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  3. What Is WebSocket? | How Does It Work?

What Is WebSocket? | How Does It Work?

  • By Gcore
  • October 25, 2023
  • 7 min read
What Is WebSocket? | How Does It Work?

WebSocket is a communication protocol that provides full-duplex, real-time communication channels over a single, long-lived connection between a client (such as a web browser) and a server. Unlike the traditional HTTP request-response model, WebSocket allows the server to send data to the client without being prompted, making it ideal for applications that require real-time updates, such as online games, chat applications, and live news updates. Read on to learn about how WebSocket works, use cases, limitations, best practices, and implementation.

What Is WebSocket?

WebSocket is a communication protocol that enables real-time data exchange between a web server and a client, such as a web browser. Unlike the traditional HTTP method of loading web pages, where each piece of data requires a separate request and response, WebSocket keeps a single connection open for as long as the application is running. This means that the client and server can communicate seamlessly to handle text, audio, and video data, which makes the protocol suitable for applications that require instant responses or updates, such as chat, live streaming, collaborative editing, stock tickers, and video gaming.

WebSocket provides full-duplex (i.e., bidirectional) communication channels to enable client-server interaction over a single, persistent Transmission Control Protocol (TCP) connection. Let’s break down what these terms mean:

  • Persistent: The WebSocket connection is persistent, meaning it stays open until either the client or server decides to close it. This results in significantly lower latency, making WebSocket ideal for applications that require quick, real-time interactions.
  • Full-duplex: Full-duplex communication means that data transmission can occur between clients and servers simultaneously, without either having to wait for a response. This allows for more interactive and dynamic applications whereby client and server can update simultaneously. For example:
    • In a chat application like Facebook Messenger you can receive messages while typing your own.
    • In a stock trading application, you can get real-time price updates while executing trades.
    • In a multiplayer online game, each player’s game state—like position, health, or score—can be updated while playing the game.

How Does WebSocket Work?

WebSocket connections start with a standard HTTP request from the client to the server, asking to upgrade the connection to WebSocket—known as the “handshake.” If the server supports WebSocket, it responds with an HTTP status code of 101, indicating that the server is switching to WebSocket protocol. From that point on, the initial HTTP connection is upgraded to a WebSocket connection, which operates over the same underlying TCP/IP connection. The client and server can exchange messages seamlessly and simultaneously. The connection stays open until one side closes it.

Following the image above, we can look at this process as a four-stage process flow:

Step 1. The client initiates an HTTP connection.

Step 2. WebSocket establishes a handshake between the client and server that makes WebSocket compatible with HTTP ports (80 and 443) and proxies.

The handshake involves sending an HTTP upgrade request header from the client to the server, requesting a protocol switch from HTTP to WebSocket. The server then responds with an upgrade response, acknowledging the switch. This response will include a special “Upgrade” header as well as a “Connection” header, both indicating the WebSocket protocol.

Step 3. Both the client and server exchange messages freely via an open, persistent connection that doesn’t require continuous polling or new HTTP requests.

This is achieved through a message-based communication model, where each message is wrapped in a WebSocket frame which contains the actual message payload, along with additional information such as the frame type and length. The message type (binary or text-based) depends on the application’s requirements.

Step 4. The connection remains open until one side closes the channel, at which point the connection closes and the client-server engagement ends.

How Does WebSocket Handle Connection Failures?

In the context of WebSocket, a connection failure refers to the inability to establish or maintain a stable communication link between the client and the server. Reasons can include network problems, server downtime, or timeouts. In other words, a connection failure means the WebSocket connection is dropped.

WebSocket has built-in mechanisms to handle connection failures. When a connection is lost, both the client and server are informed with specific error codes that point to the cause of the problem. For example, the onerror event in JavaScript can be used to handle WebSocket errors, and the onclose event can be used to handle a closed connection. In addition, many WebSocket libraries offer options to attempt automatic reconnection.

WebSocket vs. HTTP

WebSocket and HTTP are both protocols used for communication over the web, but they serve different purposes and operate differently. Let’s take a look at their differences in the table below.

