Overview
Cap'n Web is a new RPC system designed for browsers and web servers, implemented in pure TypeScript. It offers a human-readable serialization format using JSON, supports bidirectional calling, and allows for seamless integration with TypeScript, making it a powerful tool for modern web applications.
What You'll Learn
1
How to implement a bidirectional RPC system using Cap'n Web
2
Why using JSON for serialization improves readability in RPC
3
When to apply promise pipelining for efficient network calls
Prerequisites & Requirements
- Basic understanding of RPC concepts
- Familiarity with TypeScript and JavaScript
Key Questions Answered
What is Cap'n Web and how does it differ from Cap'n Proto?
Cap'n Web is an RPC protocol designed for web applications, implemented in TypeScript, and differs from Cap'n Proto by having no schemas and utilizing JSON for serialization. This makes it more lightweight and easier to integrate into existing JavaScript environments.
How does Cap'n Web support bidirectional calling?
Cap'n Web allows both clients and servers to call each other, enabling bidirectional communication. This is achieved by passing functions and objects by reference, allowing the server to invoke client-side callbacks seamlessly.
What are the security features of Cap'n Web?
Cap'n Web employs an object-capability model for security, ensuring that only authenticated sessions can perform operations. This prevents unauthorized access and maintains a clear boundary of capabilities between client and server.
How does Cap'n Web handle serialization?
Cap'n Web uses JSON for serialization, with a preprocessing step to handle special types like Dates and arrays. This ensures that the data remains human-readable while supporting complex data structures.
Key Statistics & Figures
Size of Cap'n Web library
under 10 kB
This size is achieved through minification and gzip compression, making it lightweight and efficient for web use.
Technologies & Tools
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Programming Language
Typescript
Used to implement the Cap'n Web RPC protocol, allowing for type safety and ease of integration with JavaScript.
Data Format
JSON
Serves as the serialization format for data exchanged between clients and servers in Cap'n Web.
Key Actionable Insights
1Utilize Cap'n Web for real-time collaborative applications to leverage its bidirectional calling feature.This is particularly useful in scenarios where clients need to respond to server events or vice versa, enhancing interactivity in web applications.
2Implement promise pipelining to reduce network latency by chaining RPC calls without waiting for each to complete.This can significantly improve performance in applications that require multiple sequential data fetches, as it minimizes the number of round trips to the server.
3Adopt the object-capability model of Cap'n Web to enhance security in your RPC implementations.By ensuring that only authenticated sessions can access certain methods, you can better protect sensitive operations from unauthorized access.
Common Pitfalls
1
Failing to properly manage object references can lead to broken RPC calls.
It's essential to understand how Cap'n Web handles references and ensure that objects are correctly passed and managed across the RPC boundary to avoid runtime errors.
2
Neglecting to implement proper error handling for network failures can lead to unresponsive applications.
As with any networked application, it's crucial to implement robust error handling to manage situations where network calls fail or time out, ensuring a smooth user experience.
Related Concepts
Remote Procedure Calls (rpc)
Object-capability Security Models
Promise Pipelining In Asynchronous Programming
Comparative Analysis Of Rpc Vs REST And Graphql