nginX by default does not set CORS headers for requests with error status codes like 401. There are 2 options here to add CORS headers:

1- If your nginX version is new you have the option of always to add to add_header:

add_header 'Access-Control-Allow-Origin' $http_origin always;

2- If you got error of invalid number of arguments in "add_header" directive, then use more_set_headers:

more_set_headers -s '401 400 403 404 500' 'Access-Control-Allow-Origin: $http_origin';

NOTE: when this error happens then in $.ajax or any similar method you wont have access to status codes. So be extremely catious!!!

#nginX #web_server #CORS #more_set_headers #add_header #ajax

How to upload a text content as a file in $.Ajax()?

FormData class is used to create a multipart/form-data inside of JS code. A sample code speaks thousand words:

var formData = new FormData();
 var blob = new Blob([YOUR_CONTENT_HERE], { type: "text/html"});
 formData.append("file", blob);

We have created a binary data from the text which is in the format of text/html, then I have appended the data as an input file with the name of file (which will be captured on server-side).

The Ajax part is utterly simple:

$.ajax({
     type: 'POST',
     url: 'https://www.example.com/storage',
     data: formData,
     processData: false,
     contentType: false
 }).done(function(data) {});

NOTE: DO NOT OMIT processData, contentType parameters.

#javascript #jQuery #ajax #FormData #Blob #upload

Today's Tech Term:

D2D: D2D is shorthand for Disk-To-Disk and refers to data backups using disks.

#tech_terms #D2D #disk_to_disk

https://github.com/rastikerdar/vazir-font

#font #vazir_font #github

https://stackoverflow.com/questions/1964839/how-can-i-create-a-please-wait-loading-animation-using-jquery

#jquery #ajax #loading

By using the below library in JS you can get OS name, Browser name and version and many more stuff from within Java Script:

- https://github.com/faisalman/ua-parser-js

#github #uaparserjs #ua_parser_js

DAAS: DAAS (short for Data As A Service) is a “central repository”/”cloud strategy” that facilitates on-demand accessibility of business-critical data by an organization’s users in a timely manner.


#tech_term #DAAS

What is the difference between the below exceptions:

try:
     // Your code block
 except:
     // Your exception block

Vs:

try:
     // Your code block
 except Exception:
     // Your exception block

A bare except: clause will catch SystemExit and KeyboardInterrupt exceptions, making it harder to interrupt a program with Control-C, and can disguise other problems. If you want to catch all exceptions that signal program errors, use except Exception: (bare except is equivalent to `except BaseException:`).

NOTE: When catching exceptions, mention specific exceptions whenever possible instead of using a bare except: clause.

A better try & except:

try:
      import platform_specific_module
  except ImportError:
      platform_specific_module = None

#python #PEP8 #try #except #try_except #exception

https://angularconsole.com/

#angular #cli #console #GUI

Does that happen for you too, to CD into a wrong directory and need to get back to the previous directory?

Let's say you are in a long path like /mnt/new_volume/backup/files/archive, now you switch to home of your directory. In order to get back to the previous directory, you just need to issue the below command:

cd -

#linux #cd

https://spyhce.com/blog/understanding-new-and-init

#python27 #python3 #__init__ #__new__ #old_style #new_style #OOP #class #super

👆 Great library for creating python scripts for server maintenance. Read on.

https://click.palletsprojects.com/en/7.x/commands/

#python #click

What do you think the best way is to extract active users from the list below in Python?

users = [
    {
       "email":"[email protected]",
       "is_active":True
    },
    {
       "email":"[email protected]",
       "is_active":True
    },
    {
       "email":"[email protected]",
       "is_active":False
    },
    {
       "email":"[email protected]",
       "is_active":False
    }
 ]

Waiting for the answers :)

#python #question

active_users = filter(lambda x:x['is_active'], users)

#python #filter #lambda

#python #generator #coroutine #next #StopIteration

In axigen mail server you can set a filter that if sender email address (from) has a specific text using regexp then redirect it to
another mailbox:

Security and Filtering -> Acceptance and Routing -> Advanced settings -> Add acceptance / routing rule

Phew! Now in Conditions section open combo box and select Email under Recipient. Click Add condition. A text box is appeared now which you can select Regexp from the combo box and enter your regex like:

.*SpecificSender.*

Now in actions section in name enter the mail address you want to receive emails in and in Folder text box enter INBOX.

This is it.

#mail #mail_server #axigen #filter #routing

In MongoDB you can compare one field to another using $expr:

db.users.find({ $expr: { $eq: ["$created_at", "$updated_at"] } })

Here we get users that their updated_at field is equal to created_at field, here it means that user has not yet updated his profile.

#mongodb #mongo #expr #find