When I am starting a react app by "npm start" command in VScode terminal, it starts to loading forever on the browser. I am completely new to that so I have no idea what and where could go wrong. I have read that it may be because of mistakes in code so I deleted all the things which caused "compiled with warnings", but even though now terminal says "compiled successfully", nothing changed. In the browser it is stuck on loading...
Note that the development build is not optimized. To create a product build, use npm run build.
Does it have something to do with a problem? Looking forward to understand better what is going on. Thanks!
Update: so I loaded an index.html file through live server extension in vscode and opened up developer tools and I saw a bunch of problems, which are all referring to a syntax error in the very beginning of the initial htmls code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="theme-color" content="#000000" />
<meta
name="description"
content="Web site created using create-react-app"
/>
That is what I see on dev tools:
Also, I tried "git status" in git bash and I see "nothing added to commit but untracked files present (use "git add" to track)" and it lists ALL of the files from my user folder.
Important note: earlier it was all fine and never have I ever seen all of these folders in a bash after running git status. Plus, I was even able to render react app.
I accidentally deleted the package.json. Restoring it solved my problem.
the main problem are:
You create an infinite Component, nesting the parent component in the parent component
https://i.stack.imgur.com/ngl1s.png
You import the wrong Component path so that it creates a nesting Component
double-check your path is exactly correct
or check by Comment your code, circling the Component that makes an error then fixing it
so if you can't solve it remember your Component is nesting, then it makes infinite localhost loading
I solved by myself
I learn Reactjs and read somewhere about this but cant find it now. how
to make the browser updated download the app files.
Again typically after a new release has been published?
Cache-control?
Like when I build a new version 1.0.1 and then next time 1.0.2 and then the browser should detect this and re download the changed files into browser cache.
Is there such thing?
UPDATE
here is my index.html with some Cache-control that dont work correctly
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, user-scalable=0" />
<meta http-equiv='cache-control' content='no-cache'>
<meta http-equiv='expires' content='0'>
<meta http-equiv='pragma' content='no-cache'>
..........
That functionality is built right into the HTTP protocol, but it works based on timestamps, not on versions.
With the HTTP request for your app's script, the browser sends along a timestamp of the cached version.
If that version is newer than the version on the server (i. e. it is up to date), the server replies with HTTP 304 Not Modified, and an empty body.
If the browser's version is out-of-date, the server will instead reply with HTTP 200 OK and the actual script.
(Note that this is subject to browser and server configuration, but this is how it is supposed to work, and usually does.)
My problem is Crawl in Google Search Console can't found sub-routes in React.
The URL is https://huynhsamha.github.io/crypto, and crawler can fetch and render homepage (route /) and static files such as /robots.txt, /favicon.ico, but it can't found the sub-routes, which are rendered by React, (SPA, using Redux), such as /algorithm/sha256. Example, https://huynhsamha.github.io/crypto/algorithm/sha256 can't found by Crawler but it can be accessible.
This is my screenshot in Google Search Console I've tried.
Who can explain why and how to fix my problem? I'm using react-router-dom with react-redux My repository on github here
Edit 1
I've also tried the answer https://stackoverflow.com/a/53966338/8828489 in this question, but not working. I've added script in index.html (https://github.com/huynhsamha/crypto/blob/gh-pages/index.html), but search console can't still found, so it also can't render any error on screen.
Edit 2
I've also tried the answers https://stackoverflow.com/a/54040745/8828489 and https://stackoverflow.com/a/54048119/8828489 in this question, but not working. I've created 404.html file and add scripts as the answer instructs but it didn't also work.
Edit 3
I've also tried the answer https://stackoverflow.com/a/54044148/8828489 in this question by creating a simple sitemap.xml, googlebot can find this file and discover all URLs I defined in sitemap. But it also cannot fetch and render URLs mentioned.
