spas | Super Proxy Asset Server | REST library
kandi X-RAY | spas Summary
kandi X-RAY | spas Summary
Super Proxy Asset Server. spas is a pragmatic tool for bundling multiple API requests into a single request/response for the browser. If you have a webpage that talks to Twitter, Flickr, YouTube, etc., spas can make it better. spas throttles, caches, parses, concatenates and minifies API responses and serves them all up in one tidy little package for the browser. Every web site that hits multiple API's from the client should be doing this... Almost none are.
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QUESTION
After submitting the Stripe payment form (hosted on their server), a redirect happens to my React SPA that launched it. It reloads the entire SPA, losing all state. I'm using React Router and the return address I've set up is a particular Route. How can I prevent it from losing all state?
The same problem happens when clicking the Cancel in the form, or hitting the back button.
Sure I can store the state on the server before launching the payments page, and then retrieving it later, but that's a lot of extra work.
I think this must be a common problem with SPAs, but I haven't found an easy solution.
...ANSWER
Answered 2021-Jun-09 at 03:18If your state is only in memory, I would expect to lose it. To keep it around, you need to save it somewhere to be reloaded when the user comes back to your site. Local storage is a good option.
If you are using redux for state management, for example, you can use redux-persist to save & load your redux store in local storage.
QUESTION
I am trying to implement a simple dataclass that just holds a few parameters.
...ANSWER
Answered 2021-Jun-03 at 21:04The dataclass field and the property cannot have the same name. But you can add a leading underscore to the field, then the property will work.
QUESTION
I have a number of applications that authenticate users through single sign-on (SSO) with Auth0. One of these is an ASP.NET Core MVC application, which uses the ASP.NET Core OpenID Connect (OIDC) middleware. The single sign-on works fine. For single sign-out from the current app, I'm calling Auth0's /v2/logout endpoint from the OnRedirectToIdentityProviderForSignOut event, per Auth0's quickstart example. However, I don't know how to configure the app to clear the local session when there is an SSO session sign-out from another app. Auth0 mentions:
Redirecting users to the logout endpoint does not cover the scenario where users need to be signed out of all of the applications they used. If you need to provide this functionality you will have to handle this in one of two ways:
Have short timeouts on your local session and redirect to Auth0 at short intervals to re-authenticate. This can be done by calling
checkSessionfrom the client which does this redirect in a hidden iFrame. If you take the hidden iFrame approach you need to be aware of rate limits and third-party cookie issues.Handle this entirely at the application level by providing your applications a way to notify all other applications when a logout occurs.
I get the impression that the checkSession suggestion is intended for SPAs. How does the ASP.NET Core OpenID Connect middleware handle such SSO session sign-outs? Does it automatically re-authenticate with the authentication server at regular intervals? If so, how can this frequency be configured?
ANSWER
Answered 2021-May-28 at 16:53The AddOpenIDConnect middleware module have a dedicated URL that it listens on and that the external provider can call after it has signed out the user.
The URL is defined in the source here and looks like this:
QUESTION
In Angular,we can use routing to create SPAs . So I can have a navigation bar that's common for all templates(or written only once). Basically only required part of the page loads everytime . But in django,so far I haven't seen anything like it. Do i have to include the code for the Nav bar in each template file?
...ANSWER
Answered 2021-May-18 at 21:59You just have to write single time in any html file you can name whatever you want for example _base.html is the file which contains navbar code then i want to insert in every other html file then i just have to enter tag {% extends '_base.html' %} at the top of the other files and that will load the _base.html there as well. If you need more relevant code you can consult that repository as well https://github.com/wsvincent/djangox
QUESTION
I am doing my development using a Chromebook and wondered if it is possible to develop SPAs using Flutter using an online IDE such as Cloud9 or Codio?
I have managed to install flutter and run it to install dart but am getting stuck as it can't find a Chrome installation.
Is it possible to develop using the cloud IDE and use by local install of Chrome for testing?
