[Bug] contexts.delete() fails with 400 — same Content-Type issue as extensions.delete() (#169)

Start in core.ts and core.mjs at the defaultHeaders logic shown in the issue, then compare it with the contexts.delete() request and the related extensions.delete() bug. Done means a bodyless DELETE no longer receives the JSON Content-Type header and contexts.delete() completes successfully with HTTP 204 or 200.

Describe the bug

bb.contexts.delete(id) fails with:

400 Body cannot be empty when content-type is set to 'application/json'

This is the same root cause as #169 (extensions.delete()). The SDK's defaultHeaders in core.ts sets Content-Type: application/json on all non-GET/HEAD methods, including DELETE — which sends no request body.

// core.mjs:140
...(['head', 'get'].includes(opts.method) ? {} : { 'Content-Type': 'application/json' }),

DELETE should be excluded here alongside get and head.

Steps to reproduce

import Browserbase from "@browserbasehq/sdk";

const bb = new Browserbase({ apiKey: process.env.BROWSERBASE_API_KEY });

// Create a context
const ctx = await bb.contexts.create({
  projectId: process.env.BROWSERBASE_PROJECT_ID,
});

// Try to delete it — fails
await bb.contexts.delete(ctx.id);

Expected behavior

Context is deleted successfully (HTTP 204 or 200).

Actual behavior

Throws BadRequestError: 400 Body cannot be empty when content-type is set to 'application/json'.

Attempting to override the header with { headers: { 'Content-Type': '' } } results in a different error: 415 Unsupported Media Type.

Workaround

Use a direct HTTP call (e.g., axios or fetch) that doesn't set Content-Type on bodyless DELETE:

import axios from "axios";

await axios.delete(
  `https://api.browserbase.com/v1/contexts/${ctx.id}`,
  { headers: { "x-bb-api-key": process.env.BROWSERBASE_API_KEY } },
);

Suggested fix

In core.ts / core.mjs, exclude delete from the Content-Type default:

...(['head', 'get', 'delete'].includes(opts.method) ? {} : { 'Content-Type': 'application/json' }),

Environment

• @browserbasehq/sdk: latest (installed 2026-03-15)
• Node.js: v22.21.1
• OS: macOS (Darwin 25.2.0)