Sentry, Now With Logs (Sponsored)

Failed checkouts, dropped jobs, timeouts that don’t even throw errors ➡️ these are the issues that slow your team down.

With Sentry Logs, you can trace every step, from the user’s request through your code to the log line. And because Logs connect automatically with your errors, traces, and even replays, all your debugging context lives in one place.

TLDR: Sentry has Logs. More context, fewer tabs, faster fixes, more time shipping.

Try Sentry for Free

This week’s system design refresher:

Cloudflare vs. AWS vs. Azure
Popular Backend Tech Stack
HTTP vs. HTTPS
Forward Proxy versus Reverse Proxy
Concurrency is NOT Parallelism
SPONSOR US

Cloudflare vs. AWS vs. Azure

Cloudflare is much more than just a CDN and DDoS protection service. Let’s do a quick comparison of Cloudflare, AWS, and Azure.

Cloudflare has rapidly expanded beyond its traditional CDN roots, launching a suite of modern developer-first services like Workers, R2, D1, and so on. These offerings position it as a serious edge-native alternative to other cloud providers.

Here are the key cloud capabilities that Cloudflare supports:

Edge Compute and Serverless
Object and Blob Storage
Relational Databases
Containers
Sandboxes
Workflows
AI Agents SDK
Vector and AI search
Data Connectivity
AI Infrastructure
Content Delivery Network
DNS
Load Balancing

Over to you: Have you used Cloudflare’s new offerings? What are your thoughts on them?

Popular Backend Tech Stack

HTTP vs. HTTPS

When you open a website, the difference between HTTP and HTTPS decides whether your data travels safely or in plain sight. Here’s what actually happens under the hood:

HTTP:

Sends data in plain text, anyone on the network can intercept it.
The client and server perform a simple TCP handshake: SYN, SYN-ACK, ACK
Fast but completely insecure. Passwords, tokens, and forms can all be read in transit.

HTTPS (SSL/TLS):

Step 1: TCP Handshake: Standard connection setup.
Step 2: Certificate Check: Client says hello. Server responds with hello and its SSL/TLS certificate. That certificate contains the server’s public key and is signed by a trusted Certificate Authority.
Your browser verifies this certificate is legitimate, not expired, and actually belongs to the domain you’re trying to reach. This proves you’re talking to the real server, not some attacker pretending to be it.
Step 3: Key Exchange: Here’s where asymmetric encryption happens. The server has a public key and a private key. Client generates a session key, encrypts it with the server’s public key, and sends it over. Only the server can decrypt this with its private key.
Both sides now have the same session key that nobody else could have intercepted. This becomes the symmetric encryption key for the rest of the session.
Step 4: Data Transmission: Now every request and response gets encrypted with that session key using symmetric encryption.

Over to you: What’s your go-to tool for debugging TLS issues, openssl, curl -v, or something else?

Forward Proxy versus Reverse Proxy

A forward proxy sits between clients (users) and the internet. It acts on behalf of users, hiding their identity or filtering traffic before it reaches the external web.

Some applications of a forward proxy are:

Protect users while browsing the internet.
Helps organizations restrict access to certain websites.
Speeds up web browsing by caching frequently accessed content.

A reverse proxy sits between the internet (clients) and backend servers. It acts on behalf of servers, handling incoming traffic.

Some applications of a reverse proxy are:

Distributes traffic across multiple servers to ensure no single server is overwhelmed.
Handles SSL encryption/decryption so backend servers don’t have to.
Helps protect backend servers from DDoS attacks.

Over to you: What else will you add to understand forward proxy and reverse proxy?

Things Every Developer Should Know: Concurrency is NOT parallelism

In system design, it is important to understand the difference between concurrency and parallelism.

As Rob Pyke(one of the creators of GoLang) stated:“ Concurrency is about 퐝퐞퐚퐥퐢퐧퐠 퐰퐢퐭퐡 lots of things at once. Parallelism is about 퐝퐨퐢퐧퐠 lots of things at once.” This distinction emphasizes that concurrency is more about the 퐝퐞퐬퐢퐠퐧 of a program, while parallelism is about the 퐞퐱퐞퐜퐮퐭퐢퐨퐧.