...ANSWER
Answered 2021-Mar-27 at 22:53Currently, the only closer web approaches are:
- DartPad
- CodePen
- Codespaces
Codespaces being a full VS Code which is currently on Beta Access which will allow the same coding possibilities as the desktop one.
QUESTION
My problem is that I'm unable to understand how server-side rendering single-page application frameworks like Next.js receive prerendered, full HTML on the front end without having to rewrite the entire page. For example, the nextjs website states the following:
By default, Next.js pre-renders every page. This means that Next.js generates HTML for each page in advance, instead of having it all done by client-side JavaScript. Pre-rendering can result in better performance and SEO. Each generated HTML is associated with minimal JavaScript code necessary for that page. When a page is loaded by the browser, its JavaScript code runs and makes the page fully interactive. (This process is called hydration.)
I understand how this bolsters the responsiveness of an SPA on first page load. But after that first load, what makes server-side rendering compatible with SPAs? I think this arises from a fundamental misunderstanding that I can't catch, so here are some further questions I have that might help you to catch it:
- Do SSR SPAs always respond with full prerendered HTML, or only for first page loads?
- If the former is true, then on subsequent responses, how does the client efficiently render only the difference rather than rewriting the whole page?
- Otherwise, if the latter is true, then how does an SSR SPA backend tell when it's responding to a first request, when the response should be the whole HTML, versus a subsequent request, when the bulk of the page is already there and all that needs to be sent is some relatively minimal information?
What am I misunderstanding about what makes SSR compatible with SPAs?
Many thanks in advance to everyone who tackles this question!
...ANSWER
Answered 2021-Mar-31 at 21:54Welcome to Stackoverflow :)
Usually SSR is used for initial rendering of the page, so for the first question - for the first page load
This is necessary, so the SPA will be more SEO-compatible (there also might be some performance improvements with this, but it's usually secondary goal) and Search Engine bots will be able to parse pages without the need for JS
The SSR usually has several important steps:
- Server render
- Sending of rendered data to browser
- Hydration. Hydration - is a ReactJS (since we're talking about next.js here) 'function' that binds the server-rendered HTML to the React on the Frontend. So basically binds server-rendered DOM to virtualDOM
After the hydration step you basically have a fully-functional normal SPA, which has it's own routing and able to fetch data on itself.
Usually you have different endpoint on the BE to fetch the data and to render the page. So basically the rendering process on the BE is somewhat similar to what you have on the FE - your application backend fetches the data from separate endpoints, applies all of the logic and renders the app.
Btw, to ensure that SSR works properly, there is a principle called 'Isomorphic code' - i.e. if you're using a library for data fetching, it has to support both node.js and browser APIs. That's why, for example, you'd have to use Next.js own Router when you have a Next.js application - it just works on both FE and BE unlike react-router, which would require some additional steps to achieve that
QUESTION
I am a little confused as to how I should use the OAuth 2.0 Authorization grant for my web app.
I understand that the Implicit grant for SPAs is now decommissioned and that I should use the Authorization grant.
However the articles and documentation I have read, and the videos I have watched still leave some ambiguity.
If I have a React JS front end and a Spring Boot back end I see three ways in which I could do a token exchange. So when a user clicks login I could:
1) Have my React front end perform the authorization grant without the client secret and obtain the token as recommended by the OAuth 2.0 docs for SPAs
2) Have my React front end perform half of the authorization grant, i.e. get the authorization code. Then pass this on to my back end to exchange the authorization code with the client secret to get a token back, and then pass this token to my front end.
(This is the approach recommended here: what's the alternative to password grant now that it is deprecated? OAUTH 2.0).
To be honest I don't understand how this would work as surely the client IDs for the front end and back end would be different?
3) Have my React Front End delegate the authorization flow to my back end server which can perform the authorization grant using the client secret.
Have I misunderstood something or are all of these approaches possible? What is the recommended approach here?
...ANSWER
Answered 2021-Feb-15 at 20:06These are all viable, but risks are different. Probably the most important difference is what component has access to what during authentication. Consider each of these components could be compromised, what would an attacker gain.
