Issue #2753741 by Wim Leers, dawehner, znerol: Page Cache caches all safe HTTP methods (GET+HEAD), but generates the same cache ID for either: add test coverage to prove this is correct

(cherry picked from commit cae82ac4)

Issue #2664780 by Wim Leers, tedbow, dawehner, klausi: Remove REST's resource- and verb-specific permissions for EntityResource, but provide BC and document why it's necessary for other resources

Revert "Issue #2664780 by Wim Leers, tedbow, dawehner, klausi: Remove REST's resource- and verb-specific permissions for EntityResource, but provide BC and document why it's necessary for other resources"

This reverts commit 85d755a9.

Issue #2664780 by Wim Leers, tedbow, dawehner, klausi: Remove REST's resource- and verb-specific permissions for EntityResource, but provide BC and document why it's necessary for other resources

Issue #2308745 by Alumei, dawehner, Wim Leers, larowlan, Arla, alexpott, g.oechsler, R.Muilwijk, Berdir, catch, klausi, clemens.tolboom, MattA, Crell: Remove rest.settings.yml, use rest_resource config entities

Issue #2699613 by alexpott, catch, Wim Leers, Berdir, dawehner, mpdonadio, borisson_, Fabianx: Set a shorter TTL for 404 responses in page_cache module

Issue #2572777 by andypost, alexpott, attiks, andriyun: Fix 'Squiz.Strings.ConcatenationSpacing' coding standard

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2619332 by joelpittet, jmarkel, Wim Leers, Berdir, chintan.vyas, netsensei: Color scheme config changes aren't reflected in cached pages

Issue #2527126 by Wim Leers, dawehner, effulgentsia, anavarre, janusman, Fabianx, alexpott, hass, catch, Berdir, znerol: Only send X-Drupal-Cache-Tags and -Contexts headers when developer explicitly enables them

Issue #2476407 by borisson_, hussainweb, znerol, Fabianx, Wim Leers, dawehner, Crell, Berdir: Use CacheableResponseInterface to determine which responses should be cached

Issue #2503755 by Wim Leers, bobrov1989, webchick, dcrocks, andypost, emma.maria, catch, Bojhan, dawehner, Gábor Hojtsy, alexpott, tstoeckler, yoroy: Switch from user login block to login menu link and search block in standard profile

Revert "Issue #2503755 by Wim Leers, bobrov1989, webchick, dcrocks, andypost, emma.maria, catch, dawehner, Bojhan, tstoeckler, alexpott, yoroy: Switch from user login block to login menu link and search block in standard profile"

This reverts commit 1cdbe865.

Issue #2503755 by Wim Leers, bobrov1989, webchick, dcrocks, andypost, emma.maria, catch, dawehner, Bojhan, tstoeckler, alexpott, yoroy: Switch from user login block to login menu link and search block in standard profile

Issue #2476947 by mdrummond, Wim Leers, davidhernandez, lauriii, joelpittet, andypost, Cottser, JeroenT, Manuel Garcia, rpayanm: Convert "title" page element into a block

Issue #2560783 by stefan.r, joelpittet, lauriii, Cottser, Sutharsan, kgoel, justAChris, Gábor Hojtsy, dawehner, jhodgdon, effulgentsia, xjm, andypost, googletorp: Replace !placeholder with :placeholder for URLs in hook_help() implementations

Issue #2543334 by Wim Leers, lauriii, Fabianx: Auto-placeholdering for #lazy_builder with bubbling of contexts and tags

Issue #2511516 by lauriii, Xano, Wim Leers, dawehner: Make local tasks and actions hooks provide cacheability metadata, to make the blocks showing them cacheable

Issue #2005546 by mdrummond, joelpittet, Manuel Garcia, lauriii, lokapujya, epari.siva, hosef, rpayanm, emma.maria, HOG, zetagraph, wmortada, rteijeiro, Cottser, hussainweb, madhavvyas: Use branding block in place of page template branding variables (site name, slogan, site logo)

Issue #2429617 by Wim Leers, Fabianx, Berdir, yched, dawehner, effulgentsia, catch, borisson_, jhodgdon, martin107, torgosPizza: Make D8 2x as fast: Dynamic Page Cache: context-dependent page caching (for *all* users!)

Issue #507488 by lauriii, mdrummond, Wim Leers, Manuel Garcia, pwolanin, davidhernandez, chx, jibran, andypost, dawehner, Xano, tuutti, Gábor Hojtsy, LewisNyman, maximiliam, eiriksm, borisson_, bill richardson, Fabianx, joelpittet, Jeff Burnz, xjm, webchick, Bojhan, EclipseGc, emma.maria, tim.plunkett: Convert page elements (local tasks, actions) into blocks

Issue #2351015 by plach, effulgentsia, Wim Leers, dawehner, martin107, damiankloip, cilefen, Fabianx, catch, pwolanin, Damien Tournoud, znerol, YesCT, larowlan: URL generation does not bubble cache contexts

Issue #2493033 by Berdir, Wim Leers, lauriii, Fabianx, effulgentsia, dawehner, catch, msonnabaum, Crell, webchick: Make 'user.permissions' a required cache context

Issue #2421503 by lauriii, larowlan, Wim Leers, dawehner, tim.plunkett: SA-CORE-2014-002 forward port only checks internal cache

Issue #2375695 by Berdir, EclipseGc, tim.plunkett, Wim Leers, Fabianx, dawehner: Condition plugins should provide cache contexts AND cacheability metadata needs to be exposed

Issue #2509300 by dawehner, catch, larowlan: Path alias UI allows node/1 and /node/1 as system path then fatals

Issue #2481453 by dawehner, pwolanin, rteijeiro, neclimdul, znerol: Implement query parameter based content negotiation as alternative to extensions

Issue #2473729 by FMB, darol100, ifrik, ivarlaks, jhodgdon: Review the hook_help for Internal page cache module

Issue #1805054 by Wim Leers, Gábor Hojtsy, effulgentsia, jibran, jessebeach, catch, dawehner, Fabianx, sun, larowlan: Cache localized, access filtered, URL resolved, and rendered menu trees

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2473113 by znerol, dpovshed, Wim Leers, Fabianx, dawehner, effulgentsia: All stack middlewares are constructed at the same time even for cached pages