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Helper library for Python+Vue Single Page Applications

Project description


A combined Python + Vue.js Single Page Application (SPA) framework.

Example usage (from vuespa/

  1. Write Python API:

     class Client(vuespa.Client):
         async def vuespa_on_open(self):
             print("Client connected!")
         # vuespa_on_close exists, too
         async def api_shoe(self, arg1):
             return f'Got {arg1}'
     vuespa.VueSpa('', Client).run()

    Optionally, may specify vuespa.VueSpa('', Client, port=8080).run() to run on ports 8080 (webserver and websocket) and 8081 (Vue dev server).

  2. Create app via vue create

  3. Edit (if typescript) with:

     declare var VueSpaBackend: any;
     Vue.use(VueSpaBackend); // or app.use(VueSpaBackend) for Vue 3+
  4. Edit with:

     <script src="<%= BASE_URL %>vuespa.js"></script>
  5. Save ./shims-vuespa.d.ts from this repository to, to silence Typescript errors.

  6. Add calls to the server as:

    await this.$'shoe', 32)

  7. Run the Python script! This will build the Vue application, run a Python web server on a random port, and point your web browser at the deployment.

As a shortcut in e.g. template callbacks, can use $vuespa.update('propName', 'shoe', 32) to place the call to api_shoe and then set the resulting value in propName.

Reverse proxy (Nginx) forwarding

python-vuespa uses a single port for both websocket and HTTP traffic. This makes it fairly simple to set up port forwarding, but with a reverse proxy, additional configuration may be necessary. Notably, to proxy from an SSL Nginx connection to a WSS secure websocket:

# WS must be separate
location / {
    proxy_read_timeout 3600;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";

location / {
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    #proxy_connect_timeout 3600;
    proxy_read_timeout 3600;

Note that using SELinux (e.g., CentOS) may yield additional issues in the form of a 502 Bad Gateway response:


  • 2021-11-03 - 0.5.2 release. Support for wss: protocol when forwarded via HTTPS. Additional documentation to support.
  • 2021-08-10 - 0.5.1 release. Error if sending message > 512MB, as some browsers (notably Chrome) cannot load messages this large.
  • 2021-07-14 - 0.5.0 release. Vue 3.x support.
  • 2021-04-28 - 0.4.0 release. Parallelism for responses on a single web socket. Before, they would block one another, which was annoying for long-running tasks.
  • 2021-02-11 - 0.3.7 release. If neither host nor port is specified, 'localhost' will be used as the host (resulting in a random port being selected).
  • 2021-02-11 - 0.3.6 release. Default bind to IPv4 and IPv6, and documentation update. Some docker containers were having issues as docker now will not translate an IPv6 request to an IPv4 one.
  • 2020-10-07 - 0.3.5 release. Support JSON body in XMLHttpRequest for GET/POST interactions, which is less confusing than encodeURIComponent with a query string.
  • 2020-06-03 - 0.3.4 release. Better support for applications tunneled over a proxy.
  • 2020-06-01 - 0.3.3 release. Larger websocket messages allowed to server by default.
  • 2020-05-28 - 0.3.1 release. Fixes for websockets, mostly documentation, but also page load race condition.
  • 2020-05-27 - 0.2.9 release. Websockets may now receive interactions via HTTP GET/POST requests, to allow child tabs from a Vuespa application to direct the parent tab. This is useful primarily for plugins, which execute code uncontrolled by the core application author, and might execute in an IFrame. Additionally, a config_web_callback method has been added which allows for registering arbitrary HTTP endpoints.
  • 2020-04-02 - 0.2.8 release. Production mode no longer runs 'npm install' if dist folder exists already.
  • 2020-02-04 - 0.2.7 release. Fixed an error from moving to aiohttp websocket. Fixed vue serve hot reloading.
  • 2020-01-06 - 0.2.6 release. A few things:
    • Use IPv4 host by default, since e.g. Docker has issues with IPv6.
    • Only use one port (instead of one for HTTP and a separate port for websocket). This is to make Docker usage easier. Note that for development, the Vue development port will not be forwarded by default.
  • 2019-12-18 - 0.2.5 release built. Better documentation (shows $, and randomly select port unless otherwise specified.
  • 2019-10-21 - 0.2.3 release.

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