Let's start with #3 above. As a user of this application, I would have to enter my credentials in the SPA, which would then pass it to your backend. Credentials are revealed to both the SPA and the backend, if any of those is compromised, an attacker gains access to username and password pairs directly. This is a risk that you probably don't want to take if you don't have to. Also if the identity provider is a public one (not specific to your application), this would not work, ie. I would not want to enter my Facebook password in your app.
#1 above is better from this perspective, because your backend never has access to actual user credentials (their password). Depending on implementation, the SPA does not need access either, if you redirect your user to the identity provider to enter their password, but that's a UX tradeoff. In this case both the SPA and your backend have the access token, which is susceptible to potential XSS attacks. If either is compromised, the attacker might gain access to the access token and use it while it's valid.
#2 further improves this by the SPA never having access to the access token, only the auth code. In this case the SPA would likely have a regular session (with the session token probably in a httponly cookie) with your backend, which is secure against XSS, and the backend could query whatever resource it has access to with the exchanged access token. You could argue that the SPA had the auth code which an attacker could also exchange for an access token, but on the one hand an auth code should be a one time token, and also the SPA need not store the auth code, it only needs to pass it to the backend once.
The reason all of these exist and are viable is because sometimes you can't do one or the other for reasons outside security. Choose the one that exposes the least things to the least components in your application, while still fulfilling functional, UX and other requirements, and always understand the risk that you are implicitly accepting.
QUESTION
I'm working on a test of Vue Native. Very familiar with native iOS and Android development as well as Vuejs in the context of web/SPAs. Figured I would give Vue Native a go to see about using it for some of our smaller projects. I'm running into an issue though just getting started. Please see below my steps to reproduce the issue I'm running into.
Create a new project:
vue-native init vuenativetest --no-expo
I then followed the basic hello world instructions here: https://vue-native.io/getting-started.html
react-native run-ios --simulator "iPhone 11" // works fine
I then jumped over to setting up a basic component of my own from here but trying to 'organize' the code a bit initially. https://vue-native.io/docs/composing.html
create components/HeaderTest.vue
ANSWER
Answered 2021-Feb-15 at 19:57Seems like you are using div tags which are not supported. The correct tag would be text or view. https://vue-native.io/docs/basic-components.html
QUESTION
when I'm trying to save roles in the database, the "springit.role table doesn't exist" occur.
I'm not creating a table with name "role" in my database because the teacher in the course which I'm learning now didn't create one.
The exception shown when I call the "addUsersAndRoles()" in the DatabaseLoader class method
So, what is the problem?
Role.java
...ANSWER
Answered 2021-Feb-08 at 06:31For sure you are going to need that table, either created by yourself or by Hibernate.
There is a config which you can add to spring boot apps using JPA in order to automatically generate the database schema (or the parts that are missing). Take a look here https://docs.spring.io/spring-boot/docs/1.1.0.M1/reference/html/howto-database-initialization.html
QUESTION
I have a .NET Core 3.1 Web API that I want to add XSRF protection to. So I now require an antiforgery token in an X-XSRF-TOKEN HTTP header on all of my endpoints as described here. JavaScript clients get a token by hitting the /antiforgerytoken endpoint, which sets an XSRF-TOKEN cookie containing the token. This all works fine, but as one would expect, the "Try it out!" feature in Swagger UI no longer works since the requests are missing the X-XSRF-TOKEN HTTP header. Is there a way to have SwaggerUI automatically call the /antiforgerytoken endpoint and include the token in the request being executed?
ANSWER
Answered 2021-Feb-04 at 10:08On Swagger UI, this can be supported by setting a requestInterceptor on the configuration which is a function that intercepts and modifies outgoing requests, including "Try it out" requests. See this comment in Swagger UI repo and the README on Swagger UI configuration.
However, Swashbuckle.AspNetCore.SwaggerUI does not yet support setting requestInterceptor in C# as of the latest stable release (5.6.3). There is this PR that added support for interceptors, and it has been merged but not yet released. So if you are using Swashbuckle.AspNetCore.SwaggerUI, your options for now is to wait for the next release, or build from source a local version before the next official release.
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