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HOW TO USE S3 PUT SIGNED URLS HOW TO ADD TIMEOUT TO A PROMISE IN JAVASCRIPT The solution is to add a third argument that is the timeout rejection value. This way there is an option to differentiate between errors: const timeout = (prom, time, exception) => { let timer; return Promise.race( ).finally( () => clearTimeout(timer)); } WHAT IS CNAME FLATTENING AND HOW IT HELPS REDIRECTING THE The primary purpose of DNS is to translate a domain name to an IP address. It works by sending back an A record with the IP so that the client knows where to connect. This works great when you have a server with a fixed IP that hosts your website. The browser contacts the name server, gets the IP, then downloads the page from your server. HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FOREACH INSEE MORE ONADVANCEDWEB.HU
HOW TO USE S3 POST SIGNED URLS HOW TO USE UNIQUE RESOURCE NAMES WITH TERRAFORM WHEN TO USE LET'S ENCRYPT'S WEBROOT AND STANDALONESEE MORE ONADVANCEDWEB.HU
HOW TO USE ASYNC FUNCTIONS WITH ARRAY.MAP IN JAVASCRIPT Parallel processing. Another type of concurrency control is to run at most n tasks in parallel, and start a new one whenever one is finished.. Controlled concurrency map map e1 e1 e2 e2 e3 e3 e4 e4. I couldn’t come up with a simple implementation for this, but fortunately, the Bluebird library provides one out of the box. This makes it straightforward, just import the library and use the HOW TO USE ASYNC/AWAIT WITH POSTMESSAGE HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FILTER IN JAVASCRIPT Async filter with map. The async version is a bit more complicated this time and it works in two phases. The first one maps the arraythrough the
HOW TO USE S3 PUT SIGNED URLS HOW TO ADD TIMEOUT TO A PROMISE IN JAVASCRIPT The solution is to add a third argument that is the timeout rejection value. This way there is an option to differentiate between errors: const timeout = (prom, time, exception) => { let timer; return Promise.race( ).finally( () => clearTimeout(timer)); } WHAT IS CNAME FLATTENING AND HOW IT HELPS REDIRECTING THE The primary purpose of DNS is to translate a domain name to an IP address. It works by sending back an A record with the IP so that the client knows where to connect. This works great when you have a server with a fixed IP that hosts your website. The browser contacts the name server, gets the IP, then downloads the page from your server. HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FOREACH INSEE MORE ONADVANCEDWEB.HU
HOW TO USE S3 POST SIGNED URLS HOW TO USE UNIQUE RESOURCE NAMES WITH TERRAFORM WHEN TO USE LET'S ENCRYPT'S WEBROOT AND STANDALONESEE MORE ONADVANCEDWEB.HU
INTRODUCING: AWS IAM MASTERCLASS VIDEO COURSE Learn how to configure access control in AWS. I’m excited to announce my third video course! This time the topic is AWS IAM and the course roughly covers the same concepts as the AWS IAM guide, but in a video format that includes screencast videos and other visual elements that are not possible in a written format.. Get the course with a (time-limited) discount here. WHAT IS CNAME FLATTENING AND HOW IT HELPS REDIRECTING THE The primary purpose of DNS is to translate a domain name to an IP address. It works by sending back an A record with the IP so that the client knows where to connect. This works great when you have a server with a fixed IP that hosts your website. The browser contacts the name server, gets the IP, then downloads the page from your server. HOW TO USE CLOUDFRONT FUNCTIONS TO CHANGE THE ORIGIN Up until now, CloudFront supported only one way to run arbitrary code on the edge. It is Lambda@Edge and with it, you can associate Lambda functions with CloudFront cache behaviors and these are called whenever a request is made to/from the CDN. HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FOREACH IN How to iterate over the elements asynchronously. Async forEach, sequential processing js js reduce reduce e1 e1 e2 e2 e3 e3 1 2 3 Finished async. This way the elements are processed in-order, one after the other, and the program execution waits for the whole array to finish before moving on. HOW TO USE S3 POST SIGNED URLS The process consists of 2 steps, first the backend signs a URL and sends it to the client then the client uploads directly to S3. In the case of the JS SDK, the function that returns the signed URL is s3.createPresignedPost. It returns an object with a url HOW TO SOLVE CORS PROBLEMS WHEN REDIRECTING TO S3 SIGNED First, there is a request to the backend, asking to sign an S3 URL. Then a separate request is sent to the bucket to fetch the file. 2-phase fetch Frontend Frontend API API S3 S3 1) request file check access and sign URL signed URL 2) fetch file file. When I implement a solution like this, I always have a strange feeling that something isnot
