[rb] implement client config class

[titusfortner]

User description

🔗 Related Issues

Addresses Ruby portion of #16269

💥 What does this PR do?

• Creates config class for customizing everything currently customizable about Default http client
• Allows passing in the client_config into the driver constructors which passes it to the Bridge constructor
• Bridge Constructor has to manage all the ways the parameters can be in conflict

🔧 Implementation Notes

Went with a Data instance based on its goal of immutability. I overrode the constructor so that it only allows keywords and they are all optional
PORO seemed overkill and Struct is too loose

💡 Additional Considerations

1. My first thought was that we would be deprecating the existing http_client approach, but that only makes sense if net-http can do everything everyone needs it to do, and apparently there is a lot it can't do, so I guess we continue to allow people to also pass in an http_client? Or we figure out some kind of factory to use this client config with the various options?
2. There are several additional things that can be modified here; we could add more to the client config:
   • max redirects
   • retries
   • keep-alive timeout
   • http version
3. Finally, update [rb] allow setting socket timeout and interval from http client #16472 to use this approach to support websocket values as well

🔄 Types of changes

• New feature (non-breaking change which adds functionality and tests!)

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PR Type

Enhancement

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Description

• Introduces ClientConfig immutable data class for HTTP client customization

• Allows passing client_config to driver constructors and bridge initialization

• Implements validation to prevent conflicting http_client and client_config parameters

• Refactors bridge initialization with URL normalization and server URL handling

• Adds comprehensive test coverage for new client config functionality

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Diagram Walkthrough

flowchart LR
  Driver["Driver Constructor"]
  Bridge["Bridge Initialize"]
  ClientConfig["ClientConfig Data Class"]
  HttpClient["Http::Default Client"]
  
  Driver -->|"client_config param"| Bridge
  Bridge -->|"validates params"| ClientConfig
  ClientConfig -->|"builds from config"| HttpClient
  Bridge -->|"uses http_client"| HttpClient

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File Walkthrough

	Relevant files
Enhancement	4 files client_config.rb Create immutable ClientConfig data class                                  +46/-0    driver.rb Update create_bridge to accept client_config                          +2/-2      bridge.rb Refactor initialization with client_config support              +44/-6    common.rb Add server_url? predicate method                                                  +4/-0
Configuration changes	1 files common.rb Add ClientConfig require statement                                              +1/-0
Tests	1 files bridge_spec.rb Add comprehensive bridge initialization tests                        +57/-2
Documentation	5 files client_config.rbs Add type signature for ClientConfig class                                +28/-0    driver.rbs Update driver type signatures for client_config                    +1/-1      bridge.rbs Update bridge type signatures with new methods                      +9/-1      common.rbs Update HTTP common type signatures                                              +6/-4      default.rbs Improve type annotations for HTTP default                                +8/-8

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🟢	No security concerns identified No security vulnerabilities detected by AI analysis. Human verification advised for critical code.
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🟡	🎫 #5678 🔴 Investigate and resolve "Error: ConnectFailure (Connection refused)" occurring on subsequent ChromeDriver instantiations on Ubuntu 16.04.4 with Selenium 3.9.0, Chrome 65, and ChromeDriver 2.35. Provide steps or fixes ensuring multiple ChromeDriver instances can be created without connection refusal after the first instance.
🟡	🎫 #1234 🔴 Ensure Selenium 2.48 triggers JavaScript in link href on click() in Firefox 42 (regression from 2.47.1). Provide fix or behavior parity for click() event handling invoking href JavaScript.
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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	Avoid using shared global state Set extra_headers and user_agent on the http instance instead of the Http::Common class to avoid race conditions with concurrent drivers. rb/lib/selenium/webdriver/remote/bridge.rb [676-688] def build_http_client(client_config) if client_config http = Http::Default.new(open_timeout: client_config.open_timeout, read_timeout: client_config.read_timeout) http.proxy = client_config.proxy if client_config.proxy - Http::Common.extra_headers = client_config.extra_headers if client_config.extra_headers - Http::Common.user_agent = client_config.user_agent if client_config.user_agent + http.extra_headers = client_config.extra_headers if client_config.extra_headers + http.user_agent = client_config.user_agent if client_config.user_agent else http = Http::Default.new end http end Apply / Chat Suggestion importance[1-10]: 10 __ Why: The suggestion correctly identifies a critical race condition caused by setting extra_headers and user_agent on a class variable, which is shared state across all driver instances.	High
High-level	Avoid using global HTTP configuration The configuration for extra_headers and user_agent is currently applied globally to the Http::Common class. This should be changed to apply to the specific HTTP client instance to prevent race conditions when using multiple drivers. Examples: rb/lib/selenium/webdriver/remote/bridge.rb [682-683] Http::Common.extra_headers = client_config.extra_headers if client_config.extra_headers Http::Common.user_agent = client_config.user_agent if client_config.user_agent Solution Walkthrough: Before: # File: rb/lib/selenium/webdriver/remote/bridge.rb def build_http_client(client_config) if client_config http = Http::Default.new(...) http.proxy = client_config.proxy # These are class-level attributes, creating global state Http::Common.extra_headers = client_config.extra_headers Http::Common.user_agent = client_config.user_agent else http = Http::Default.new end http end After: # File: rb/lib/selenium/webdriver/remote/bridge.rb def build_http_client(client_config) if client_config http = Http::Default.new(...) http.proxy = client_config.proxy # These should be instance-level attributes http.extra_headers = client_config.extra_headers http.user_agent = client_config.user_agent else http = Http::Default.new end http end # File: rb/lib/selenium/webdriver/remote/http/common.rb # ... remove class-level accessors and add instance-level ones Suggestion importance[1-10]: 9 __ Why: This suggestion correctly identifies a critical design flaw where per-driver configurations are set on global class variables, which will cause race conditions and incorrect behavior in common parallel execution scenarios.	High
General	Improve clarity of error message Update the error message in validate_server_url_args to correctly refer to client_config instead of the misleading http_client. rb/lib/selenium/webdriver/remote/bridge.rb [690-696] def validate_server_url_args(url, client_config) if url && client_config&.server_url - raise Error::WebDriverError, 'Cannot specify url in both keyword and http_client' + raise Error::WebDriverError, 'Cannot specify url in both keyword and client_config' elsif url.nil? && !client_config&.server_url raise Error::WebDriverError, 'No server URL provided' end end Apply / Chat Suggestion importance[1-10]: 4 __ Why: The suggestion correctly points out a misleading error message and proposes a clearer alternative, which improves developer experience.	Low
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