FeatureWebSocketHTTP
Communication modelHas a full-duplex/bidirectional model. Once the connection is established, either party can send updates without being prompted.Has a unidirectional request-response model (client requests, server responds.)
LifespanOffers a stateful, persistent connection that is ideal for instant data transmission without the overhead of constant request and response cycles.Provides a stateless connection that requires establishing a new connection for each request. Uses long polling, a mechanism designed to help keep HTTP client-server connections alive until a request or response is fetched.
Latency/overheadEliminates the need for frequent handshakes, header negotiation, and long polling, thus offering lower latency and limiting overhead. Messages are sent in frames without the need for redundant header information, since connection is persistent.Requires new handshakes and header negotiation for each request, meaning higher latency and overhead.
TCPNatively supports TCP only. TCP provides data packet delivery in order, with mechanisms for error detection, retransmission and congestion control, leading to high reliability.Runs on TCP, but HTTP3 uses User Datagram Protocol (UDP) to boost network speed.
Event orderingDoes not follow request-response order once connection is established; either client or server can send updates.Uses a request-response pattern that is ideal for websites or apps that require packet synchronization in query-result order.
CachingDoes not support caching since it is mostly suited for dynamic data transmission. Supports real-time updates only.Caches static data to speed up response delivery.
Binary data supportHandles binary data transmission natively, allowing the efficient transfer of multimedia content like images and videos.Natively text-based. Requires additional protocols or encoding (e.g., Base64) to handle binary data.
Encryption and addressOffers a secure (encrypted) version. The address of the unencrypted version starts with ws:// and the encrypted version with wss://.Offers similar functionalities to WebSocket via http:// and https://.

WebSocket Use Cases

WebSocket can be used in combination with other protocols. For example, WhatsApp uses WebSocket with the Extensible Messaging and Presence Protocol (XMPP) for user communication. Let’s explore some use cases for which WebSocket is particularly suitable.

High-Frequency Data Transmission

WebSocket is ideal for applications that must transmit high-frequency data instantly. This includes, for example, text, voice and video chat applications such as WhatsApp, Slack, Zoom, and Skype.

Suppose a user initiates a WhatsApp connection by sending a message to a friend. WebSocket implements the server handshake and upgrades the connection to let the user send as many messages as required without having to wait for a server response. In this way, the friends can send and receive messages simultaneously.

WebSocket also enables the WhatsApp server to notify the client when a message is being typed, has been sent (one tick), delivered (two ticks) and read (two blue ticks.) It also enables notifications about new messages and status updates.

Similarly, a Zoom user sends a server request by clicking on a Zoom link, requesting to join a meeting. WebSocket allows all participants in the meeting to send and receive instant video and audio updates and enables Zoom to send notifications on user presence, participant status (e.g., microphone on/off,) and chat messages.

Real-Time Sync

Applications used by multiple users can also use WebSocket to facilitate the synchronization of all changes. For example, collaborative editing tools such as Google Docs use WebSocket.

When a user makes a change in Google Docs, the WebSocket connection allows the server to instantly notify other connected users about the update, ensuring that everyone sees the changes concurrently. It also enables cursor tracking and helps users keep track of the time and number of changes made.

Live Updates

WebSocket is ideal for financial applications. An app such as Robinhood can deliver real-time information, and update it as it changes.

To do this, Robinhood installs a WebSocket-based stock management server. The server is configured to constantly monitor various exchanges and send instant updates to connected clients. This way, clients receive instantaneous price changes, order fills, and portfolio updates without having to repeatedly request the information.

Multi-Client Interactions

Gaming applications require multiple gamers to interact and compete at the same time. WebSocket can help facilitate this. Players in a car race game can race against one another with all parties receiving live updates as the race progresses. At the end of the game, all users receive stats containing their scores, positions, and rewards.

Live Streaming and Broadcasting

WebSocket can be used to stream live audio or video content, and broadcast messages to connected stream viewers. The chat window updates continuously, creating a dynamic, interactive environment where viewers can seamlessly engage with each other and the streamer.

For example, with YouTube live streams, content producers can reach their followers simultaneously. WebSocket allows YouTube to encode the video using the MediaRecorder API while concurrently sending the video to the server, which instantly broadcasts it to viewers.

Location Tracking

Organizations in the transport and delivery industries, such as Uber and Lift, leverage WebSocket to      build their ordering and dispatch apps. Uber users receive live updates on the location of the vehicle, estimated time of arrival, and details of the specific vehicle. If a driver cancels a planned pick up, the user is updated right away with details of the newly allocated driver.

Limitations of WebSocket

WebSocket has two important limitations: resource usage and scalability.

Resource Usage

WebSocket’s persistent, bidirectional connections come at the cost of increased complexity and memory usage. Keeping client-server connections open for extended periods is resource intensive for servers, requiring additional memory resources.

Scalability

Given their resource demands, scaling WebSocket-based apps—whether horizontally or vertically—can be problematic.

  • Vertical scaling is implemented by increasing the size of a single WebSocket server.
  • Horizontal scaling involves provisioning multiple server instances, to distribute and reduce the processing workload of each server. While horizontal scaling is considered the superior option—as it ensures server redundancy and provides potentially unlimited server space—it is also more complex. This is particularly true if your implementation is manual, because you must ensure interoperability between all the servers.