Concurrency is about dealing with multiple things at once. It involves structuring a program to handle multiple tasks simultaneously, where the tasks can start, run, and complete in overlapping time periods, but not necessarily at the same instant.

Concurrency is about the composition of independently executing processes and describes a program’s ability to manage multiple tasks by making progress on them without necessarily completing one before it starts another.

Parallelism, on the other hand, refers to the simultaneous execution of multiple computations. It is the technique of running two or more tasks or computations at the same time, utilizing multiple processors or cores within a computer to perform several operations concurrently. Parallelism requires hardware with multiple processing units, and its primary goal is to increase the throughput and computational speed of a system.

In practical terms, concurrency enables a program to remain responsive to input, perform background tasks, and handle multiple operations in a seemingly simultaneous manner, even on a single-core processor. It’s particularly useful in I/O-bound and high-latency operations where programs need to wait for external events, such as file, network, or user interactions.

Parallelism, with its ability to perform multiple operations at the same time, is crucial in CPU-bound tasks where computational speed and throughput are the bottlenecks. Applications that require heavy mathematical computations, data analysis, image processing, and real-time processing can significantly benefit from parallel execution.

SPONSOR US

Get your product in front of more than 1,000,000 tech professionals.

Our newsletter puts your products and services directly in front of an audience that matters - hundreds of thousands of engineering leaders and senior engineers - who have influence over significant tech decisions and big purchases.

Space Fills Up Fast - Reserve Today

Ad spots typically sell out about 4 weeks in advance. To ensure your ad reaches this influential audience, reserve your space now by emailingsponsorship@bytebytego.com.

