Revert "Issue #1927648 by damiankloip, Wim Leers, marthinal, tedbow, Arla, alexpott, juampynr, garphy, bc, ibustos, eiriksm, larowlan, dawehner, gcardinal, vivekvpandya, kylebrowning, Sam152, neclimdul, pnagornyak, drnikki, gaurav.goyal, queenvictoria, kim.pepper, Berdir, clemens.tolboom, blainelang, moshe weitzman, linclark, webchick, Dave Reid, dabito, skyredwang, klausi, dagmar, gabesullice, pwolanin, amateescu, slashrsm, andypost, catch, aheimlich: Allow creation of file entities from binary data via REST requests"

This reverts commit fd8233c7.

Issue #1927648 by damiankloip, Wim Leers, marthinal, tedbow, Arla, alexpott, juampynr, garphy, bc, ibustos, eiriksm, larowlan, dawehner, gcardinal, vivekvpandya, kylebrowning, Sam152, neclimdul, pnagornyak, drnikki, gaurav.goyal, queenvictoria, kim.pepper, Berdir, clemens.tolboom, blainelang, moshe weitzman, linclark, webchick, Dave Reid, dabito, skyredwang, klausi, dagmar, gabesullice, pwolanin, amateescu, slashrsm, andypost, catch, aheimlich: Allow creation of file entities from binary data via REST requests

Issue #2942522 by Wim Leers: Follow-up for #2543726: remove work-around in POST test coverage for bug in Term entity type that has been fixed

Issue #2939802 by Wim Leers, cburschka: Follow-up for #2824851: EntityResourceTestBase::getModifiedEntityForPatchTesting() handles @FieldType=path incorrectly

Issue #2936704 by Wim Leers, amateescu, alexpott, Berdir: Remove REST route deprecations from DeprecationListenerTrait::getSkippedDeprecations(), use ExpectDeprecationTrait::expectDeprecation() instead

Issue #2935076 by amateescu: EntityResourceTestBase::getNormalizedPostEntity() wrongly assumes that all entity types have auto-generated sequential IDs

Issue #2858482 by Wim Leers, dawehner, benjy, larowlan, tedbow, borisson_: Simplify REST routing: disallow requesting POST/PATCH in any format, make consistent

Issue #2885469 by Wim Leers, amateescu, timmillwood, alexpott, tstoeckler, xjm, remram, Berdir, dawehner, larowlan, samuel.mortenson: Regression: manually setting the ID field for newly-created content entities is not possible anymore (public follow-up to SA-2017-002)

Issue #2824851 by Wim Leers, arshadcn, amateescu, effulgentsia, tedbow, timmillwood, cburschka, tstoeckler, Berdir, xjm, catch: EntityResource::patch() makes an incorrect assumption about entity keys, hence results in incorrect behavior

Issue #2825487 by damiankloip, Wim Leers, garphy, cburschka, tedbow, dpovshed, tstoeckler, Munavijayalakshmi, Berdir, dawehner, e0ipso: Fix normalization of File entities: file entities should expose the file URL as a computed property on the 'uri' base field

Issue #2928702 by Wim Leers, borisson_, tedbow: Make EntityResourceTestBase's field_rest_test_multivalue test field less invasive: omit it from normalizations

Issue #2765959 by davidwbarratt, Wim Leers, dawehner, borisson_, tstoeckler, tedbow, catch: Make 4xx REST responses cacheable by (Dynamic) Page Cache + comprehensive cacheability test coverage

Issue #2905686 by Wim Leers: Expand EntityResourceTestBase to test PATCHing multi-value fields: both adding and removing items

Issue #2800873 by Wim Leers, lhangea, damiankloip, Yogesh Pawar, dawehner, alexpott: Add XML GET REST test coverage, work around XML encoder quirks

Issue #2901562 by mfernea, Jo Fitzgerald, Yogesh Pawar, 3ssom, Mile23, borisson_: Fix 'Squiz.WhiteSpace.SuperfluousWhitespace' coding standard