I found that when i opened https://huynhsamha.github.io/crypto/algorithm/sha256, I actually received a 404 as a response. I think your workaround for hosting SPA on GitHub using the 404.html is the issue here. While us humans see your app being served on our browser correctly, googlebot doesn't care and just look at the response code and see that it has received a 404. You'll need a different workaround that doesn't involves using the 404.html as the entry point to your app directly.
Try following this workaround by rafrex instead, it redirects the browser to index.html using the 404.html while keeping the original route, it claims that googlebot register that as a 301 instead of a 404, for your case that means adding these changes below to your site, pay attention to the script below the <!-- ------Single Page Apps GitHub Pages Workaround------ -->:
<!-- 404.html -->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Cryptography</title>
<!-- ------Single Page Apps GitHub Pages Workaround------ -->
<script type="text/javascript">
// Single Page Apps for GitHub Pages
// https://github.com/rafrex/spa-github-pages
// Copyright (c) 2016 Rafael Pedicini, licensed under the MIT License
// ----------------------------------------------------------------------
// This script takes the current url and converts the path and query
// string into just a query string, and then redirects the browser
// to the new url with only a query string and hash fragment,
// e.g. http://www.foo.tld/one/two?a=b&c=d#qwe, becomes
// http://www.foo.tld/?p=/one/two&q=a=b~and~c=d#qwe
// Note: this 404.html file must be at least 512 bytes for it to work
// with Internet Explorer (it is currently > 512 bytes)
// If you're creating a Project Pages site and NOT using a custom domain,
// then set segmentCount to 1 (enterprise users may need to set it to > 1).
// This way the code will only replace the route part of the path, and not
// the real directory in which the app resides, for example:
// https://username.github.io/repo-name/one/two?a=b&c=d#qwe becomes
// https://username.github.io/repo-name/?p=/one/two&q=a=b~and~c=d#qwe
// Otherwise, leave segmentCount as 0.
var segmentCount = 1;
var l = window.location;
l.replace(
l.protocol + '//' + l.hostname + (l.port ? ':' + l.port : '') +
l.pathname.split('/').slice(0, 1 + segmentCount).join('/') + '/?p=/' +
l.pathname.slice(1).split('/').slice(segmentCount).join('/').replace(/&/g, '~and~') +
(l.search ? '&q=' + l.search.slice(1).replace(/&/g, '~and~') : '') +
l.hash
);
</script>
</head>
<body>
</body>
</html>
<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="theme-color" content="#000000">
<meta name="description" content="Cryptography Algorithms: Secure Hash Algorithm (sha256, sha512, ...), Message Digest Algorithm (md5, ripemd160), HMAC-SHA, HMAC-MD, pbkdf2, Advanced Encryption Standard (AES), Triple Data Encryption Standard, (TripleDES, DES), RC4, Rabbit, ...">
<meta name="keywords" content="crypto, algorithms, secure hash, sha, sha512, sha256, message digest, md5, hmac-sha, aes, des, tripledes, pbkdf2, rc4, rabbit, encryption, descryption">
<meta name="author" content="huynhsamha">
<!-- Open Graph -->
<meta property="fb:app_id" content="440168923127908">
<meta property="og:url" content="https://huynhsamha.github.io/crypto">
<meta property="og:title" content="Cryptography Algorithms">
<meta property="og:description" content="Cryptography Algorithms: Secure Hash Algorithm (sha256, sha512, ...), Message Digest Algorithm (md5, ripemd160), HMAC-SHA, HMAC-MD, pbkdf2, Advanced Encryption Standard (AES), Triple Data Encryption Standard, (TripleDES, DES), RC4, Rabbit, ...">
<meta property="og:type" content="website">
<meta property="og:image" content="%PUBLIC_URL%/img/main.jpeg">
<meta property="og:site_name" content="Cryptography">
<meta property="og:locale" content="vi_VN">
<!-- Twitter Card -->
<meta name="twitter:card" content="summary">
<meta name="twitter:site" content="#huynhsamha">
<meta name="twitter:creator" content="#huynhsamha">
<meta name="twitter:url" content="https://huynhsamha.github.io/crypto">
<meta name="twitter:title" content="Cryptography Algorithms">
<meta name="twitter:description" content="Cryptography Algorithms: Secure Hash Algorithm (sha256, sha512, ...), Message Digest Algorithm (md5, ripemd160), HMAC-SHA, HMAC-MD, pbkdf2, Advanced Encryption Standard (AES), Triple Data Encryption Standard, (TripleDES, DES), RC4, Rabbit, ...">
<meta name="twitter:image:src" content="%PUBLIC_URL%/img/main.jpeg">
<!--
manifest.json provides metadata used when your web app is added to the
homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
-->
<link rel="manifest" href="%PUBLIC_URL%/manifest.json">
<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
<link rel="author" href="//github.com/huynhsamha">
<link rel="canonical" href="//huynhsamha.github.io/crypto">
<!--
Notice the use of %PUBLIC_URL% in the tags above.