","contentEncoded","freeContentEncoded","textContent","Sentry, Now With Logs (Sponsored)Failed checkouts, dropped jobs, timeouts that don’t even throw errors ➡️ these are the issues that slow your team down.With Sentry Logs, you can trace every step, from the user’s request through your code to the log line. And because Logs connect automatically with your errors, traces, and even replays, all your debugging context lives in one place.TLDR: Sentry has Logs. More context, fewer tabs, faster fixes, more time shipping.Try Sentry for FreeThis week’s system design refresher:Cloudflare vs. AWS vs. AzurePopular Backend Tech StackHTTP vs. HTTPSForward Proxy versus Reverse ProxyConcurrency is NOT ParallelismSPONSOR USCloudflare vs. AWS vs. AzureCloudflare is much more than just a CDN and DDoS protection service. Let’s do a quick comparison of Cloudflare, AWS, and Azure.Cloudflare has rapidly expanded beyond its traditional CDN roots, launching a suite of modern developer-first services like Workers, R2, D1, and so on. These offerings position it as a serious edge-native alternative to other cloud providers.Here are the key cloud capabilities that Cloudflare supports:Edge Compute and ServerlessObject and Blob StorageRelational DatabasesContainersSandboxesWorkflowsAI Agents SDKVector and AI searchData ConnectivityAI InfrastructureContent Delivery NetworkDNSLoad BalancingOver to you: Have you used Cloudflare’s new offerings? What are your thoughts on them?Popular Backend Tech StackHTTP vs. HTTPSWhen you open a website, the difference between HTTP and HTTPS decides whether your data travels safely or in plain sight. Here’s what actually happens under the hood:HTTP:Sends data in plain text, anyone on the network can intercept it.The client and server perform a simple TCP handshake: SYN, SYN-ACK, ACKFast but completely insecure. Passwords, tokens, and forms can all be read in transit.HTTPS (SSL/TLS):Step 1: TCP Handshake: Standard connection setup.Step 2: Certificate Check: Client says hello. Server responds with hello and its SSL/TLS certificate. That certificate contains the server’s public key and is signed by a trusted Certificate Authority. Your browser verifies this certificate is legitimate, not expired, and actually belongs to the domain you’re trying to reach. This proves you’re talking to the real server, not some attacker pretending to be it.Step 3: Key Exchange: Here’s where asymmetric encryption happens. The server has a public key and a private key. Client generates a session key, encrypts it with the server’s public key, and sends it over. Only the server can decrypt this with its private key.Both sides now have the same session key that nobody else could have intercepted. This becomes the symmetric encryption key for the rest of the session.Step 4: Data Transmission: Now every request and response gets encrypted with that session key using symmetric encryption.Over to you: What’s your go-to tool for debugging TLS issues, openssl, curl -v, or something else?Forward Proxy versus Reverse ProxyA forward proxy sits between clients (users) and the internet. It acts on behalf of users, hiding their identity or filtering traffic before it reaches the external web.Some applications of a forward proxy are:Protect users while browsing the internet.Helps organizations restrict access to certain websites.Speeds up web browsing by caching frequently accessed content.A reverse proxy sits between the internet (clients) and backend servers. It acts on behalf of servers, handling incoming traffic.Some applications of a reverse proxy are:Distributes traffic across multiple servers to ensure no single server is overwhelmed.Handles SSL encryption/decryption so backend servers don’t have to.Helps protect backend servers from DDoS attacks.Over to you: What else will you add to understand forward proxy and reverse proxy?Things Every Developer Should Know: Concurrency is NOT parallelismIn system design, it is important to understand the difference between concurrency and parallelism. As Rob Pyke(one of the creators of GoLang) stated:“ Concurrency is about 퐝퐞퐚퐥퐢퐧퐠 퐰퐢퐭퐡 lots of things at once. Parallelism is about 퐝퐨퐢퐧퐠 lots of things at once.” This distinction emphasizes that concurrency is more about the 퐝퐞퐬퐢퐠퐧 of a program, while parallelism is about the 퐞퐱퐞퐜퐮퐭퐢퐨퐧. Concurrency is about dealing with multiple things at once. It involves structuring a program to handle multiple tasks simultaneously, where the tasks can start, run, and complete in overlapping time periods, but not necessarily at the same instant.Concurrency is about the composition of independently executing processes and describes a program’s ability to manage multiple tasks by making progress on them without necessarily completing one before it starts another.Parallelism, on the other