EP26: Proxy vs reverse proxy

On this subject, we are going to cowl:

Postman simplifies every step of the API lifecycle and streamlines collaboration so you possibly can create higher APIs—quicker. The platform is cloud-native and contains the great suite of options enterprises are searching for, together with SSO, audit, platform safety, and far more.

API repository

Postman can retailer and handle API specs, documentation, workflow recipes, take a look at circumstances and outcomes, metrics, and all the things else associated to APIs.

Workspaces

Postman workspaces are collaborative locations the place groups collect and resolve issues. Each individual in a workspace sees the identical API instruments, collections, and environments, that are up to date in real-time.

API lifecycle

The Postman platform features a complete set of instruments that assist speed up the API lifecycle—from design, testing, documentation, and mocking to the sharing and discoverability of your APIs.

Governance

Postman’s full-lifecycle strategy to governance lets adopters shift left of their improvement practices, producing better-quality APIs and fostering collaboration between developer and API design groups.

Study extra about Postman

The diagram under reveals the variations between a ahead proxy and a reverse proxy.

A ahead proxy is usually used for: 

1. Shield shoppers

2. Keep away from shopping restrictions

3. Block entry to sure content material

• A reverse proxy is a server that accepts a request from the shopper, forwards the request to internet servers, and returns the outcomes to the shopper as if the proxy server had processed the request.

A reverse proxy is sweet for:

1. Shield servers

2. Load balancing

3. Cache static contents

4. Encrypt and decrypt SSL communications

The CAP theorem is likely one of the most well-known phrases in pc science, however I guess completely different builders have completely different understandings. Let’s study what it’s and why it may be complicated. 

CAP theorem states {that a} distributed system cannot present greater than two of those three ensures concurrently.

Consistency: consistency means all shoppers see the identical information on the identical time regardless of which node they connect with.

Availability: availability means any shopper which requests information will get a response even when a number of the nodes are down.

Partition Tolerance: a partition signifies a communication break between two nodes. Partition tolerance means the system continues to function regardless of community partitions. 

The “2 of three” formulation could be helpful, however this simplification may very well be deceptive.

1. Selecting a database will not be straightforward. Justifying our alternative purely based mostly on the CAP theorem will not be sufficient. For instance, firms do not select Cassandra for chat functions just because it’s an AP system. There’s a checklist of fine traits that make Cassandra a fascinating possibility for storing chat messages. We have to dig deeper.

2. “CAP prohibits solely a tiny a part of the design house: good availability and consistency within the presence of partitions, that are uncommon”. Quoted from the paper: CAP Twelve Years Later: How the “Guidelines” Have Modified.

3. The theory is about 100% availability and consistency. A extra lifelike dialogue could be the trade-offs between latency and consistency when there is no such thing as a community partition. See PACELC theorem for extra particulars.

Is the CAP theorem actually helpful?
I believe it’s nonetheless helpful because it opens our minds to a set of tradeoff discussions, however it’s only a part of the story. We have to dig deeper when selecting the correct database.

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What’s CDN (Content material Supply Community)? How does CDN make content material supply quicker?

The diagram under reveals why. 

A CDN refers to geographically distributed servers (additionally known as edge servers) that present quick supply of static and dynamic content material. 

With CDN, customers don’t must retrieve content material (music, video, recordsdata, photos, and so on.) from the origin server. As a substitute, the content material is cached at CDN nodes across the globe, and customers can retrieve the content material from close by CDN nodes.

The advantages of CDN are:

1. Decreasing latency

2. Decreasing bandwidth

3. Bettering web site safety, particularly defending in opposition to DDoS (Distributed Denial-of-Service) assault 

4. Rising content material availability