It will be replaced with the URL of the `public` folder during the build.
Only files inside the `public` folder can be referenced from the HTML.
Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
work correctly both with client-side routing and a non-root public URL.
Learn how to configure a non-root public URL by running `npm run build`.
-->
<link href="//fonts.googleapis.com/css?family=Open+Sans:400,600,700&subset=vietnamese" rel="stylesheet">
<link rel="stylesheet" href="%PUBLIC_URL%/css/bootstrap.min.css">
<link rel="stylesheet" href="%PUBLIC_URL%/lib/font-awesome/css/font-awesome.min.css">
<!-- ------Single Page Apps GitHub Pages Workaround------ -->
<script type="text/javascript">
// Single Page Apps for GitHub Pages
// https://github.com/rafrex/spa-github-pages
// Copyright (c) 2016 Rafael Pedicini, licensed under the MIT License
// ----------------------------------------------------------------------
// This script checks to see if a redirect is present in the query string
// and converts it back into the correct url and adds it to the
// browser's history using window.history.replaceState(...),
// which won't cause the browser to attempt to load the new url.
// When the single page app is loaded further down in this file,
// the correct url will be waiting in the browser's history for
// the single page app to route accordingly.
(function(l) {
if (l.search) {
var q = {};
l.search.slice(1).split('&').forEach(function(v) {
var a = v.split('=');
q[a[0]] = a.slice(1).join('=').replace(/~and~/g, '&');
});
if (q.p !== undefined) {
window.history.replaceState(null, null,
l.pathname.slice(0, -1) + (q.p || '') +
(q.q ? ('?' + q.q) : '') +
l.hash
);
}
}
}(window.location))
</script>
<title>Cryptography</title>
</head>
<body>
<noscript>
You need to enable JavaScript to run this app.
</noscript>
<div id="root"></div>
<!--
This HTML file is a template.
If you open it directly in the browser, you will see an empty page.
You can add webfonts, meta tags, or analytics to this file.
The build step will place the bundled scripts into the <body> tag.
To begin the development, run `npm start` or `yarn start`.
To create a production bundle, use `npm run build` or `yarn build`.
-->
<script src="%PUBLIC_URL%/js/jquery-3.3.1.slim.min.js" type="text/javascript"></script>
<script src="%PUBLIC_URL%/js/popper.min.js" type="text/javascript"></script>
<script src="%PUBLIC_URL%/js/bootstrap.min.js" type="text/javascript"></script>
<!-- Google Adsense -->
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
</body>
</html>
More info and discussions on GitHub's support for single page app here.
I poked around in your source code and don't see anything alarming; however, I found a few posts about similar issues (1) (2). The second seems particularly helpful, so I'll repeat it here. Shout out to #Zerotorescue on Reddit.
Open Google Search Console and go to Crawl -> Fetch as Google and do a fetch and render.
Add this to your site, either as a part of tag in your HTML file or as part of the bundle:
https://gist.github.com/mstijak/715fa2dd3f495a98386c3ebbadbabb8c
I recommend the former since that makes it easier to change if you need to make it more readable (no need to recompile your app).