hand, refers to the simultaneous execution of multiple computations. It is the technique of running two or more tasks or computations at the same time, utilizing multiple processors or cores within a computer to perform several operations concurrently. Parallelism requires hardware with multiple processing units, and its primary goal is to increase the throughput and computational speed of a system.In practical terms, concurrency enables a program to remain responsive to input, perform background tasks, and handle multiple operations in a seemingly simultaneous manner, even on a single-core processor. It’s particularly useful in I/O-bound and high-latency operations where programs need to wait for external events, such as file, network, or user interactions.Parallelism, with its ability to perform multiple operations at the same time, is crucial in CPU-bound tasks where computational speed and throughput are the bottlenecks. Applications that require heavy mathematical computations, data analysis, image processing, and real-time processing can significantly benefit from parallel execution.SPONSOR USGet your product in front of more than 1,000,000 tech professionals.Our newsletter puts your products and services directly in front of an audience that matters - hundreds of thousands of engineering leaders and senior engineers - who have influence over significant tech decisions and big purchases.Space Fills Up Fast - Reserve TodayAd spots typically sell out about 4 weeks in advance. To ensure your ad reaches this influential audience, reserve your space now by emailing sponsorship@bytebytego.com.","published","strategy","content-ready","locked","deletedAt","isSyncedFromOwnBlog","original","duplicatesCount","duplicateVersion","originalArticleId","errorsCount","appearance","color","backgroundColor","shortSummary","summary","bullets","persons","places","words","sentiment","subject","meta","eventId","22c04faaa1b7708be430e1b0d9caec7e8df6c11671a4221ba3888474b9e1adda","nostrRootEvent","event",{"_19":188,"_192":193,"_194":195,"_67":196,"_208":26,"_158":209,"_210":211},"sig","6a682e11b6b45e963df2c9694faf594c0b9aff3d96d61a8c518a8a5c912b296f2d3a3e21c4623e4880529adf2fe1dd3b85040b9cf1f41bfc6cf23c012ddaab12","kind",1,[197,198,199,203,206],[185,144],[34,150],[200,201,31,202],"a","30023:cd5870305a2d73e3fe5b103df964a49da5ddcc026dc2556ffc8800172b7afc85:80e01e51-795f-4aae-8691-c52542342c97","mention",[204,205],"client","Layer3.press",[207,26,31],"p","pubkey","EP190: Cloudflare vs. AWS vs. Azure\nCloudflare is much more than just a CDN and DDoS protection service. Let’s do a quick comparison of Cloudflare, AWS, and Azure.\n\n\nnostr:naddr1qvzqqqr4gupzpn2cwqc95ttnu0l9kypal9j2f8d9mhxqymwz24hlezqqzu4h4ly9qqjrsvr9xqck2df395mnjdtx956xzct995urvwf3943n2v34xserxdpjvvunwj3rxue ","created_at",1763983801,"authorNPub","markdown","## [Sentry, Now With Logs (Sponsored)](https://bit.ly/Sentry_112225)\n\n[](https://bit.ly/Sentry_112225)\n\nFailed checkouts, dropped jobs, timeouts that don’t even throw errors ➡️ these are the issues that slow your team down.\n\nWith Sentry Logs, you can trace every step, from the user’s request through your code to the log line. And because Logs connect automatically with your errors, traces, and even replays, all your debugging context lives in one place.\n\nTLDR: Sentry has Logs. More context, fewer tabs, faster fixes, more time shipping.\n\n[Try Sentry for Free](https://bit.ly/Sentry_112225)\n\n* * *\n\nThis week’s system design refresher:\n\n- Cloudflare vs. AWS vs. Azure\n \n- Popular Backend Tech Stack\n \n- HTTP vs. HTTPS\n \n- Forward Proxy versus Reverse Proxy\n \n- Concurrency is NOT Parallelism\n \n- SPONSOR US\n \n\n* * *\n\n## Cloudflare vs. AWS vs. Azure\n\nCloudflare is much more than just a CDN and DDoS protection service. Let’s do a quick comparison of Cloudflare, AWS, and Azure.\n\n![Image](https://substackcdn.com/image/fetch/$s_!Eyti!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F862d0649-d77b-410f-95a5-6505c9eeb15a_2250x2814.png)\n\nCloudflare has rapidly expanded beyond its traditional CDN roots, launching a suite of modern developer-first services like Workers, R2, D1, and so on. These offerings position it as a serious edge-native alternative to other cloud providers.\n\nHere are the key cloud capabilities that Cloudflare supports:\n\n1. Edge Compute and Serverless\n \n2. Object and Blob Storage\n \n3. Relational Databases\n \n4. Containers\n \n5. Sandboxes\n \n6. Workflows\n \n7. AI Agents SDK\n \n8. Vector and AI search\n \n9. Data Connectivity\n \n10. AI Infrastructure\n \n11. Content Delivery Network\n \n12. DNS\n \n13. Load Balancing\n \n\nOver to you: Have you used Cloudflare’s new offerings? What are your thoughts on them?\n\n* * *\n\n## Popular Backend Tech Stack\n\n![No alternative text description for this image](https://substackcdn.com/image/fetch/$s_!52bX!