The Now CDN does not support the `stale-if-error` header and already behaves like that for `stale-while-revalidate`.

Removing this header allows Now CDN to use its default headers instead of sending _only_ `stale-if-error` after stripping `s-maxage` and `stale-while-revalidate`.

* Add revalidate header and error when invalid
object from getStaticProps

* Make sprCache no-op in dev mode

* Update packages/next/next-server/server/next-server.ts

* Update tests for fixes

* Update getStaticProps error and add test

* Update manifest test

* Add validating revalidate value

* Apply suggestions from code review
Co-Authored-By: NJoe Haddad <joe.haddad@zeit.co>

* Change from error to warning high revalidate value

* Add find-pages-dir

* Add support for src directory

* Add test for pages dir preference

* Update comment

* initial commit for SPRv2

* Add initial SPR cache handling

* update SPR handling

* Implement SPR handling in render

* Update tests, handle caching with serverless next
start, add TODOs, and update manifest generating

* Handle no prerender-manifest from not being used

* Fix url.parse error

* Apply suggestions from code review
Co-Authored-By: NJoe Haddad <joe.haddad@zeit.co>

* Replace set with constants in next-page-config

* simplify sprStatus.used

* Add error if getStaticProps is used with getInitialProps

* Remove stale TODO

* Update revalidate values in SPR cache for non-seeded routes

* Apply suggestions from code review

* Remove concurrency type

* Rename variable for clarity

* Add copying prerender files during export

* Add comment for clarity

* Fix exporting

* Update comment

* Add additional note

* Rename variable

* Update to not re-export SPR pages from build

* Hard navigate when fetching data fails

* Remove default extension

* Add brackets

* Add checking output files to prerender tests

* Adjust export move logic

* Clarify behavior of export aggregation

* Update variable names for clarity

* Update tests

* Add comment

* s/an oxymoron/contradictory/

* rename

* Extract error case

* Add tests for exporting SPR pages and update
/_next/data endpoint to end with .json

* Relocate variable

* Adjust route building

* Rename to unstable

* Rename unstable_getStaticParams

* Fix linting

* Only add this when a data request

* Update prerender data tests

* s/isServerless/isLikeServerless/

* Don't rely on query for `next start` in serverless mode

* Rename var

* Update renderedDuringBuild check

* Add test for dynamic param with bracket

* Fix serverless next start handling

* remove todo

* Adjust comment

* Update calculateRevalidate

* Remove cache logic from render.tsx

* Remove extra imports

* Move SPR cache logic to next-server

* Remove old isDynamic prop

* Add calling App getInitialProps for SPR pages

* Update revalidate logic

* Add isStale to SprCacheValue

* Update headers for SPR

* add awaiting pendingRevalidation

* Dont return null for revalidation render

* Adjust logic

* Be sure to remove coalesced render

* Fix data for serverless

* Create a method coalescing utility

* Remove TODO

* Extract send payload helper

* Wrap in-line

* Move around some code

* Add tests for de-duping and revalidating

* Update prerender manifest test

* Global CSS Support

* Fix webpack configuration

* oneOf rule isn't necessary yet

* Adjust CSS chunk naming

* Begin testing CSS behavior

* Add another test TODO

* Replace null-loader with ignore-loader

* Turn on chunks for new CSS feature

* Fix multi test suite

* Test CSS import order

* Test style HMR

* Test CSS compilation

* Test compilation and prefixing together

* Verify CSS styling works for Development and Production

* Add missing TODO

* Remove unnecessary test

* Adjust TODO message

* Hide page until React hydrates

* Revert "Hide page until React hydrates"

This reverts commit 898d4e0ee547b003d5790e2b11476740d645b907.

* Hide FOUC during development

* Test CSS imports

* Update tests TODO

* Add fixture for url() test

* Test `file-loader` support in CSS files

* Use a simple variant of cssnano

* Self-import

* Undo bundling

* Implement suggestion

* Initial move

* Make emitting work

* Update paths

* Remove leftover files

* Add correct externals configuration

* Import correct path

* Update path to work with ts-server test

* Update lib directory

* Compile next-server/lib

* Revert 405 on pages

* Modify tests

* Experimental: Serverless Trace target
The Serverless Trace target produces Serverless-handler wrapped entrypoints, but does not bundle all of `node_modules`.

This behavior increases bundling performance to be more akin to `target: 'server'`.

This mode is expected to be used with smart platforms (like [ZEIT Now](https://zeit.co/now) that can trace a program to its minimum dependencies.

* Use more generic variables

* Add asset relocator for production mode of serverless trace

* Verify Firebase compatiblity

* Revert "Add asset relocator for production mode of serverless trace"

This reverts commit 8404f1dcf28b60edab41a56c94b38dcd3fddec20.

* Add serverless trace tests

* Add _isLikeServerless helper

* Make constants

* Fix export

* Update packages/next-server/server/config.ts
Co-Authored-By: NJJ Kasper <jj@jjsweb.site>

* Use a global helper for is like serverless

* Update import for isTargetLikeServerless

* Update packages/next/build/index.ts
Co-Authored-By: NJJ Kasper <jj@jjsweb.site>

* Add `compress` option to enable gzip compression in `next start`.

