C¨¢c User Agent T?t Nh?t ?? Scrape Web & C¨¢ch S? D?ng Ch¨²ng

Anh Tuan
Data Science Expert
07-Mar-2025

Khi th?c hi?n web scraping, s? d?ng user agent sai c¨® th? d?n ??n b? ch?n ngay l?p t?c. C¨¢c trang web th??ng d?a v¨¤o user agent ?? ph?n bi?t gi?a ng??i d¨´ng th?c v¨¤ bot. ?? tr¨¢nh b? ph¨¢t hi?n, ?i?u quan tr?ng l¨¤ ph?i s? d?ng user agent ???c ??nh d?ng t?t v¨¤ c?p nh?t th??ng xuy¨ºn trong c¨¢c d? ¨¢n web scraping c?a b?n.
Trong h??ng d?n n¨¤y, b?n s? kh¨¢m ph¨¢:
- User agent l¨¤ g¨¬ v¨¤ t?i sao n¨® quan tr?ng ??i v?i web scraping
- Danh s¨¢ch c¨¢c user agent t?t nh?t ?? scraping
- C¨¢ch ??t v¨¤ lu?n chuy?n user agent trong Python
- C¨¢c th?c ti?n t?t nh?t b? sung ?? tr¨¢nh b? ch?n
H?y b?t ??u! ?
User Agent l¨¤ g¨¬?
User Agent (UA) l¨¤ m?t chu?i ???c g?i trong ti¨ºu ?? y¨ºu c?u HTTP ?? x¨¢c ??nh tr¨¬nh duy?t, h? ?i?u h¨¤nh v¨¤ c¨¢c chi ti?t kh¨¢c. M¨¢y ch? web s? d?ng th?ng tin n¨¤y ?? hi?n th? n?i dung ph¨´ h?p cho thi?t b? c?a ng??i d¨´ng.
V¨ª d? v? chu?i User Agent:
plaintext
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
Ph?n t¨ªch:
Mozilla/5.0
¨C H? tr¨¬nh duy?t(Windows NT 10.0; Win64; x64)
¨C Chi ti?t h? ?i?u h¨¤nhAppleWebKit/537.36 (KHTML, like Gecko)
¨C C?ng c? hi?n th?Chrome/123.0.0.0
¨C Phi¨ºn b?n tr¨¬nh duy?tSafari/537.36
¨C Khung t??ng th¨ªch
B?ng c¨¢ch s?a ??i user agent, b?n c¨® th? l¨¤m cho web scraper c?a m¨¬nh tr?ng gi?ng nh? m?t tr¨¬nh duy?t th?c, gi?m nguy c? b? ph¨¢t hi?n.
T?i sao User Agent quan tr?ng ??i v?i Web Scraping
H?u h?t c¨¢c trang web ph?n t¨ªch user agent ?? l?c l?u l??ng truy c?p c?a bot. N?u scraper c?a b?n g?i m?t user agent kh?ng h?p l? ho?c l?i th?i, n¨® c¨® th? b? ch?n ngay l?p t?c.
B?ng c¨¢ch s? d?ng user agent ph¨´ h?p, b?n c¨® th?:
- M? ph?ng m?t tr¨¬nh duy?t th?c v¨¤ h¨°a nh?p v?i l?u l??ng truy c?p b¨¬nh th??ng.
- B? qua c¨¢c bi?n ph¨¢p b?o v? ch?ng bot ki?m tra c¨¢c th? vi?n scraping m?c ??nh.
- C?i thi?n t? l? th¨¤nh c?ng c?a y¨ºu c?u v¨¤ tr¨¢nh CAPTCHA ho?c b? c?m IP.
Tuy nhi¨ºn, ch? s? d?ng m?t user agent l?p ?i l?p l?i v?n c¨® th? k¨ªch ho?t c¨¢c h? th?ng ch?ng bot. ?¨® l¨¤ l? do t?i sao lu?n chuy?n user agent r?t quan tr?ng.
C¨¢c User Agent t?t nh?t cho Web Scraping (Danh s¨¢ch c?p nh?t)
D??i ??y l¨¤ danh s¨¢ch ???c tuy?n ch?n c¨¢c user agent hi?u qu? ?? web scraping:
User Agent c?a Google Chrome:
plaintext
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
User Agent c?a Mozilla Firefox:
plaintext
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0
Mozilla/5.0 (Macintosh; Intel Mac OS X 14.4; rv:124.0) Gecko/20100101 Firefox/124.0
Mozilla/5.0 (X11; Linux i686; rv:124.0) Gecko/20100101 Firefox/124.0
C¨¢c tr¨¬nh duy?t kh¨¢c:
plaintext
Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Safari/605.1.15
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 Edg/123.0.2420.81
? M?o: B?n c¨® th? ki?m tra user agent c?a m¨¬nh b?ng c¨¢ch truy c?p WhatIsMyUserAgent.
