JBoss EAP7.3 udemy note

 1. The linux command

netstat -an|more: list the active internet connections

nslookup ip/dn: convert ip to dn or dn to ip

2. JBoss server log:

Compile and Run C++ program on mac (m1)

 Compile and Run C++ program on mac (m1):

#include <iostream>

using namespace std;

int main() {
    cout << "Hello, World!" << endl;
    return 0;
}

g++ -o hello hello.cpp

./hello

algorithms

 1. Find the common number between different int array.

2. Find the same String between different String array. How about if the arrays are super fast, say the duplicate name between US and Canada? two big files

3. Query a LOL player's statistics

4. Display photos

    Display photos with username/password

    Display photos with username/password (no hack/partly)

boolean/int

+-*/ ++ --

== != > < >= <=

&& ||

if/else

swtich(expression){

case c1:

..break;

default:

}

array

For loop

recursion

constructor

static

Math.sqrt(x*x+y*y)

calculate what day after 100 days

read file/write file

Swing

Enterprise OAuth2 and Open ID Connect note (Udemy)

 Enterprise OAuth2 and Open ID Connect

1. Federated user

a single user identity used by all the applications

2. SAML flow

3. What is OAuth2

4. Opaque token

     need verify access token with authorization server every time

5. JWT token

   

   The resource server can verify the signed JWT token by itself, with the public signer

6. Grant type - auth code

Auth code is on the front channal but it expires a few mins, access token is on the back channel

7. Grant type - Implicit

Return the access token from the front channel directly - could be stolen, deprecated

8. Grant type - Client credentials

    Pretty simple, no resource owner/browser agent.

9. Grant Type - ROPC

    Resource Owner Password Credential - deprecated, need the client application and the resource server are the same organization (client application is third party) as the password is exposed to the client application. For example, shutterfly cannot use this grant type.

10. OpenID

 

Angular redux

 Angular redux

The power of now

Introduction: 

imminent: imminent death

relinquish: one learns to relinquish mental/emotinal resistance to the "suchness" of the present moment

intersperse: almost continuous anxiety interspersed with periods of suicidal depression

dread: a feeling of absolute dread

loathing: a ddep loathing of the world

loathsome: The most loathsome thing of all, however, was my own existence

annihilation: a deep long for annihilation

luminosity: That soft luminosity filtering through the curtains was love itself.

prisitine: Everything was fresh and prestine

palpable: Sometimes it is very strong, almost palpable, and others can feel it too

eon: have kept humans in bondage to suffering for eons

verbatim: Some of the questions and answers I wrote down almost verbatim

extraneous: overlaid with extraneous matter

obscure: alsmot completely obscured by it

exaltation: There is then a feeling of exaltation and heightened aliveness

How to skip the OPTIONS preflight request

 

When trying to post request directly from angular, got the CORS error:

Access to XMLHttpRequest at '***' from origin 'http://localhost:4200' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

The browser adds a OPTION call (preflight) as the content-type is application/json

Can add a chrome shortcut like the below to make the request successful:

"C:\Program Files\Google\Chrome\Application\chrome.exe" --disable-web-security --user-data-dir="c:/chrome_dev"