Contrib.social

Enable header-based proactive content negotiation with optimizations and opt-outs available.

Open on Drupal.org →
Created on 25 January 2019, over 5 years ago
Updated 10 May 2024, about 1 month ago

Problem/Motivation

In #2445723: Use the $request format instead of the ContentNegotation. → , we removed Accept header negotiation. That's all well and good for the cases where the client, like a browser, accepts multiple formats, making negotiation difficult. However, in the case of an HTTP API (e.g., JSON:API), a client might specify a single format in the Accept header. In such cases, we know enough to set the request format early in the processing, and should do so to both solve for certain edge-case bugs and optimize retrieval from page cache.

By HEAD not currently honoring an unambiguous Accept header, we have the following bug:
- Perform jQuery.ajax('/node/1', {'headers': {'accept': 'application/json'}}). The client is explicitly asking for JSON and only for JSON. /node/1 is not available in JSON, so the correct response is to return a 406. HEAD currently ignores the Accept header and returns a 200, with the body in HTML format.

Additionally, by HEAD not determining the format from an unambiguous Accept header, modules like JSON:API are adding their own middleware to do it. For example, see #3027980: [upstream] Move FormatSetter from middleware to a route filter, removing conditionality on Accept header → . Except, they're doing it wrong, because they're only checking for the presence of the media type in the Accept header, not that it's the only one there.

Proposed resolution

Expand NegotiationMiddleware::getContentType() to return a format that can be unambiguously determined from the Accept header.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet

🐛 Bug report
Status

Needs work

Version

11.0 🔥

Component
Request processing  →

Last updated about 15 hours ago

No maintainer
Created by

🇺🇸United States effulgentsia

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