These limitations can be cushioned by choosing reputable service providers for load balancing and traffic routing.

Implementing WebSocket: 4 Best Practices

To effectively implement WebSocket, adhere to the best practices provided below.

1. Manage Bandwidth

WebSocket connections can consume significant amounts of bandwidth, especially in applications with high-frequency updates or large dataset transmissions. To manage bandwidth effectively, implement strategies like throttling, compression, and data batching. Throttling limits the rate at which messages are sent or received. Compression reduces payload size, and data batching combines multiple updates into a single message.

Optimize message payload through efficient serialization formats such as JSON or Protocol Buffers. Compress payloads using techniques like gzip compression.

2. Enforce Security

Cyber criminals can easily eavesdrop, hijack and steal unencrypted data flowing through the web application. To prevent this, implement encryption, authentication, and authorization mechanisms; verify the legitimacy of WebSocket connections; and control access to sensitive information. This ensures that only authorized users can establish WebSocket connections and access packet contents, protecting sensitive data and preventing unauthorized usage. To encrypt data in WebSocket apps, use wss:// via nginx (this would require help from an expert.)

3. Plan for Scalability

Design your WebSocket implementation with scalability in mind because in real-time scenarios, you may have a large number of concurrent connections. Consider techniques such as load balancing, clustering, and horizontal scaling to help you handle increasing traffic and ensure smooth user experience.

4. Test and Monitor Performance

Test your WebSocket implementation thoroughly to ensure its stability and reliability under different scenarios. Use load-testing tools (e.g., Apache JMeter, Gatling) to simulate high levels of concurrent connections and measure the app’s capacity, and check for appropriate error messages for both client- and server-side users. Using monitoring tools (e.g., MiddleWare), monitor the server-side performance, track metrics, and implement logging to diagnose and troubleshoot issues.

Conclusion

WebSocket has revolutionized web communication by offering full-duplex, bidirectional, real-time data transfer capabilities. WebSocket opens doors to endless possibilities and empowers organizations to build dynamic, responsive, and immersive web applications. If your app requires real-time data transfer, persistent connections, and bidirectional communication, leverage WebSocket’s many advantages to improve user experience and drive up your app’s user traffic and revenue.

Gcore’s CDN can help you in all the use cases described above. It abstracts away the scalability issues associated with WebSocket. With 100% guaranteed uptime according to reviews, you don’t have to worry about vertical scaling. Horizontally, the CDN is also easy to use and manage, absolving the complexities associated with provisioning multiple server instances. Experience it yourself today!

Try our CDN for free!

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What is a CDN?

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How to Migrate Your Video Files to Gcore Video Streaming

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5 Ways to Improve Website Speed for E-Commerce

In part 1 of this guide, we explained why site speed matters for e-commerce and how you can track your current speed.Now, speed up your page load times with these five techniques.#1 Assess Your Current Site SpeedFirst, check your site’s current performance. Use tools like Google PageSpeed Insights or real user monitoring (RUM) tools. PageSpeed Insights evaluates individual web pages for mobile and desktop performance, providing actionable insights to improve speed and user experience.Here’s an example of how your metrics might look:#2 Adopt Code and Image Optimization TechniquesE-commerce websites often have a huge number of images, videos, and/or animations, which can slow down load times. Since these media are essential, the key is to optimize all heavy components.Compress images and use lazy loading via your website host. Minimize redirects and remove broken links, consulting a technical SEO expert if required. These actions can significantly reduce page weight.#3 Adopt CDNs and Edge ComputingThe majority of online shoppers have purchased from an e-commerce store in another country and an additional 22% plan to in the future. Hosting location impacts speed. The further your servers are physically located from your customers, the higher the latency. So, having servers distributed globally improves your load speed and allows you to deliver great customer experiences, no matter where your customers are located.Imagine that your e-commerce website is hosted on a web server in the US, but you have shoppers from the EU. When shoppers from the US browse your store, they may not experience much latency. But shoppers from Germany will, because of the time it takes their browser to send requests to your US server, wait for the server to process them, and deliver a response. A reliable CDN and edge computing provider caching your website content—images, videos, payment portals and all—at the edge makes for speedy content delivery globally.In addition to shortening the distance between your servers and buyers, CDNs also enable load balancing. Say you’re running a Black Friday sale with traffic surges far beyond your normal quantities. Your CDN provider can distribute the traffic evenly between its network of available servers, preventing any one server from being overworked, thereby improving server response times. So, if your Black Friday surge comes mostly from the New York area, a CDN can push some of that traffic from the New York, NY server to the nearby Manassas, VA and Boston, CT servers. Customers won’t notice a difference since both servers are nearby, but spreading the load means all servers continue to perform optimally.#4 Use Fast Authoritative DNSDNS is like the internet’s phone book, translating human-friendly domain names (like www.example.com) into IP addresses that computers use to find each other. When this translation happens quickly, it reduces the time it takes for a user’s browser to locate your website, leading to faster page load times.#5 Rinse and RepeatSite speed optimization is continuous. The internet changes daily; technology advances and competitors emerge. Don’t get comfortable with your site speed. Continuously track speed scores and make improvements.Website Speed Solutions in One Intuitive PlatformWebsite speed is a game-changer for e-commerce success. A website that loads in under a second is the magic number to boost user experience, slash bounce rates, and skyrocket your e-commerce business’ conversion rates.Stay ahead of your e-commerce competitors by choosing tools and platforms designed with your e-commerce website speed in mind. With 180+ PoPs worldwide and a 200+ Tbps network capacity, Gcore CDN and DNS are ideal speed optimization solutions for global e-commerce sites. Contact us today to discover how we can supercharge your site speed.Explore CDN for e-commerce