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F65613a28-2320-4bb6-a610-5ab96b13240d_800x903.jpeg)\n\n* * *\n\n## HTTP vs. HTTPS\n\n![Image](https://substackcdn.com/image/fetch/$s_!JV_9!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fa95473e0-5a68-43c6-841e-540a6b198d6d_2360x2960.png)\n\nWhen you open a website, the difference between HTTP and HTTPS decides whether your data travels safely or in plain sight. Here’s what actually happens under the hood:\n\nHTTP:\n\n- Sends data in plain text, anyone on the network can intercept it.\n \n- The client and server perform a simple TCP handshake: SYN, SYN-ACK, ACK\n \n- Fast but completely insecure. Passwords, tokens, and forms can all be read in transit.\n \n\nHTTPS (SSL/TLS):\n\n- Step 1: TCP Handshake: Standard connection setup.\n \n- Step 2: Certificate Check: Client says hello. Server responds with hello and its SSL/TLS certificate. That certificate contains the server’s public key and is signed by a trusted Certificate Authority.\n \n Your browser verifies this certificate is legitimate, not expired, and actually belongs to the domain you’re trying to reach. This proves you’re talking to the real server, not some attacker pretending to be it.\n \n- Step 3: Key Exchange: Here’s where asymmetric encryption happens. The server has a public key and a private key. Client generates a session key, encrypts it with the server’s public key, and sends it over. Only the server can decrypt this with its private key.\n \n Both sides now have the same session key that nobody else could have intercepted. This becomes the symmetric encryption key for the rest of the session.\n \n- Step 4: Data Transmission: Now every request and response gets encrypted with that session key using symmetric encryption.\n \n\nOver to you: What’s your go-to tool for debugging TLS issues, openssl, curl -v, or something else?\n\n* * *\n\n## Forward Proxy versus Reverse Proxy\n\n![](https://substackcdn.com/image/fetch/$s_!5rGo!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fac99f98d-49a7-4933-b06f-8da0901d210e_800x939.gif)\n\nA forward proxy sits between clients (users) and the internet. It acts on behalf of users, hiding their identity or filtering traffic before it reaches the external web.\n\nSome applications of a forward proxy are:\n\n1. Protect users while browsing the internet.\n \n2. Helps organizations restrict access to certain websites.\n \n3. Speeds up web browsing by caching frequently accessed content.\n \n\nA reverse proxy sits between the internet (clients) and backend servers. It acts on behalf of servers, handling incoming traffic.\n\nSome applications of a reverse proxy are:\n\n1. Distributes traffic across multiple servers to ensure no single server is overwhelmed.\n \n2. Handles SSL encryption/decryption so backend servers don’t have to.\n \n3. Helps protect backend servers from DDoS attacks.\n \n\nOver to you: What else will you add to understand forward proxy and reverse proxy?\n\n* * *\n\n## Things Every Developer Should Know: Concurrency is NOT parallelism\n\nIn system design, it is important to understand the difference between concurrency and parallelism.\n\n![](https://substackcdn.com/image/fetch/$s_!qtkE!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F4646c2e2-a6fb-44e7-a091-73fcbd8fa498_800x1040.gif)\n\nAs Rob Pyke(one of the creators of GoLang) stated:“ Concurrency is about 퐝퐞퐚퐥퐢퐧퐠 퐰퐢퐭퐡 lots of things at once. Parallelism is about 퐝퐨퐢퐧퐠 lots of things at once.” This distinction emphasizes that concurrency is more about the 퐝퐞퐬퐢퐠퐧 of a program, while parallelism is about the 퐞퐱퐞퐜퐮퐭퐢퐨퐧.\n\nConcurrency is about dealing with multiple things at once. It involves structuring a program to handle multiple tasks simultaneously, where the tasks can start, run, and complete in overlapping time periods, but not necessarily at the same instant.\n\nConcurrency is about the composition of independently executing processes and describes a program’s ability to manage multiple tasks by making progress on them without necessarily completing one before it starts another.\n\nParallelism, on the other hand, refers to the simultaneous execution of multiple computations. It is the technique of running two or more tasks or computations at the same time, utilizing multiple processors or cores within a computer to perform several operations concurrently. Parallelism requires hardware with multiple processing units, and its primary goal is to increase the throughput and computational speed of a system.\n\nIn practical terms, concurrency enables a program to remain responsive to input, perform background tasks, and handle multiple operations in a seemingly simultaneous manner, even on a single-core processor. It’s particularly useful in I/O-bound and high-latency operations where programs need to wait for external events, such as file, network, or user interactions.