Documentation mismatch: HttpTransporter constructor requires 5 arguments in v2.6.0, but README shows only 3

[ahilespelid]

Describe the issue

In version 2.6.0 the constructor of Gemini\Transporters\HttpTransporter actually requires 5 arguments, but:

• The README.md shows only 3 arguments:

  $transporter = new HttpTransporter($guzzle, $apiKey, $headers);

The source code in 2.6.0 clearly shows 5 parameters:PHP

public function __construct(
    ClientInterface $client,
    string $baseUri,
    string $apiKey,
    array $headers = [],
    ?Closure $streamHandler = null
)

Especially confusing:

The 5th argument is a Closure (?Closure $streamHandler = null), which is not mentioned anywhere in the documentation or examples.
Passing only 3 arguments results in ArgumentCountError: Too few arguments ... exactly 5 expected.
There is no mention of $streamHandler being a Closure in README, examples, or changelog.

Expected behavior
Documentation (README, examples) should match the actual constructor signature for the tagged version (2.6.0).
Either:

Update README to show correct 5-argument call (with optional Closure)
Or explain that Closure is optional and can be null
Or add a convenience factory method like in later versions

Actual behavior
Users following README get fatal error on constructor call.
Environment

Package version: 2.6.0 (composer show google-gemini-php/client)
PHP: 8.1+
Relevant code: new HttpTransporter($guzzle, $apiKey, [])

Suggested fix

Add note in README:Note: in v2.6.0 HttpTransporter requires 5 arguments. The 5th is optional Closure for stream handling (can be null).
Example:PHP$transporter = new HttpTransporter($guzzle, 'https://generativelanguage.googleapis.com/v1beta/', $apiKey, [], null);
Or backport Client::make() from 2.7+ to simplify creation.

Thanks for the great package — just a documentation gap that trips people up when pinning to 2.6.0.

The working version

$transporter = new HttpTransporter(
    $guzzle,                                      	   // 1. ClientInterface
    'https://generativelanguage.googleapis.com/v1beta/', // 2. baseUri (строка)
    $api_key,                                     	   // 3. apiKey (строка)
    [],                                           	   // 4. headers (массив)
    null                                          	   // 5. streamHandler (Closure или null)
);

[Plytas]

@ahilespelid can you point us to where in documentation transporter is mentioned?

[ahilespelid]

Created partition HttpTransporter for version 2.6.0 or 2.7.0 in yor README.MD

[Plytas]

@ahilespelid this is the README as it was in version 2.6.0 https://raw.githubusercontent.com/google-gemini-php/client/refs/tags/2.6.0/README.md

There's no mention of transporter.