Use constant development build id

Author: kpdecker

server/index.js

@@ -408,7 +408,11 @@ export default class Server {
   }
 
   handleBuildId (buildId, res) {
-    if (this.dev) return true
+    if (this.dev) {
+      res.setHeader('Cache-Control', 'no-store, must-revalidate')
+      return true
+    }
+
     if (buildId !== this.renderOpts.buildId) {
       return false
     }
@@ -428,13 +432,17 @@ export default class Server {
   }
 
   handleBuildHash (filename, hash, res) {
-    if (this.dev) return
+    if (this.dev) {
+      res.setHeader('Cache-Control', 'no-store, must-revalidate')
+      return true
+    }
 
     if (hash !== this.buildStats[filename].hash) {
       throw new Error(`Invalid Build File Hash(${hash}) for chunk: ${filename}`)
     }
 
     res.setHeader('Cache-Control', 'max-age=365000000, immutable')
+    return true
   }
 
   send404 (res) {

server/render.js

@@ -93,11 +93,6 @@ async function doRender (req, res, pathname, query, {
   }
 
   const docProps = await loadGetInitialProps(Document, { ...ctx, renderPage })
-  // While developing, we should not cache any assets.
-  // So, we use a different buildId for each page load.
-  // With that we can ensure, we have unique URL for assets per every page load.
-  // So, it'll prevent issues like this: https://git.io/vHLtb
-  const devBuildId = Date.now()
 
   if (res.finished) return
 
@@ -107,7 +102,7 @@ async function doRender (req, res, pathname, query, {
       props,
       pathname,
       query,
-      buildId: dev ? devBuildId : buildId,
+      buildId,
       buildStats,
       assetPrefix,
       nextExport,