\n\nParallelism, with its ability to perform multiple operations at the same time, is crucial in CPU-bound tasks where computational speed and throughput are the bottlenecks. Applications that require heavy mathematical computations, data analysis, image processing, and real-time processing can significantly benefit from parallel execution.\n\n* * *\n\n## **SPONSOR US**\n\nGet your product in front of more than 1,000,000 tech professionals.\n\nOur newsletter puts your products and services directly in front of an audience that matters - hundreds of thousands of engineering leaders and senior engineers - who have influence over significant tech decisions and big purchases.\n\nSpace Fills Up Fast - Reserve Today\n\nAd spots typically sell out about 4 weeks in advance. To ensure your ad reaches this influential audience, reserve your space now by emailing**sponsorship@bytebytego.com.**","freeMarkdown","kind1EventId","kind30023EventId","4b40d50058a4d84c2e0ec79a5e800ba1b984ab862f2bc15dd407d536ab80a6f8","kind30023",{"_19":218,"_192":221,"_194":222,"_67":223,"_208":26,"_158":237,"_210":238},"70b158bce48e5f8cc385d96e5bea4e881cc7843998f13ded1bfb3bd7462bf74148de0826e01945819194135a46400268dd238e038247e8c35e5c0cba7d10f5f5",30023,[224,227,228,231,232,234,235,236],[225,226],"r","https://magda.syndichain.com/articles/80e01e51-795f-4aae-8691-c52542342c97",[32,144],[229,230],"published_at","1763829044",[34,150],[233,139],"d",[179,145],[204,205],[207,26,31],"EP190: Cloudflare vs. AWS vs. Azure\n## [Sentry, Now With Logs (Sponsored)](https://bit.ly/Sentry_112225)\n\n[](https://bit.ly/Sentry_112225)\n\nFailed checkouts, dropped jobs, timeouts that don’t even throw errors ➡️ these are the issues that slow your team down.\n\nWith Sentry Logs, you can trace every step, from the user’s request through your code to the log line. And because Logs connect automatically with your errors, traces, and even replays, all your debugging context lives in one place.\n\nTLDR: Sentry has Logs. More context, fewer tabs, faster fixes, more time shipping.\n\n[Try Sentry for Free](https://bit.ly/Sentry_112225)\n\n* * *\n\nThis week’s system design refresher:\n\n- Cloudflare vs. AWS vs. Azure\n \n- Popular Backend Tech Stack\n \n- HTTP vs. HTTPS\n \n- Forward Proxy versus Reverse Proxy\n \n- Concurrency is NOT Parallelism\n \n- SPONSOR US\n \n\n* * *\n\n## Cloudflare vs. AWS vs. Azure\n\nCloudflare is much more than just a CDN and DDoS protection service. Let’s do a quick comparison of Cloudflare, AWS, and Azure.\n\n![Image](https://substackcdn.com/image/fetch/$s_!Eyti!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F862d0649-d77b-410f-95a5-6505c9eeb15a_2250x2814.png)\n\nCloudflare has rapidly expanded beyond its traditional CDN roots, launching a suite of modern developer-first services like Workers, R2, D1, and so on. These offerings position it as a serious edge-native alternative to other cloud providers.\n\nHere are the key cloud capabilities that Cloudflare supports:\n\n1. Edge Compute and Serverless\n \n2. Object and Blob Storage\n \n3. Relational Databases\n \n4. Containers\n \n5. Sandboxes\n \n6. Workflows\n \n7. AI Agents SDK\n \n8. Vector and AI search\n \n9. Data Connectivity\n \n10. AI Infrastructure\n \n11. Content Delivery Network\n \n12. DNS\n \n13. Load Balancing\n \n\nOver to you: Have you used Cloudflare’s new offerings? What are your thoughts on them?\n\n* * *\n\n## Popular Backend Tech Stack\n\n![No alternative text description for this image](https://substackcdn.com/image/fetch/$s_!52bX!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F65613a28-2320-4bb6-a610-5ab96b13240d_800x903.jpeg)\n\n* * *\n\n## HTTP vs. HTTPS\n\n![Image](https://substackcdn.com/image/fetch/$s_!JV_9!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fa95473e0-5a68-43c6-841e-540a6b198d6d_2360x2960.png)\n\nWhen you open a website, the difference between HTTP and HTTPS decides whether your data travels safely or in plain sight. Here’s what actually happens under the hood:\n\nHTTP:\n\n- Sends data in plain text, anyone on the network can intercept it.\n \n- The client and server perform a simple TCP handshake: SYN, SYN-ACK, ACK\n \n- Fast but completely insecure. Passwords, tokens, and forms can all be read in transit.\n \n\nHTTPS (SSL/TLS):\n\n- Step 1: TCP Handshake: Standard connection setup.\n \n- Step 2: Certificate Check: Client says hello. Server responds with hello and its SSL/TLS certificate. That certificate contains the server’s public key and is signed by a trusted Certificate Authority.\n \n Your browser verifies this certificate is legitimate, not expired, and actually belongs to the domain you’re trying to reach. This proves you’re talking to the real server, not some attacker pretending to be it.