Issue #2870194 by alexpott, Mile23, jibran, larowlan, tim.plunkett: Ensure that process-isolated tests can use Symfony's PHPunit bridge to catch usages of deprecated code

Issue #2920001 by Wim Leers, dawehner, borisson_, aheimlich, davidwbarratt: Add cacheable HTTP exceptions: Symfony HTTP exceptions + Drupal cacheability metadata

Issue #2874938 by Wim Leers, tim.plunkett, borisson_, effulgentsia: AdminRouteSubscriber must only mark HTML routes as administrative

Issue #2843755 by Wim Leers, larowlan, andypost, jibran, Berdir: EntityResource: Provide comprehensive test coverage for Message entity

Issue #2843778 by Wim Leers: EntityResource: Provide comprehensive test coverage for ContactForm entity

Revert "Issue #2824851 by Wim Leers, arshadcn, amateescu, tedbow, timmillwood, Berdir, tstoeckler: EntityResource::patch() makes an incorrect assumption about entity keys, hence results in incorrect behavior"

This reverts commit 3b3daa35.

Issue #2824851 by Wim Leers, arshadcn, amateescu, tedbow, timmillwood, Berdir, tstoeckler: EntityResource::patch() makes an incorrect assumption about entity keys, hence results in incorrect behavior

Issue #2882717 by Wim Leers, dawehner: EntityResourceTestBase: assert that PATCHed and POSTed entities contain the intended values

Issue #2869387 by tstoeckler, Wim Leers: Subclasses of ResourceTestBase for non-entity resources are required to add pointless code

Issue #2768651 by damiankloip, Wim Leers, mpdonadio, Munavijayalakshmi, Jo Fitzgerald, jhedstrom: Let TimestampItem (de)normalize to/from RFC3339 timestamps, not UNIX timestamps, for better DX

Issue #2293697 by Wim Leers, dawehner, Jo Fitzgerald, clemens.tolboom, vedpareek, tedbow, Munavijayalakshmi, hchonov, alexpott, effulgentsia, tstoeckler, Crell, klausi, EclipseGc: EntityResource POST routes all use the confusing default: use entity types' https://www.drupal.org/link-relations/create link template if available

Issue #2869415 by Wim Leers, tstoeckler, dawehner: EntityResourceTestBase::getUrl() overrides BrowserTestBase::getUrl(), yet offers different functionality

Issue #2827797 by Wim Leers, dawehner, effulgentsia, tedbow: ResourceResponse(Subscriber) + Dynamic Page Cache: making authenticated ResourceResponses significantly faster

Issue #2843754 by rogierbom, Wim Leers, gaurav.kapoor, vaplas: EntityResource: Provide comprehensive test coverage for Feed entity

Issue #2825973 by amateescu, timmillwood, himanshu-dixit, dawehner, Berdir, Wim Leers: Introduce a EditorialContentEntityBase class for revisionable and publishable entity types

Issue #2848927 by Wim Leers, alexpott: EntityResource::addLinkHeaders() should use LinkRelationType plugin instances rather than definitions

Issue #2826407 by Wim Leers, dawehner, Jo Fitzgerald: PATCH + POST allowed format validation happens in RequestHandler::handle(), rather than in the routing system

Issue #2843752 by arshadcn, Wim Leers: EntityResource: Provide comprehensive test coverage for Item entity

Issue #2853211 by vaplas, Wim Leers, arshadcn: EntityResource::post() incorrectly assumes that every entity type has a canonical URL

Issue #2817745 by Wim Leers: Add test coverage to prove that REST resource's "auth" configuration is also not allowing global authentication providers like "cookie" when not listed

Issue #2832859 by vaplas, webflo, harings_rob, Wim Leers: Write EntityResourceTestBase subclasses for: MenuLinkContent

Issue #2844046 by Wim Leers, dawehner, tedbow: REST Resource config entities do not respect the status (enabled/disabled)