What Website Speed Is and Why It Matters for E-commerce Success

Website visitors are more impatient than ever—websites that take longer than three seconds to load lose more than half their visitors. For an e-commerce business, that translates to losing half its potential sales, which is bad news for revenue. In this article, we explain what e-commerce website speed is, how it’s measured, and how you can improve it for better customer retention and higher sales.Why Does Site Speed Matter?Website speed measures the time from when visitors click your link to when they see a fully functioning page. With the surge in e-commerce businesses around the world, buyers have many choices and will quickly abandon slow-loading websites out of frustration. Most customers won’t return to a slow website, and 89% will turn to a faster competitor. Satisfied customers are more likely to recommend your website to others, making high user satisfaction an effective marketing strategy.Just a second—or less—of load time can make the difference between a potential customer purchasing from you or your competitor. Conversion rates drop markedly with every additional second of load time. If your site loads in one second or less, you’re looking at a 3% conversion rate. That almost halves when you add just one second of wait time.That’s not surprising, since churn and bounce rates increase with slower load times, meaning potential buyers either leave your site before interacting and/or don’t return.Page load times also affect search engine optimization (SEO) rankings—your spot on search engine results pages. When buyers search for your products, if you don’t appear at the top, your competitors will—and your customers are more likely to visit their site instead of yours.Evidently, optimizing page load time is a non-negotiable for any e-commerce business.Metrics and Indicators to TrackSpeed can be measured and reflected by either technical or business metrics.Technical IndicatorsGoogle Core Web Vitals are metrics that measure various features contributing to a high-quality page experience. They’re an industry-standard way to measure your technical website load speed.Largest contentful paint (LCP) is the time it takes for the largest content on your site to load. An ideal LCP value is below 2.5 seconds, while above 4 seconds signals a poor page experience.First input delay (FID) is the delay between a user’s interaction (e.g., clicking a button) and the browser’s response. Google considers any FID value below 100 ms good, and above 300 ms poor.Cumulative layout shift (CLS) measures how much your content moves around while loading. Poor CLS can cause users to accidentally click on the wrong buttons.Keep track of the following additional technical metrics:Time to first byte (TTFB) is the time between a browser requesting your webpage and the first byte of data arriving. It often triggers the “reduce initial server response time” message in page speed diagnostics.Time to interactive (TTI) measures the time it takes for your website to become fully interactive. Google considers a TTI of below 5 seconds good, and above 7.3 seconds poor.Round-trip time (RTT) is the time it takes for requests to reach the origin server, be processed, and return to the client.Business MetricsThese metrics give you insights into how your website’s speed impacts sales. Although they’re not a direct speed measurement, speed has a direct impact on them.Conversion rate measures the percentage of your website’s visitors who make a purchase.Engagement time measures how much time customers actively spend on your website, such as browsing products or making a purchase. It’s connected to bounce rate, which is the opposite—how many customers leave your site without engaging at all, often caused by slow loading.Search ranking affects your site’s visibility, traffic, and revenue. Fast load times contribute to better SEO rankings.Explore part 2 of this guide to discover 5 practical tips to speed up your e-commerce website performance.

