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# Phase 04 — Simplify Headers.build
**Estimated time:** ~15 minutes
**Touches:** `lib/dispatch/adapter/minimax/headers.rb`,
`lib/dispatch/adapter/minimax.rb` (callsite cleanup).
## Goal
Collapse `Headers.build` from the Anthropic Claude Code header set
(Stainless SDK fingerprints, `anthropic-version`, `anthropic-beta` list,
Claude Code UA, OAuth-vs-API-key branching, `claude_code_only` mode) to
the bare minimum MiniMax accepts:
- `Authorization: Bearer <api_key>`
- `Content-Type: application/json`
- `Accept: application/json` (or `text/event-stream` when `stream: true`)
That's it. No version header, no betas, no Stainless metadata, no UA.
## Steps
### 1. Rewrite `lib/dispatch/adapter/minimax/headers.rb` end to end
```ruby
# frozen_string_literal: true
module Dispatch
module Adapter
class MiniMax < Base
module Headers
module_function
# Build the request headers for a MiniMax API call.
#
# @param api_key [String] the MiniMax API key (Token Plan or PAYG)
# @param stream [Boolean] set Accept to text/event-stream when true
# @param extra [Hash] low-priority caller overrides
# @return [Hash<String,String>]
def build(api_key:, stream: false, extra: {})
headers = extra.transform_keys(&:to_s)
headers["Content-Type"] = "application/json"
headers["Accept"] = stream ? "text/event-stream" : "application/json"
# Authorization is always last so caller extras cannot override it.
headers["Authorization"] = "Bearer #{api_key}"
headers
end
end
end
end
end
```
### 2. Update every callsite in `lib/dispatch/adapter/minimax.rb`
Find every `Headers.build(...)` and `build_headers_proc` invocation. The
old signature took these keywords:
```
api_key:, is_oauth:, stream:, extra_betas:, interleaved_thinking:,
base_url:, extra:, claude_code_only:
```
Replace EACH callsite with the new signature, keeping only:
```
api_key:, stream:, extra: (only when actually passed)
```
DELETE every passing of:
- `is_oauth:`
- `extra_betas:`
- `interleaved_thinking:`
- `base_url:` (Headers no longer cares about it)
- `claude_code_only:`
### 3. Drop `extra_betas` from the constructor
Phase 02 may have left `@extra_betas` ivar in place. Now delete:
- The `extra_betas:` keyword on `initialize`.
- The `@extra_betas = Array(extra_betas)` assignment.
- Any reference in `chat`, `count_tokens`, `list_models`, etc.
### 4. Drop the `build_headers_proc` lambda if it exists
If `lib/dispatch/adapter/minimax.rb` still has a `build_headers_proc`
method or lambda factory, delete it. Replace its call sites with direct
`Headers.build(api_key: @api_key, stream: ...)` calls. The wrapper was
needed because `claude_code_only` and `extra_betas` varied per request;
they no longer exist.
## Acceptance criteria
- `headers.rb` is approximately the size shown above (≤ 25 lines of code).
- `grep -rn 'anthropic-version\|anthropic-beta\|x-stainless\|claude-cli\|claude_code_only\|interleaved_thinking\|extra_betas\|DEFAULT_BETAS\|CLAUDE_CODE_VERSION\|STAINLESS_PACKAGE_VERSION\|sk-ant-oat' lib/` returns ZERO matches.
- The constructor no longer accepts `extra_betas:`.
- Every `Headers.build` callsite in `lib/dispatch/adapter/minimax.rb` uses
only `api_key:`, `stream:`, and optionally `extra:` keywords.
- `bundle exec rubocop --autocorrect-all` exits 0.
The headers spec will fail until phase 13 retargets it; that is expected.
## Verification
Run `run_tests` with `project_path=reference/dispatch-adapter-minimax`.
Rubocop must be clean. RSpec failures in `headers_spec.rb` are acceptable
(retargeted in phase 13). RSpec failures elsewhere caused by missing
header keywords are NOT acceptable — chase them down and fix the call
chain before calling `ask_for_next_plan`.
|
