Fix for Next.js / React SSR meta tags have URL-encoded content

fix.js

// React SSR renders out <meta tags with URL-encoded values. 
// That's bad if you need query parameters in your URLs.
// Before: <meta property="og:image" 
// content="https://makelight-prismic-images.imgix.net/7f97d951970bbb15a8b3744e4c69499ffe969d66_img_1010.jpg?w=1200&amp;h=630&amp;fit=crop&amp;crop=entropy&amp;auto=format&amp;ixlib=js-1.1.1" class="next-head"/>
// (Notice the &amp;s in the URL)
//
// After: <meta property="og:image" 
// content="https://makelight-prismic-images.imgix.net/cfb3a074bfcab5793eded64ef077dd6260d6d89b_img_0578.jpg?w=1200&h=630&fit=crop&crop=entropy&auto=format&ixlib=js-1.1.1" class="next-head"/>
// (Notice &amp; is now correctly &
//
// Use a custom Express server and add this middleware at the top of the middleware stack

const interceptor = require('express-interceptor');
const Entities = require('html-entities').AllHtmlEntities;
const entities = new Entities()

const metaContentFixer = interceptor(function(req, res){
  //console.log(res)
  return {
    isInterceptable: function (rq, rs) {
      // Only alter HTML
      //console.log('is interceptable',res.get('Content-Type'))
      return /text\/html/.test(res.get('Content-Type'));
    },
    intercept: function (body, send) {
      // Regex matches anything with a content="" attribute. Adjust this for your own needs.
      send(body.toString().replace(/content="([^"]+)"/g, function(match, content) {
        console.log('replace', content)    
        return `content="${entities.decode(content)}"`    
      }))
    }
  }
})

const server = express()

server.use(metaContentFixer)

... the rest of your Express setup.