Push this to your site and then do another fetch and display. The error preventing Google from running your app will now show. The search console resolution is pretty low so you may have to increase the font-size of the error and fetch again. Don't worry, Google doesn't mind repeated calls.
You'll probably find that Google's crawler can't process your code because you're using some ES6 feature it doesn't support. You can fix this by polyfilling. I've tried a couple of things such as https://polyfill.io/ which turned out to not really support Googlebot and while it might sometimes work, it is pretty unreliable. Instead I recommend using babel-polyfill. It will increase your bundle size a little bit for everyone but in my experience it provides the widest browser support with a minimal headache. Just turn it on and you're done.
If you're using create-react-app this is the polyfills.js file I use that you could copy:
https://github.com/WoWAnalyzer/WoWAnalyzer/blob/2c67a970f8bd9026fa816d31201c42eb860fe2a3/config/polyfills.js#L1
Notice there are a lot of comments explaining all the issues the polyfill service introduce that you won't have to deal with if you use babel-polyfill.
Because, react app is onepage web, You need a sitemap file, you can find it how to make a one here ,too make a 404 page, and every route add property that has a anchor
like to
<a title="This my Route One" href="https://myreactapp/routeOne" alt="Route One"/>
The problem is that you're using a 404 page to capture incoming traffic to routes other than /. This means those routes serve a 404 status code (you can see this if you open Network in dev tools and try to visit one of those deep URLs). Google sees a 404 status in the response header and just gives up right away. You probably noticed that the "Not Found" message in Webmaster Tools popped up super-fast.
On a normal server, you would capture those routes and return a successful status code like 200 or 301 and Google would continue crawling. However, because you're using GitHub pages, you need to hack your way around it.
You should be able to do this by setting up an instant redirect from that 404 template to your index template. Browsers interpret instant redirects as 301s. To do this, replace the contents of your 404.html with something like this:
<html>
<head>
<script>
sessionStorage.redirect = location.href; // we'll use this later
</script>
<meta http-equiv="refresh" content="0;URL='/crypto'">
</head>
<body></body>
</html>
Just make sure the file-size of that 404.html is greater than 512b or IE will discard it (damn M$...).
Lastly, you'll need to make sure your index.html captures the original route. To do so, use a script like this in the head of your index.html:
<script>
(function(){
var redirect = sessionStorage.redirect; // remember me?
delete sessionStorage.redirect;
if (redirect && redirect != location.href) {
history.replaceState(null, null, redirect);
}
})();
</script>
For reference, I stole this clever hack from:
https://www.smashingmagazine.com/2016/08/sghpa-single-page-app-hack-github-pages/
I also, do not see anything alarming in your code (although I don't think you need the baseUrl in your <Route /> - though I could be wrong, and don't think that's the issue, but it may be worth eliminating if unnecessary).
Just a guess but looking at the networks tab as I bounced around the links, I noticed the service worker. I am, admittedly, not super savvy when it comes to service workers (yet!), however googling a bit revealed that google crawlers do not yet support service workers as asserted in this article, this article, and by google.... I also noticed that if I run a Lighthouse test on one of the links I reached via in-app navigation (for instance I click on the /algorithm tab from the nav on the homepage and then run a Lighthouse test) I get the following errors:
There were issues affecting this run of Lighthouse: Chrome extensions
negatively affected this page's load performance. Try auditing the
page in incognito mode or from a Chrome profile without extensions.
and more interesting:
Lighthouse was unable to reliably load the page you requested. Make
sure you are testing the correct URL and that the server is properly
responding to all requests. Status code: 404.
...despite clearly seeing it rendered in the browser. Seems suspect. So, if that is part of how navigation is happening (seems it likely is based on the registerServiceWorker.js file in your repo lol), it may be the cause of your links not being found/followed.