HOW TO USE ASYNC FUNCTIONS WITH ARRAY.REDUCE IN JAVASCRIPT Asynchronous reduce. An async version is almost the same, but it returns a Promise on each iteration, so memo will be the Promise of the previous result. The iteratee function needs to await it in order to calculate the next result: // utility function for sleeping const sleep = (n) => new Promise( (res) => setTimeout(res, n)); const arr =[1
WHEN TO USE LET'S ENCRYPT'S WEBROOT AND STANDALONE Probably the two most used custom authorizations when it comes to Let’s Encrypt is the webroot and the standalone. The former is the preferred in many scenarios, but knowing when it falls short is essential when you analyze your requirements. But knowing about the latter makes some setups far easier to implement, and also to tacklesome
AWS: HOW TO GET NOTIFIED ON IAM USER LOGINS Step 3: Add a Metric Filter. Now that CloudTrail events are delivered to CloudWatch logs, the next step is to set up a Metric filter. This is an expression that creates a numeric metric in CloudWatch. To do it, go to the CloudWatch Logs console, find the logs group CloudTrail is using, and on the Metric Filter column, click on the 0 filters. THE DIFFERENCES BETWEEN S3 AND CLOUDFRONT SIGNED URLS In CloudFront, a signed URL allow access to a path. Therefore, if the user has a valid signature, he can access it, no matter the origin. In S3, a signed URL issue a request as the signer user. When you sign a request, you need to provide IAM credentials, so accessing a signed URL has the same effect as that user would have done it. WHAT IS CNAME FLATTENING AND HOW IT HELPS REDIRECTING THE The primary purpose of DNS is to translate a domain name to an IP address. It works by sending back an A record with the IP so that the client knows where to connect. This works great when you have a server with a fixed IP that hosts your website. The browser contacts the name server, gets the IP, then downloads the page from your server. HOW TO USE ASYNC FUNCTIONS WITH ARRAY.MAP IN JAVASCRIPT Parallel processing. Another type of concurrency control is to run at most n tasks in parallel, and start a new one whenever one is finished.. Controlled concurrency map map e1 e1 e2 e2 e3 e3 e4 e4. I couldn’t come up with a simple implementation for this, but fortunately, the Bluebird library provides one out of the box. This makes it straightforward, just import the library and use the HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FILTER IN JAVASCRIPT Async filter with map. The async version is a bit more complicated this time and it works in two phases. The first one maps the arraythrough the
HOW TO USE ASYNC/AWAIT WITH POSTMESSAGE HOW TO ADD TIMEOUT TO A PROMISE IN JAVASCRIPT The solution is to add a third argument that is the timeout rejection value. This way there is an option to differentiate between errors: const timeout = (prom, time, exception) => { let timer; return Promise.race( ).finally( () => clearTimeout(timer)); } HOW TO USE S3 PUT SIGNED URLS HOW TO USE S3 POST SIGNED URLS HOW TO USE LET'S ENCRYPT WITH NODE.JS AND EXPRESS The --keep-until-expiring flag instructs certbot to keep the certificate if it is not near expiry. Usually, this is the right choice, as it prevents multiple restarts to use up your quota. But if you want to make sure that after every restart you have a new certificate, use --force-renewal instead. I don’t recommend it though, as you might easily find yourself rate-limited. HOW TO USE UNIQUE RESOURCE NAMES WITH TERRAFORM HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FOREACH INSEE MORE ONADVANCEDWEB.HU
WHAT IS CNAME FLATTENING AND HOW IT HELPS REDIRECTING THE The primary purpose of DNS is to translate a domain name to an IP address. It works by sending back an A record with the IP so that the client knows where to connect. This works great when you have a server with a fixed IP that hosts your website. The browser contacts the name server, gets the IP, then downloads the page from your server. HOW TO USE ASYNC FUNCTIONS WITH ARRAY.MAP IN JAVASCRIPT Parallel processing. Another type of concurrency control is to run at most n tasks in parallel, and start a new one whenever one is finished.. Controlled concurrency map map e1 e1 e2 e2 e3 e3 e4 e4. I couldn’t come up with a simple implementation for this, but fortunately, the Bluebird library provides one out of the box. This makes it straightforward, just import the library and use the HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FILTER IN JAVASCRIPT Async filter with map. The async version is a bit more complicated this time and it works in two phases. The first one maps the arraythrough the