C¨¢ch ??t User Agent t¨´y ch?nh trong Python
Nhi?u trang web tri?n khai c? ch? ph¨¢t hi?n bot ch?n c¨¢c y¨ºu c?u thi?u ho?c c¨® ti¨ºu ?? user-agent kh?ng ch¨ªnh x¨¢c. Trong ph?n n¨¤y, ch¨²ng ta h?y s? d?ng c¨¢c c¨¢ch kh¨¢c nhau ?? ??t v¨¤ lu?n chuy?n user agent hi?u qu?.
1. S? d?ng th? vi?n requests
C¨¢ch ??n gi?n nh?t ?? ??nh ngh?a user agent l¨¤ s?a ??i ti¨ºu ?? c?a m?t y¨ºu c?u b?ng th? vi?n requests
ph? bi?n.
V¨ª d?: ??t User Agent t?nh
python
import requests
# ??nh ngh?a ti¨ºu ?? v?i User-Agent t¨´y ch?nh
headers = {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36"
}
# G?i y¨ºu c?u v?i User-Agent t¨´y ch?nh
response = requests.get("https://httpbin.org/headers", headers=headers)
# In ti¨ºu ?? ph?n h?i
print(response.text)
K?t qu?:
json
{
"headers": {
"Accept": "*/*",
"Accept-Encoding": "gzip, deflate",
"Host": "httpbin.org",
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36"
}
}
?i?u n¨¤y x¨¢c nh?n r?ng m¨¢y ch? nh?n v¨¤ nh?n d?ng chu?i user agent m?t c¨¢ch ch¨ªnh x¨¢c.
2. Lu?n chuy?n User Agent ?? t?ng t¨ªnh ?n danh
S? d?ng m?t user agent duy nh?t l?p ?i l?p l?i c¨® th? d?n ??n b? ch?n. ?? tr¨¢nh ?i?u n¨¤y, h?y lu?n chuy?n user agent b?ng c¨¢ch s? d?ng danh s¨¢ch ???c x¨¢c ??nh tr??c.
V¨ª d?: Lu?n chuy?n User Agent v?i random
python
import requests
import random
# Danh s¨¢ch c¨¢c user agent kh¨¢c nhau
user_agents = [
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0"
]
# Ch?n m?t user agent ng?u nhi¨ºn
headers = {"User-Agent": random.choice(user_agents)}
# G?i y¨ºu c?u v?i user agent ???c ch?n ng?u nhi¨ºn
response = requests.get("https://httpbin.org/headers", headers=headers)
print(response.text)
B?ng c¨¢ch lu?n chuy?n user agent, scraper c?a b?n tr?ng gi?ng ng??i d¨´ng h?n v¨¤ gi?m kh? n?ng b? ph¨¢t hi?n.
3. S? d?ng fake_useragent
?? t?o User Agent ??ng
Thay v¨¬ duy tr¨¬ m?t danh s¨¢ch t?nh, b?n c¨® th? t?o user agent ??ng b?ng th? vi?n fake_useragent
.
C¨¤i ??t:
sh
pip install fake-useragent
V¨ª d?: T?o User Agent ng?u nhi¨ºn
python
from fake_useragent import UserAgent
import requests
# T?o ??i t??ng UserAgent
ua = UserAgent()
# T?o user agent ng?u nhi¨ºn
headers = {"User-Agent": ua.random}
# G?i y¨ºu c?u v?i user agent ???c t?o ??ng
response = requests.get("https://httpbin.org/headers", headers=headers)
print(response.text)
Ph??ng ph¨¢p n¨¤y cung c?p nhi?u lo?i user agent h?n trong khi v?n gi? cho ch¨²ng ???c c?p nh?t.
4. ??t User Agent t¨´y ch?nh trong Selenium
Khi s? d?ng Selenium ?? web scraping, vi?c ??t user agent y¨ºu c?u s?a ??i t¨´y ch?n tr¨¬nh duy?t.
V¨ª d?: ??t User Agent trong Chrome
python
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
# C?u h¨¬nh t¨´y ch?n Chrome
chrome_options = Options()
chrome_options.add_argument("user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36")
# Kh?i ch?y tr¨¬nh duy?t v?i user agent t¨´y ch?nh
driver = webdriver.Chrome(options=chrome_options)
# M? trang ki?m tra ?? x¨¢c minh user agent
driver.get("https://httpbin.org/headers")
# Tr¨ªch xu?t v¨¤ in n?i dung trang
print(driver.page_source)
driver.quit()
B?ng c¨¢ch s? d?ng c¨¢c c?ng c? t? ??ng h¨®a tr¨¬nh duy?t nh? Selenium, b?n c¨® th? m? ph?ng h¨¤nh vi c?a ng??i d¨´ng th?c v¨¤ b? qua c¨¢c bi?n ph¨¢p ch?ng bot n?ng cao.
