JWTs consist of [base64url encoded JSON][1], and a JSON structure just starts with `{&quot;...`, which becomes `ey...`when encoded with a base64 encoder.
The JWT header starts with `{&quot;alg&quot;:...`, which then becomes `eyJ...`

You can try on this [online encoder](https://www.base64encode.org/) and enter `{&quot;alg&quot;`  and click on encode. The result will be `eyJhbGciPSA=`


  [1]: https://www.rfc-editor.org/rfc/rfc7519#3.0

When I updated my site, run npm run build and upload the new files to the server I am still looking the old version of my site. 


Without React, I can see the new version of my site with cache-busting. I do this: 

Previous file 

    &lt;link rel=&quot;stylesheet&quot; href=&quot;/css/styles.css&quot;&gt;

New file 

    &lt;link rel=&quot;stylesheet&quot; href=&quot;/css/styles.css?abcde&quot;&gt;

How can I do something like this or to achieve cache busting with create react app?

There are many threads in the GitHub of create react app about this but no one has a proper/simple answer.  




  [1]: https://github.com/Alfrex92/serverlessapps

Cache busting with CRA React

&lt;!-- language-all: lang-python --&gt;

I want to filter dataframe according to the following conditions firstly (d&lt;5)  and  secondly (value of col2 not equal its counterpart in col4 if value in col1 equal its counterpart in col3).

If the original dataframe `DF` is as follows:

    +----+----+----+----+---+
    |col1|col2|col3|col4|  d|
    +----+----+----+----+---+
    |   A|  xx|   D|  vv|  4|
    |   C| xxx|   D|  vv| 10|
    |   A|   x|   A|  xx|  3|
    |   E| xxx|   B|  vv|  3|
    |   E| xxx|   F| vvv|  6|
    |   F|xxxx|   F| vvv|  4|
    |   G| xxx|   G| xxx|  4|
    |   G| xxx|   G|  xx|  4|
    |   G| xxx|   G| xxx| 12|
    |   B|xxxx|   B|  xx| 13|
    +----+----+----+----+---+

The desired Dataframe is:

    +----+----+----+----+---+
    |col1|col2|col3|col4|  d|
    +----+----+----+----+---+
    |   A|  xx|   D|  vv|  4|
    |   A|   x|   A|  xx|  3|
    |   E| xxx|   B|  vv|  3|
    |   F|xxxx|   F| vvv|  4|
    |   G| xxx|   G|  xx|  4|
    +----+----+----+----+---+

Code I have tried that did not work as expected:

    cols=[(&#39;A&#39;,&#39;xx&#39;,&#39;D&#39;,&#39;vv&#39;,4),(&#39;C&#39;,&#39;xxx&#39;,&#39;D&#39;,&#39;vv&#39;,10),(&#39;A&#39;,&#39;x&#39;,&#39;A&#39;,&#39;xx&#39;,3),(&#39;E&#39;,&#39;xxx&#39;,&#39;B&#39;,&#39;vv&#39;,3),(&#39;E&#39;,&#39;xxx&#39;,&#39;F&#39;,&#39;vvv&#39;,6),(&#39;F&#39;,&#39;xxxx&#39;,&#39;F&#39;,&#39;vvv&#39;,4),(&#39;G&#39;,&#39;xxx&#39;,&#39;G&#39;,&#39;xxx&#39;,4),(&#39;G&#39;,&#39;xxx&#39;,&#39;G&#39;,&#39;xx&#39;,4),(&#39;G&#39;,&#39;xxx&#39;,&#39;G&#39;,&#39;xxx&#39;,12),(&#39;B&#39;,&#39;xxxx&#39;,&#39;B&#39;,&#39;xx&#39;,13)]
    df=spark.createDataFrame(cols,[&#39;col1&#39;,&#39;col2&#39;,&#39;col3&#39;,&#39;col4&#39;,&#39;d&#39;])

    df.filter((df.d&lt;5)&amp; (df.col2!=df.col4) &amp; (df.col1==df.col3)).show()

    +----+----+----+----+---+
    |col1|col2|col3|col4|  d|
    +----+----+----+----+---+
    |   A|   x|   A|  xx|  3|
    |   F|xxxx|   F| vvv|  4|
    |   G| xxx|   G|  xx|  4|
    +----+----+----+----+---+

What should I do to achieve the desired result?