This questions is pretty specific to the react-starter-kit, though, someone else may be able to help here on the internets. I am trying to use the react-starter-kit with a flask application I am developing. I chose this yeoman generator as it had a lot of things I am looking for, though, I don't want to run on a node server. I have a flask app that I would just like to wire up to the react front end. I can't quite figure out how the node routes know which .js bundled file to include (and Node routes are a bit confounding to me anyways). Where would be the best place to start here?
I think if I could start with a specific question, to what .js file could I have an index.html point to? Or how can I find that?
I am tentative to ask this question here, but I hopefully will be directed to the right place.
Here is my index.html:
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>Flask React</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- styles -->
</head>
<body>
<div id="app"></div>
<!-- scripts -->
<script type="text/js" src="build/assets.js"></script>
</body>
</html>
Here is my flask view:
#CORE.route('/', methods=['GET'])
def index():
return render_template('index.html')
Here is the build/assets.js
module.exports = {"main":{"js":"/main.js?032d72b634c91d2f8756"}};
Where the /main.js?{{string}} points the that bundled version of the app.
Here is the file directory layout:
App
|-app
|-Core
|-view.py
|-Templates
|-index.html
|-build
|-assets.js
|-src
What I have decided to do, and what I would recommend doing, is to use Graphene and Flask-GraphQL alongside the react-starter-kit. Then to get to my data I can just have the node server query to the flask server to get the data from postgres. This will allow me to still to data-y things in python with the flask server and produce a RESTful API if needed, but will allow me to benefit from the awesomeness of GraphQL.
I am still getting everything figured out, and I will come back to repost in the future when I get things working all the way.
I am using servereless to deploy me backend and front end. My front end is using create react app. I believe after I made the following changes
<img className="svg-width" src="/img/Icons/photographer-camera.svg" alt="camera icon" />
<img className="svg-width" src="/img/icons/photographer-camera.svg" alt="camera icon" />
Where I changed Icons/ to icons/ I get the following issue:
Uncaught SyntaxError: Unexpected token <
In my s3 bucket I navigate to img/ and verify that my directory is also lowercase for icons.
The file in question of the syntax error is main.977eb738.js under /static/js/main.977eb738.js of my domain. But when I go to my bucket I don't see that js file. I see
The code in the file its complaining about is the index.html in public/index.html in the create react app boilerplate.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="theme-color" content="#000000">
<script src="https://maps.googleapis.com/maps/api/js?key=MY_KEY&libraries=places"></script>
<script src="https://js.stripe.com/v3/"></script>
</head>
<body>
<noscript>
You need to enable JavaScript to run this app.
</noscript>
<div id="root"></div>
</body>
</html>
One more thing to note is this works fine locally and even on mobile. I thought this could be cloudfront caching so I waited a full day and still cannot get to the bottom of this error.
I ran into the same issue. I tested incognito and the site worked fine in inco after doing a cache invalidation the same way that Michael stated in the first comment. It looks like it is browser caching alongside the Cloudfront caching.
I was able to resolve the issue by clearing browser cookies/data from the last day.
I would recomend anyone who is uploading directly to AWS S3 bucket to clear the CloudFront edge cache.
Using AWS CLI this can be done with the folowing line:
aws cloudfront create-invalidation --distribution-id YOURID --paths "/*"
In order to find the CloudFront Distribution Id navigate to cloudFront in AWS console.
Read more here: Invalidating Files
In my case, my CloudFront distribution was blocking access to all /static/* files. Creating a CF behavior that whitelisted that path resolved the issue.
I faced a similar issue. I wasn't using serverless(AWS lambda).
What was happening was that inside my build/index.html somehow it was failing at the link's hrefs, and script's src tag.
So, I had <link href="/static/css/main.866f5359.chunk.css" rel="stylesheet"> and I changed it to
<link href="https://s3-us-west-2.amazonaws.com/fullthrottle-labs-react-task/static/css/main.866f5359.chunk.css" rel="stylesheet">, similarly for scripts as well.
So, instead of giving relative paths in build/index.html, giving an absolute path did the trick for me.