feat(ok_http): add user-agent

[denysvitali]

• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

---

This adds an userAgent configuration field as with other HTTP libraries. This allows more flexibility in migrating from dart:io's HTTP to OkHttp.

[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
ok_http	Non-Breaking	0.1.0	0.1.1-wip	0.1.1	✔️

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Changelog Entry ❗

Package	Changed Files
package:ok_http	pkgs/ok_http/lib/src/ok_http_client.dart

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Coverage ⚠️

File	Coverage
pkgs/ok_http/lib/src/ok_http_client.dart	💔 Not covered

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API leaks ⚠️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbol	Leaking sources
ok_http	$Certificate$NullableType	jni/bindings.dart::Certificate::nullableType
ok_http	$Certificate$Type	jni/bindings.dart::Certificate::type
ok_http	PublicKey	jni/bindings.dart::Certificate::verify::publicKey jni/bindings.dart::$PublicKey$NullableType jni/bindings.dart::$PublicKey$NullableType::nullableType jni/bindings.dart::$PublicKey$Type jni/bindings.dart::$PublicKey$Type::nullableType jni/bindings.dart::Certificate::verify$1::publicKey jni/bindings.dart::Certificate::verify$2::publicKey jni/bindings.dart::Certificate::getPublicKey jni/bindings.dart::X509Certificate::verify2::publicKey
ok_http	$PublicKey$NullableType	jni/bindings.dart::PublicKey::nullableType
ok_http	$PublicKey$Type	jni/bindings.dart::PublicKey::type
ok_http	$PublicKey	jni/bindings.dart::PublicKey::implementIn::$impl jni/bindings.dart::PublicKey::implement::$impl
ok_http	$X509Certificate$NullableType	jni/bindings.dart::X509Certificate::nullableType
ok_http	$X509Certificate$Type	jni/bindings.dart::X509Certificate::type
ok_http	$PrivateKey$NullableType	jni/bindings.dart::PrivateKey::nullableType
ok_http	$PrivateKey$Type	jni/bindings.dart::PrivateKey::type
ok_http	$PrivateKey	jni/bindings.dart::PrivateKey::implementIn::$impl jni/bindings.dart::PrivateKey::implement::$impl

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License Headers ✔️

// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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no missing headers

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Files
pkgs/http/example/main.dart

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[brianquinlan]

Could you add a test here: https://github.com/dart-lang/http/blob/master/pkgs/ok_http/example/integration_test/client_configuration_test.dart

[brianquinlan]

Could you add dart doc for this?