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headers in Zillow website - where to get it

The code below extracts data from Zillow Sale.
My 1st question is where people get the headers information.
My 2nd question is how do I know when I needs headers? For some other page like Cars.com, I don't need put headers=headers and I can still get data correctly.
Thank you for your help.
HHC
import requests
from bs4 import BeautifulSoup
import re
url ='https://www.zillow.com/baltimore-md-21201/?searchQueryState=%7B%22pagination%22%3A%7B%7D%2C%22usersSearchTerm%22%3A%2221201%22%2C%22mapBounds%22%3A%7B%22west%22%3A-76.67377295275878%2C%22east%22%3A-76.5733510472412%2C%22south%22%3A39.26716345016057%2C%22north%22%3A39.32309233550334%7D%2C%22regionSelection%22%3A%5B%7B%22regionId%22%3A66811%2C%22regionType%22%3A7%7D%5D%2C%22isMapVisible%22%3Atrue%2C%22filterState%22%3A%7B%22ah%22%3A%7B%22value%22%3Atrue%7D%7D%2C%22isListVisible%22%3Atrue%2C%22mapZoom%22%3A14%7D'
headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36',
'referer': 'https://www.zillow.com/new-york-ny/rentals/2_p/?searchQueryState=%7B%22pagination'
}
raw_page = requests.get(url, headers=headers)
status = raw_page.status_code
print(status)
# Loading the page content into the beautiful soup
page = raw_page.content
page_soup = BeautifulSoup(page, 'html.parser')
print(page_soup)

You can get headers from going to the site with your browser and using the network tab of the developer tools in there, select a request and you can headers sent in requests.
Some websites don't serve bots, so to make them think you're not a bot you set the user agent header to one a browser uses, some sites may require more headers for you to pass the not a bot test. You can see all the headers being sent in developer tools, you can test different headers until your request succeeds.

from your browser go to this website: http://myhttpheader.com/
you will find headers info there.
Secondly, whenever some website like zillow blocks you from scraping data, only then we need to provide headers.
Check this picture:
enter image description here

How can I get URLs from Oddsportal?

How can I get all the URLs from this particular link: https://www.oddsportal.com/results/#soccer
For every URL on this page, there are multiple pages e.g. the first link of the page:
https://www.oddsportal.com/soccer/africa/
leads to the below page as an example:
https://www.oddsportal.com/soccer/africa/africa-cup-of-nations/results/
-> https://www.oddsportal.com/soccer/africa/africa-cup-of-nations/results/#/page/2/...
https://www.oddsportal.com/soccer/africa/africa-cup-of-nations-2019/results/
-> https://www.oddsportal.com/soccer/africa/africa-cup-of-nations-2019/results/#/page/2/...
I would ideally like to code in python as I am pretty comfortable with it (more than other languages through not at all close to what I can call as comfortable)
and
After clicking on the link:
When I go to inspect element, I can see tha the links can be scraped however I am very new to it.
Please help

I have extracted the URLs from the main page that you mentioned.
import requests
import bs4 as bs
url = 'https://www.oddsportal.com/results/#soccer'
headers = {'User-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36'}
resp = requests.get(url, headers=headers)
soup = bs.BeautifulSoup(resp.text, 'html.parser')
base_url = 'https://www.oddsportal.com'
a = soup.findAll('a', attrs={'foo': 'f'})
# This set will have all the URLs of the main page
s = set()
for i in a:
s.add(base_url + i['href'])
Since you are new to web-scraping I suggest you to go through these.
Beautiful Soup - Beautiful Soup is a Python library for pulling data out of HTML and XML files.
Docs: https://www.crummy.com/software/BeautifulSoup/bs4/doc/
requests - Requests is an elegant and simple HTTP library for Python.
Docs: https://docs.python-requests.org/en/master/
Selenium - Selenium is an umbrella project for a range of tools and libraries that enable and support the automation of web browsers.
Docs: https://selenium-python.readthedocs.io/

python requests from usnews.com timing out other websites work fine

url = "https://www.usnews.com"
page = requests.get(url, timeout = 5)
soup = BeautifulSoup(page.content,"html.parser")
requests from usnews.com is not working properly. The code runs forever or times out after five seconds as instructed. I have tried using other websites which work perfectly fine (wikipedia.org, google.com).