HOW TO USE ASYNC/AWAIT WITH POSTMESSAGE HOW TO ADD TIMEOUT TO A PROMISE IN JAVASCRIPT The solution is to add a third argument that is the timeout rejection value. This way there is an option to differentiate between errors: const timeout = (prom, time, exception) => { let timer; return Promise.race( ).finally( () => clearTimeout(timer)); } HOW TO USE S3 PUT SIGNED URLS HOW TO USE S3 POST SIGNED URLS HOW TO USE LET'S ENCRYPT WITH NODE.JS AND EXPRESS The --keep-until-expiring flag instructs certbot to keep the certificate if it is not near expiry. Usually, this is the right choice, as it prevents multiple restarts to use up your quota. But if you want to make sure that after every restart you have a new certificate, use --force-renewal instead. I don’t recommend it though, as you might easily find yourself rate-limited. HOW TO USE UNIQUE RESOURCE NAMES WITH TERRAFORM HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FOREACH INSEE MORE ONADVANCEDWEB.HU
WHAT IS CNAME FLATTENING AND HOW IT HELPS REDIRECTING THE The primary purpose of DNS is to translate a domain name to an IP address. It works by sending back an A record with the IP so that the client knows where to connect. This works great when you have a server with a fixed IP that hosts your website. The browser contacts the name server, gets the IP, then downloads the page from your server. HOW TO USE ASYNC/AWAIT WITH POSTMESSAGE Cross-context communication with postMessage. The postMessage call allows an asynchronous communication channel between different browsing contexts, such as with IFrames and web workers, where direct function calls don’t work. It works by sending a message to the other side, then the receiving end can listen to message events.. For example, the page can communicate with an HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FILTER IN JAVASCRIPT Async filter with map. The async version is a bit more complicated this time and it works in two phases. The first one maps the arraythrough the
HOW TO USE S3 POST SIGNED URLS The process consists of 2 steps, first the backend signs a URL and sends it to the client then the client uploads directly to S3. In the case of the JS SDK, the function that returns the signed URL is s3.createPresignedPost. It returns an object with a url HOW TO SOLVE CORS PROBLEMS WHEN REDIRECTING TO S3 SIGNED First, there is a request to the backend, asking to sign an S3 URL. Then a separate request is sent to the bucket to fetch the file. 2-phase fetch Frontend Frontend API API S3 S3 1) request file check access and sign URL signed URL 2) fetch file file. When I implement a solution like this, I always have a strange feeling that something isnot
HOW TO USE ASYNC FUNCTIONS WITH ARRAY.SOME AND EVERY IN The some and every functions. These functions get an iteratee function, just like the filter, but they return a single true/false, depending on whether the predicate returned a specific value.In the case of the some, if any of the predicates returned true, the result will be true. For the every function, if any returned false, the result will be false. HOW TO USE ASYNC FUNCTIONS WITH ARRAY.FOREACH IN How to iterate over the elements asynchronously. Async forEach, sequential processing js js reduce reduce e1 e1 e2 e2 e3 e3 1 2 3 Finished async. This way the elements are processed in-order, one after the other, and the program execution waits for the whole array to finish before moving on. WHEN TO USE LET'S ENCRYPT'S WEBROOT AND STANDALONE Probably the two most used custom authorizations when it comes to Let’s Encrypt is the webroot and the standalone. The former is the preferred in many scenarios, but knowing when it falls short is essential when you analyze your requirements. But knowing about the latter makes some setups far easier to implement, and also to tacklesome
HOW TO USE ASYNC FUNCTIONS WITH ARRAY.REDUCE IN JAVASCRIPT Asynchronous reduce. An async version is almost the same, but it returns a Promise on each iteration, so memo will be the Promise of the previous result. The iteratee function needs to await it in order to calculate the next result: // utility function for sleeping const sleep = (n) => new Promise( (res) => setTimeout(res, n)); const arr =[1
AWS: HOW TO GET NOTIFIED ON ROOT ACCOUNT LOGIN Step 1: Set up an SNS topic. First, switch to the us-east-1 region before doing anything else. Then create an SNS topic, subscribe to it, then confirm the subscription. Unfortunately, the default topic policy does not allow CloudWatch Events to publish to the Learn S3 signed URLs from our free email-based course ×__
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