fix(client/transport/stream): check for nil pointer

[dinistavares]

Description

I noticed when you create a StreamableHTTP and pass empty options, there is the possibility for the application to crash due to a nil pointer on the empty option.

Fixes #<issue_number> (if applicable)

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• MCP spec compatibility implementation
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring (no functional changes)
• Performance improvement
• Tests only (no functional changes)
• Other (please describe):

Checklist

• My code follows the code style of this project

• I have performed a self-review of my own code

• I have added tests that prove my fix is effective or that my feature works

• I have updated the documentation accordingly

• This PR implements a feature defined in the MCP specification

• Link to relevant spec section: Link text

• Implementation follows the specification exactly

Additional Information

If you would like to replicate the issue, you can try this:

var httpOptions mcpTransport.StreamableHTTPCOption

// Create MCP streamable HTTP transport
transport, err := mcpTransport.NewStreamableHTTP(<MCP_SERVER_URL>, httpOptions)

Summary by CodeRabbit

• Bug Fixes
  • Improved stability by preventing potential errors during initialization when optional settings are not provided.

[coderabbitai]

Walkthrough

A nil check was introduced before invoking option functions in the NewStreamableHTTP constructor. This adjustment ensures that only non-nil options are executed, preventing potential runtime panics that could occur if any option was nil during initialization.

Changes

File(s)	Change Summary
client/transport/streamable_http.go	Added nil checks before calling option functions in constructor.

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (1.64.8)

Error: you are using a configuration file for golangci-lint v2 with golangci-lint v1: please use golangci-lint v2
Failed executing command with error: you are using a configuration file for golangci-lint v2 with golangci-lint v1: please use golangci-lint v2

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📜 Recent review details

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Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 25775b4 and efd7a1f.

📒 Files selected for processing (1)

• client/transport/streamable_http.go (1 hunks)

🔇 Additional comments (1)

client/transport/streamable_http.go (1)

106-108: Nil-check correctly guards against nil option functions – solid fix

The added guard cleanly prevents the panic without altering existing behaviour. No further issues found.

✨ Finishing Touches

• 📝 Generate Docstrings

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