\n \n- Step 3: Key Exchange: Here’s where asymmetric encryption happens. The server has a public key and a private key. Client generates a session key, encrypts it with the server’s public key, and sends it over. Only the server can decrypt this with its private key.\n \n Both sides now have the same session key that nobody else could have intercepted. This becomes the symmetric encryption key for the rest of the session.\n \n- Step 4: Data Transmission: Now every request and response gets encrypted with that session key using symmetric encryption.\n \n\nOver to you: What’s your go-to tool for debugging TLS issues, openssl, curl -v, or something else?\n\n* * *\n\n## Forward Proxy versus Reverse Proxy\n\n![](https://substackcdn.com/image/fetch/$s_!5rGo!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fac99f98d-49a7-4933-b06f-8da0901d210e_800x939.gif)\n\nA forward proxy sits between clients (users) and the internet. It acts on behalf of users, hiding their identity or filtering traffic before it reaches the external web.\n\nSome applications of a forward proxy are:\n\n1. Protect users while browsing the internet.\n \n2. Helps organizations restrict access to certain websites.\n \n3. Speeds up web browsing by caching frequently accessed content.\n \n\nA reverse proxy sits between the internet (clients) and backend servers. It acts on behalf of servers, handling incoming traffic.\n\nSome applications of a reverse proxy are:\n\n1. Distributes traffic across multiple servers to ensure no single server is overwhelmed.\n \n2. Handles SSL encryption/decryption so backend servers don’t have to.\n \n3. Helps protect backend servers from DDoS attacks.\n \n\nOver to you: What else will you add to understand forward proxy and reverse proxy?\n\n* * *\n\n## Things Every Developer Should Know: Concurrency is NOT parallelism\n\nIn system design, it is important to understand the difference between concurrency and parallelism.\n\n![](https://substackcdn.com/image/fetch/$s_!qtkE!,w_1456,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F4646c2e2-a6fb-44e7-a091-73fcbd8fa498_800x1040.gif)\n\nAs Rob Pyke(one of the creators of GoLang) stated:“ Concurrency is about 퐝퐞퐚퐥퐢퐧퐠 퐰퐢퐭퐡 lots of things at once. Parallelism is about 퐝퐨퐢퐧퐠 lots of things at once.” This distinction emphasizes that concurrency is more about the 퐝퐞퐬퐢퐠퐧 of a program, while parallelism is about the 퐞퐱퐞퐜퐮퐭퐢퐨퐧.\n\nConcurrency is about dealing with multiple things at once. It involves structuring a program to handle multiple tasks simultaneously, where the tasks can start, run, and complete in overlapping time periods, but not necessarily at the same instant.\n\nConcurrency is about the composition of independently executing processes and describes a program’s ability to manage multiple tasks by making progress on them without necessarily completing one before it starts another.\n\nParallelism, on the other hand, refers to the simultaneous execution of multiple computations. It is the technique of running two or more tasks or computations at the same time, utilizing multiple processors or cores within a computer to perform several operations concurrently. Parallelism requires hardware with multiple processing units, and its primary goal is to increase the throughput and computational speed of a system.\n\nIn practical terms, concurrency enables a program to remain responsive to input, perform background tasks, and handle multiple operations in a seemingly simultaneous manner, even on a single-core processor. It’s particularly useful in I/O-bound and high-latency operations where programs need to wait for external events, such as file, network, or user interactions.\n\nParallelism, with its ability to perform multiple operations at the same time, is crucial in CPU-bound tasks where computational speed and throughput are the bottlenecks. Applications that require heavy mathematical computations, data analysis, image processing, and real-time processing can significantly benefit from parallel execution.\n\n* * *\n\n## **SPONSOR US**\n\nGet your product in front of more than 1,000,000 tech professionals.\n\nOur newsletter puts your products and services directly in front of an audience that matters - hundreds of thousands of engineering leaders and senior engineers - who have influence over significant tech decisions and big purchases.\n\nSpace Fills Up Fast - Reserve Today\n\nAd spots typically sell out about 4 weeks in advance. To ensure your ad reaches this influential audience, reserve your space now by emailing**sponsorship@bytebytego.com.**\n https://magda.syndichain.com/articles/80e01e51-795f-4aae-8691-c52542342c97 magda magda magda magda",1763829044,"publishedToNostr","htmlContentKind30023","