxy
passes data to or from the proxy target.
Response:
Status code
status: 200 OK
Response body
A JSON dictionary of the current routing table. This JSON dictionary excludes the default route.
Behavior:
The current routing table is returned to the user if the request is successful.
POST requests create new routes. The body of the request should be a JSON
dictionary with at least one key: target, the target host to be proxied.
Request:
POST /api/routes/[:path]
Required input:
target: The host URL
Example request body:
user/fred": {
"target": "http://localhost:8002"
user/barbara": {
"target": "http://localhost:8003"
Response:
status: 201 Created
Behavior:
After adding the new route, any request to /path/prefix on the proxy's
public interface will be proxied to target.
Request:
DELETE /api/routes/[:path]
Response:
status: 204 No Content
Behavior:
Removes a route from the proxy's routing table.
Beginning with version 0.5, custom error pages can be provided when the proxy encounters an error and has no proxy target to handle a request. There are two typical errors that CHP may hit, along with their status code:
404: a client has requested a URL for which there is no routing target.
This can be prevented by setting a default target before starting
the configurable-http-proxy.
503: a route exists, but the upstream server isn't responding. This is more common, and can be due to any number of reasons, including the target service having died or not finished starting.
Specify an error path --error-path /usr/share/chp-errors when
starting the CHP:
configurable-http-proxy --error-path /usr/share/chp-errors
When a proxy error occurs, CHP will look in the following location for a custom html error page to serve:
/usr/share/chp-errors/{CODE}.html
where {CODE} is a status code number for an html page to serve. If there is
a 503 error, CHP will look for a custom error page in this location
/usr/share/chp-errors/503.html.
If no custom error html file exists for the error code, CHP will use the
error.html. If you specify an error path, make sure you also create
an error.html file.
You can specify a target to use when errors occur by using --error-target {URL}
when starting the CHP.
If, for example, CHP starts with --error-target http://localhost:1234,
then when the proxy encounters an error, it will make a GET request to
the error-target server, with URL http://localhost:1234 and status code
/{CODE}, and failing request's URL escaped in a URL parameter, e.g.:
GET /404?url=%2Fescaped%2Fpath
If the CHP is started with the --host-routing option, the proxy will
use the hostname of the incoming request to select a target.
When using host-based routes, the API uses the target in the same way as if the hostname were the first part of the URL path, e.g.:
example.com": "https://localhost:1234",
otherdomain.biz": "http://10.0.1.4:5555",
Q: My proxy is not starting. What could be happening?