Pyspark: Filter dataframe based on multiple conditions

I am using `JWT` token to authorize my APIs, during implementation I found header and payload in token always start with `eyJ`. What does this indicate?

Why header and payload in the JWT token always starts with eyJ

<p>I am using <code>JWT</code> token to authorize my APIs, during implementation I found header and payload in token always start with <code>eyJ</code>. What does this indicate?</p>


Is it possible to support multiple JWT Token issuers in ASP.NET Core 2?
I want to provide an API for external service and I need to use two sources of JWT tokens - Firebase and custom JWT token issuers. In ASP.NET core I can set the JWT authentication for Bearer auth scheme, but only for one Authority:
  

      services
            .AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
            .AddJwtBearer(options =&gt;
            {
                options.Authority = &quot;https://securetoken.google.com/my-firebase-project&quot;
                options.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuer = true,
                        ValidIssuer = &quot;my-firebase-project&quot;
                        ValidateAudience = true,
                        ValidAudience = &quot;my-firebase-project&quot;
                        ValidateLifetime = true
                    };
            }

I can have multiple issuers and audiences, but I can&#39;t set several Authorities.


Use multiple JWT Bearer Authentication

I&#39;ve configured the token like this:

    jwt.sign(
      {
        user: pick(user, [&#39;_id&#39;, &#39;username&#39;])
      },
      secret,
      {
        expiresIn: &#39;2m&#39;
      }
    );

But when I want to check if the token was expired, this code doesn&#39;t work:

    function isAuthenticated() {
      const token = localStorage.getItem(&#39;token&#39;);
      const refreshToken = localStorage.getItem(&#39;refreshToken&#39;);
      try {
        decode(token);
        const { exp } = decode(refreshToken);
        if (exp &lt; (new Date().getTime() + 1) / 1000) {
          return false;
        }
      } catch (err) {
        return false;
      }
      return true;
    }

The problem is this part:

    if (exp &lt; (new Date().getTime() + 1) / 1000) {
      return false;
    }

new Date().getTime() + 1) / 1000 = 1531335468.113

exp = 1531334595

Because I don&#39;t know what format of time JWT uses...

How can I resolve this?




Check if token expired using this JWT library

I am using React SPA, Express, Express-session, Passport, and JWT.
I&#39;m confused about some of the different client-side storage options to store tokens: Cookies, Session, and JWT / Passport.

Do tokens have to be stored in cookies, even if I can store them in `req.sessionID`?

Many websites use cookies to store shopping cart tokens. So far I have stored shopping cart data based on the session ID without adding any cookies.

&gt; So when users visit my website, I will match it with their
&gt; `req.sessionID` and then retrieve the data in the database like shopping carts and user session.

Do I need to store cookies? I can access it via `req.sessionID` to get the data needed.

**And the second**

I have made authentication using a `passport-google-oauth20`.After I successfully login, the data is saved into the session. and to send it to the client I have to send it via the URL query `?token=&#39;sdsaxas&#39;`. 

&gt; in this case I get a lot of difference of opinion. someone saved it
&gt; into local storage and someone saved it into cookies by converting it to a token using JWT.

     jwt.sign(
            payload,
            keys.jwt.secretOrPrivateKey, 
            {
                expiresIn:keys.jwt.expiresIn // &lt; i dont know what is this expired for cookies or localstorage ?
            }, (err, token) =&gt; {
             
                res.redirect(keys.origin.url + &quot;?token=&quot; + token);
            });

**Can I indeed store everything related to the session by using sessionID (without cookies or localstorage)?**

Only by doing fetch once or every page refresh and retrieving the data and then saved into redux because I use React SPA.

Content Type	Original Author	Original Content on Stackoverflow
Question	Suresh Prajapati	View Question on Stackoverflow
Solution 1 - Jwt	jps	View Answer on Stackoverflow

Why header and payload in the JWT token always starts with eyJ

Jwt Problem Overview

Jwt Solutions

Solution 1 - Jwt

Pyspark: Filter dataframe based on multiple conditions

Cache busting with CRA React

Attributions