Improve Your Privacy and Data Security with TLS Encryption on CDN

The web is a public infrastructure: Anyone can use it. Encryption is a must to ensure that communications over this public infrastructure are secure and private. You don’t want anyone to read or modify the data you send or receive, like credit card information when paying for an online service.TLS encryption is a basic yet crucial safeguard that ensures only the client (the user’s device, like a laptop) and server can read your request and response data; third parties are locked out. You can run TLS on a CDN for improved performance, caching, and TLS management. If you want to learn more about TLS and how running it on a CDN can improve your infrastructure, this is the right place to start.What Is TLS Encryption and Why Does It Matter?TLS, transport layer security, encrypts data sent via the web to prevent it from being seen or changed while it’s in transit. For that reason, it’s called encryption in-transit technology. TLS is also commonly called HTTPS when used with HTTP or SSL, as previous versions of the technology were based on it. TLS ensures high encryption performance and forward secrecy. To learn more about encryption, check out our dedicated article.TLS is a vital part of the web because it ensures trust for end users and search engines alike. End users can rest assured that their data—like online banking information or photos of their children—can’t be accessed. Search engines know that information protected by TLS is trustworthy, so they rate it higher than non-protected content.What’s the Connection Between TLS and CDN?A CDN, or content delivery network, helps improve your website’s performance by handling the delivery of your content from its own servers rather than your website’s server. When a CDN uses TLS, it ensures that your content is encrypted as it travels from your server to the CDN and from the CDN to your users.With TLS offloading, your server only needs to encrypt the content for each CDN node, not for every individual user. This reduces the workload on your server.Here’s a simple breakdown of how it works:Your server encrypts the content once and sends it to the CDN.The CDN caches this encrypted content.When a user requests the content, the CDN serves it directly to them, handling all encryption and reducing the need to repeatedly contact your server.Without a CDN, your server would have to encrypt and send content to each user individually, which can slow things down. With a CDN, your server encrypts the content once for the CDN. The CDN then takes over, encrypting and serving the content to all users, speeding up the process and reducing the load on your server.Figure 1: Comparison of how content is served with TLS on the web server (left) vs on CDN (right)Benefits of “Offloading” TLS to a CDNOffloading TLS to a CDN can improve your infrastructure with improved performance, better caching, and simplified TLS management.Increased PerformanceWhen establishing a TLS connection, the client and server must exchange information to negotiate a session key. This exchange involves four messages being sent over the network, as shown in Figure 2. The higher the latency between the two participants, the longer it takes to establish the connection. CDN nodes are typically closer to the client, resulting in lower latency and faster connection establishment.As mentioned above, CDN nodes handle all the encryption tasks. This frees up your server’s resources for other tasks and allows you to simplify its code base.Figure 2: TLS handshakeImproved CachingIf your data is encrypted, the CDN can’t cache it. A single file will look different from the CDN nodes for every new TLS connection, eliminating the CDN benefits (Figure 3). If the CDN holds the certificates, it can negotiate encryption with the clients and collect the files from your server in plaintext. This allows the CDN to cache the content efficiently and serve it faster to users.Figure 3: TLS and CDN caching comparedSimplified TLS ManagementThe CDN takes care of maintenance tasks such as certificate issuing, rotation, and auto-renewal. With the CDN managing TLS, your server’s code base can be simplified, and you no longer need to worry about potential TLS updates in the future.TLS Encryption with Gcore CDNWith the Gcore CDN we don’t just take care of your TLS encryption, but also file compression and DNS lookups. This way, you can unburden your servers from non-functional requirements, which leads to smaller, easier-to-maintain code bases, lower CPU, memory, and traffic impact, and a lower workload for the teams managing those servers.Gcore CDN offers two TLS offloading options:Free Let’s Encrypt certificates with automatic validation, an effective and efficient choice for simple security needsPaid custom certificates, ideal if your TLS setup has more complex requirementsHow to Enable HTTPS with a Free Let’s Encrypt CertificateSetting up HTTPS for your website is quick, easy, and free. First, make sure you have a Gcore CDN resource for your website. If you haven’t created one yet, you can do so in the Gcore Customer Portal by clicking Create CDN resource in the top-right of the window (Figure 4) and following the setup wizard. You’ll be asked to update your DNS records so they point to the Gcore CDN, allowing Gcore to issue the certificates later.Figure 4: Create CDN resourceNext, open the resource settings by selecting your CDN resource from the list in the center (Figure 5).Figure 5: Select the CDN resourceEnable HTTPS in the resource settings, as shown in Figure 6:Select SSL in the left navigationClick the Enable HTTPS checkboxClick Get SSL certificateFigure 6: Get an SSL certificateYour certificate will usually be issued within 30 minutes.Our Commitment to Online SecurityAt Gcore, we’re committed to making the internet secure for everyone. As part of this mission, we offer free CDN and free TLS certificates. Take advantage and protect your resources efficiently for free!Get TLS encryption on Gcore CDN free

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