They are using a special protection against web scrapers like you. Whenever you go to a website, your web browser sends a special piece of data called a User-Agent. It tells the website what type of browser you are using and if you are on a phone or computer. By default, the requests module doesn't do this.
You can set your own User-Agent pretty easily. Using your website as an example:
import requests
from bs4 import BeautifulSoup
headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36"}
url = "https://www.usnews.com"
page = requests.get(url, headers=headers)
soup = BeautifulSoup(page.content,"html.parser")
This code tells the website that we are an actual person and not a bot.
You can learn more about User Agents here (https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent).

you should try something like selenium this code is similar to selenium but a bit user friendly
from requests_html import HTMLSession
import re
#from fake_useragent import UserAgent
#create the session
#ua = UserAgent()
session = HTMLSession()
#define our URL
url = "https://www.usnews.com"
#use the session to get the data
r = session.get(url)
#Render the page, up the number on scrolldown to page down multiple times on a page
r.html.render(sleep=1,timeout = 30, keep_page=True, scrolldown=1)
print(r.text)
this code mimics a real search engine and should bypass the bot detection

beautiful soup returns none when the element exists in browser

I have looked through the previous answers but none seemed to be applicable. I am building an open source quizlet scraper to extract all links from a class (e.g. https://quizlet.com/class/3675834/). In this case, the tag is a and class is "UILink". But when I use the following code, the list returned does not contain the element that I am looking for. Is it because of the JavaScript issue described here?
I tried to use the previous method of importing folder as written here but it does not contain the urls.
How can I scrape these urls?
import requests
from bs4 import BeautifulSoup
headers = {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36"
}
url = 'https://quizlet.com/class/8536895/'
response = requests.get(url, verify=False, headers=headers)
soup = BeautifulSoup(response.text,'html.parser')
b = soup.find_all("a", class_="UILink")

You wouldn't be able to directly scrape dynamic webpages using just requests. What you see browser is fully rendered page taken care by browser.
Inorder to scrape data from these kind of webpages, you following any of below approaches.
Use requests-html instead of requests
pip install requests-html
scraper.py
from requests_html import HTMLSession
from bs4 import BeautifulSoup
session = HTMLSession()
url = 'https://quizlet.com/class/8536895/'
response = session.get(url)
response.html.render() # render the webpage
# access html page source with html.html
soup = BeautifulSoup(response.html.html, 'html.parser')
b = soup.find_all("a", class_="UILink")
print(len(b))
Note: this uses headless browser(chromium) under the hood to render the page. So it can timeout or be a little slow at times.
Use selenium webdriver
Use driver.get(url) to get the page and pass the page source to beautiful Soup with driver.page_source
Note: run this in headless mode as well and there might be some latency at times.

Web Scraping using Python sometimes fetch result sometimes results in HTTP 429

I am trying to scrape reddit pages for the videos. I am using python and beautiful soup to do the job.The following code sometimes return the result and sometimes not when I rerun the code.I'm not sure where i'm going wrong. Can someone help? I'm a newbie to python so please bear with me.
import requests
from bs4 import BeautifulSoup
page = requests.get('https://www.reddit.com/r/FortNiteBR/comments/afjbbp/just_trying_to_revive_my_buddy_and_then_he_got/')
soup = BeautifulSoup(page.text, 'html.parser')
source_tags = soup.find_all('source')
print(source_tags)

if you do print (page) after your page = requests.get('https:/.........'), you'll see you get a successful <Response [200]>
But if you run it quickly again, you'll get the <Response [429]>
"The HTTP 429 Too Many Requests response status code indicates the user has sent too many requests in a given amount of time ("rate limiting")." Source here
Additonally, if you look at the html source, you'd see:
<h1>whoa there, pardner!</h1>
<p>we're sorry, but you appear to be a bot and we've seen too many requests
from you lately. we enforce a hard speed limit on requests that appear to come
from bots to prevent abuse.</p>
<p>if you are not a bot but are spoofing one via your browser's user agent
string: please change your user agent string to avoid seeing this message
again.</p>
<p>please wait 6 second(s) and try again.</p>
<p>as a reminder to developers, we recommend that clients make no
more than <a href="http://github.com/reddit/reddit/wiki/API">one
request every two seconds</a> to avoid seeing this message.</p>
To add headers and avoid the 429 add in:
headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36"}
page = requests.get('https://www.reddit.com/r/FortNiteBR/comments/afjbbp/just_trying_to_revive_my_buddy_and_then_he_got/', headers=headers)
Full code:
import requests
from bs4 import BeautifulSoup
headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36"}
page = requests.get('https://www.reddit.com/r/FortNiteBR/comments/afjbbp/just_trying_to_revive_my_buddy_and_then_he_got/', headers=headers)
print (page)
soup = BeautifulSoup(page.text, 'html.parser')
source_tags = soup.find_all('source')
print(source_tags)
Output:
<Response [200]>
[<source src="https://v.redd.it/et9so1j0z6a21/HLSPlaylist.m3u8" type="application/vnd.apple.mpegURL"/>]
and have had no issues rerunning multiple times after waiting a second or 2

I have tried below code and it is working for me at every request, Added timeout of 30 sec.
import requests
from bs4 import BeautifulSoup
page = requests.get('https://www.reddit.com/r/FortNiteBR/comments/afjbbp/just_trying_to_revive_my_buddy_and_then_he_got/', timeout=30)
if page.status_code == 200:
soup = BeautifulSoup(page.text, 'lxml')
source_tags = soup.find_all('source')
print(source_tags)
else:
print(page.status_code, page)