* Add compress option, defaulting to true

* Disable compression for serverless target

* Pin compression dep
Co-Authored-By: NJoe Haddad <timer150@gmail.com>

* Pin compression types
Co-Authored-By: NJoe Haddad <timer150@gmail.com>

* lockfile update for locked compression deps

* simplify compression middleware application

* add test for compression

* Avoid sending user error to client Closes #7526

* Small improvments

* Update sending errors

* Add support for Precondition Failed status for static files

* Add test

* Trigger tests

* Update next-server.ts

* Add default values for runtime config

* Add test to ensure default values are set
for runtime config

* Only add runtimeConfig if it's not empty

* Only add runtimeConfig if it's not empty

* Simplify default value adding

* Reduce bundle size

* remove comment changes

* Fix typos

* Add test for runtimeConfig in __NEXT_DATA__

* Add failing API tests to serverless

* Add newline

* Fix failing serverless tests

* Experimentalize `public/`

* Update tests for publicDirectory config

* Fix serverless loader for API routes

* Only use params with dynamic routes

* Change static method handling and pages revert

* Allow and reflect old behaviour

* Post should return 501

* Add back old test

* Invert logic

* Handle 501 for pages in separate location

* Remove usage of 501 HTTP status code

* Prevent information leak

* Add test

* Only 405 if the page exists -- 404 if it doesn't

* Handle sent responses

* Revert "Handle sent responses"

This reverts commit 5e9012ae29b611c25ed1e090756a25dbe3437182.

* Fix bad test

* Switch back to quiet

* Update test/integration/production/test/index.test.js
Co-Authored-By: NJJ Kasper <jj@jjsweb.site>

* Add prerender PageConfig option

* Update PageConfig type

* Add inlining of data when pre-render is set and add tests

* Update types import

* Add check for props

* Rename prerender to experimentalPrerender for now

* Unflag Dynamic Routing

* Unflag Automatic Prerendering

* Ensure pages are lambdas for test

* Fix file check

* Fix tests

* oof

* Use lambda for document middleware test

* Update helper function to invoke only on get

* Tests for body parsing

* Update api-utils.ts

* Update next-server.ts

* Update packages/next-server/server/next-server.ts
Co-Authored-By: NJJ Kasper <jj@jjsweb.site>

* Dynamic routes for API

* New structure

* Change next config

* Refactoring tests

* Fix newline

* Fix tests

* Remove dynamic from config

* Apply suggestions from code review
Co-Authored-By: NJoe Haddad <timer150@gmail.com>

* Update index.test.js

* `_document` middleware is experimental

Closes https://github.com/zeit/next.js/issues/7580

* Turn on document middleware

* Adding Typescript description to next fixes #7529

* Change default export

* Improve typing for next

* Remove dev server typings

* Fix next start in serverless mode with public directory

* Add public folder to serverless test suite

* Add export const config support and make withAmp a no-op

* Use babel plugin for PageConfig

* Fix serverless-loader exports

* Add backwards compatibility for withAmp

* Cookies and Query parsing for API request

* Adding JSON and SEND

* First body parsing

* Body parsing

* Remove extra try catch

* Fix tests

* Only server bundling for API routes

* Update packages/next-server/server/api-utils.ts
Co-Authored-By: NTim Neutkens <tim@timneutkens.nl>

* Revert on demand server changes

* Use content-type for parsing

* Update packages/next-server/server/api-utils.ts
Co-Authored-By: NJan Potoms <potoms.jan@gmail.com>

* Add tests for server compilation

* Add body limit

* Change API to function chaining

* Limit test

* Revise dynamic route generation
This implements a new tree-based route sorting algorithm that uses a Depth-First-Traversal approach to correctly sort the routes.

This provides better clarity over a `.sort()` based approach and will scale well as we add new features in the future.

* Update import

* Run prettier over packages/**/*.js

* Run prettier over packages/**/*.ts

* Run prettier over examples

* Remove tslint

* Run prettier over examples

* Run prettier over all markdown files

* Run prettier over json files

* Add canonicalBase config to allow setting
absolute path for canonical link

* Make sure canonicalBase is set for
export and serverless

* Move canonicalBase to amp.canonicalBase

* Update tests with canonicalBase config

* Update tests

* run lint-fix

* Fix canonicalBase config parsing

* Fix canonicalBase during export

* Update amphtml tests

* Update escape string regexp operators

* temp

* Extract getRouteRegex func

* First iteration of dynamic routing for production only

* Correctly order prod

* Add serverless support

* Single line it

* noop routes

* Format doc

* Fix dynamic routing for dev

* Add flag for dynamic routing

* Update packages/next-server/lib/router/router.ts
Co-Authored-By: NJJ Kasper <jj@jjsweb.site>

* remove example

* Add router tests

* Format code

* Sort routes

* Update to not use posix path methods

* Format next server

* Extract findPageComponents logic from renderToHTMLWithComponents

* Apply a little formatting

* Lift up component loading

* Add automatic exporting of pages with no getInitialProps

* Add support for exporting serverless to static
and serving the html files during next start

* Fix missing runtimeEnv when requiring page, re-add warning
when trying to export with serverless, and update tests

* Update flying-shuttle test

* revert un-used pagesManifest change

* remove query.amp RegExp test

* Fix windows backslashes not being replaced

* Re-enable serverless support for next start

* bump

* Fix getInitialProps check

* Fix incorrect error check

* Re-add check for reserved pages

* Fix static check

* Update to ignore /api pages and clean up some tests

* Re-add needed next.config for test and correct behavior

* Update RegExp for ignored pages for auto-static

* Add checking for custom getInitialProps in pages/_app

* Update isPageStatic logic to only use default export

* Re-add retrying to CircleCi

* Update query during dev to only have values
available during export for static pages

* Fix test

* Add warning when page without default export is
found and make sure to update pages-manifest
correctly in flying-shuttle mode

* Fix backslashes not being replaced

* Integrate auto-static with flying-shuttle
and make sure AMP is handled in flying-shuttle

* Add autoExport for opting in