30:T46f,#### Debugging You can programatically insert breakpoints with the ["debugger"](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/debugger) keyword. Open the DevTools panel (option + command + i for Mac Chrome) and change the handler to the following: ~~~js deploy("info", async (request, response) => { console.log("Request received", request); debugger; // <---- Added line of code ---- response.send( `

\${JSON.stringify({
          request,
          response,
          context: await getContext()
        }, null, 2)}

` ); }) ~~~ Now if you click the link, the next request hangs and you should see the "source" panel open on the debugger statement (sometimes I have to click around Thread to ensure the worker thread is highlighted). Here is what it looks like for me:

From DevTools you can inspect the context of the request, and even respond to the request using the REPL! You should also see a message logged in the console, so if you prefer *console.log* debugging that works too! 31:T528, ### Learn from other implementation Webcode is being used to build an Open Cloud. The [login form](https://observablehq.com/@endpointservices/login-with-comment) is implemented as webcode in a notebook! - An [IndieWeb authentication server](https://observablehq.com/@endpointservices/auth), used to login user using their personal homepages. - A [CORS proxy](https://observablehq.com/@tomlarkworthy/fetchp) service, used to get around those pesky CORS errors. Also can do BASIC AUTH and secret injection. - [Secret Manager](https://observablehq.com/@endpointservices/secrets) is the service used to upload secrets. - A [cloud cron](https://observablehq.com/@endpointservices/cron) service, you can trigger your serverless cells on a schedule. - [Zapier](https://observablehq.com/@endpointservices/zapier) integration, so you can get access to thousands of APIs - [Puppeteer-as-a-service](https://observablehq.com/@endpointservices/puppeteer) for end2end testing (WIP) - [Netlify](https://observablehq.com/@endpointservices/netlify) for deploying static sites using partial deploys. - A [word2vec](https://observablehq.com/@endpointservices/word2vec) service that serves the entire Google word2vec corpus. So you can just peek at the implementation of any of those to see how secure services can be constructed. 32:T5ad,