5. X¨¢c minh User Agent c?a b?n
?? ??m b?o user agent c?a b?n ???c ??t ch¨ªnh x¨¢c, h?y s? d?ng c¨¢c ph??ng ph¨¢p sau:
- Ki?m tra ti¨ºu ?? ph?n h?i t?
https://httpbin.org/headers
- S? d?ng c?ng c? d¨¤nh cho nh¨¤ ph¨¢t tri?n tr¨¬nh duy?t (F12 > Network > Headers) ?? ki?m tra y¨ºu c?u
- S? d?ng nh?t k? ?? x¨¢c nh?n vi?c lu?n chuy?n user agent trong scraper
V¨ª d?: Nh?t k? User Agent trong v¨°ng l?p
python
import requests
import random
import time
# Danh s¨¢ch user agent
user_agents = [
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0"
]
# V¨°ng l?p qua c¨¢c y¨ºu c?u
for i in range(5):
user_agent = random.choice(user_agents)
headers = {"User-Agent": user_agent}
response = requests.get("https://httpbin.org/headers", headers=headers)
print(f"Y¨ºu c?u {i+1} - User-Agent: {user_agent}")
time.sleep(2) # Th¨ºm ?? tr? ?? tr¨¢nh gi?i h?n t?c ??
Script n¨¤y ghi l?i c¨¢c user agent kh¨¢c nhau tr¨ºn nhi?u y¨ºu c?u, gi¨²p b?n g? l?i c¨¢c chi?n l??c lu?n chuy?n.
C¨¢ch Lu?n chuy?n User Agent ? quy m? l?n
Thay v¨¬ s? d?ng m?t user agent t?nh duy nh?t, t?t h?n l¨¤ lu?n chuy?n ch¨²ng m?t c¨¢ch ??ng ?? tr¨¢nh b? ph¨¢t hi?n. D??i ??y l¨¤ c¨¢ch b?n c¨® th? lu?n chuy?n user agent trong Python:
python
import requests
import random
user_agents = [
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36"
]
headers = {"User-Agent": random.choice(user_agents)}
response = requests.get("https://httpbin.org/headers", headers=headers)
print(response.text)
Script n¨¤y ch?n ng?u nhi¨ºn m?t user agent t? danh s¨¢ch, l¨¤m cho scraper c?a b?n kh¨® b? ph¨¢t hi?n h?n.
C¨¢c th?c ti?n t?t nh?t b? sung ?? tr¨¢nh b? ch?n
Ngay c? v?i c¨¢c user agent t?t nh?t, web scraping y¨ºu c?u c¨¢c k? thu?t b? sung ?? kh?ng b? ph¨¢t hi?n:
- S? d?ng proxy ?? tr¨¢nh b? c?m IP.
- Tri?n khai ?? tr? & kho?ng th?i gian ng?u nhi¨ºn gi?a c¨¢c y¨ºu c?u.
- Lu?n chuy?n ti¨ºu ?? v¨¤ m?u y¨ºu c?u ?? b?t ch??c h¨¤nh vi c?a con ng??i.
- Tr¨¢nh scraping qu¨¢ m?c ?? tr¨¢nh k¨ªch ho?t gi?i h?n t?c ??.
- Gi¨¢m s¨¢t m? ph?n h?i ?? ph¨¢t hi?n b? ch?n v¨¤ ?i?u ch?nh cho ph¨´ h?p.
Ngay c? v?i vi?c lu?n chuy?n user-agent v¨¤ proxy v¨¤ t?t c? nh?ng l?i khuy¨ºn ?¨®, c¨¢c trang web v?n c¨® th? tri?n khai c¨¢c k? thu?t ph¨¢t hi?n n?ng cao, ch?ng h?n nh? nh?n d?ng d?u v?n tay, th? th¨¢ch JavaScript v¨¤ x¨¢c minh CAPTCHA. ??y l¨¤ l¨²c CapSolver ph¨¢t huy t¨¢c d?ng.
CapSolver chuy¨ºn gi?i quy?t c¨¢c th? th¨¢ch Capttcha, ??m b?o web scraping kh?ng b? gi¨¢n ?o?n. B?ng c¨¢ch t¨ªch h?p CapSolver, b?n c¨® th? t? ??ng gi?i quy?t CAPTCHA v¨¤ gi? cho scraper c?a b?n ho?t ??ng tr?n tru
Nh?n M? khuy?n m?i c?a b?n cho c¨¢c gi?i ph¨¢p captcha h¨¤ng ??u - CapSolver: CAPTCHA. Sau khi ??i, b?n s? nh?n ???c th¨ºm 5% ti?n th??ng sau m?i l?n n?p ti?n, Kh?ng gi?i h?n
K?t lu?n
S? d?ng user agent ?¨²ng l¨¤ m?t b??c quan tr?ng trong web scraping. Trong h??ng d?n n¨¤y, ch¨²ng ta ?? ?? c?p ??n:
? User agent l¨¤ g¨¬ v¨¤ c¨¢ch ho?t ??ng c?a n¨®
? Danh s¨¢ch c¨¢c user agent hi?u qu? ?? scraping
? C¨¢ch ??t v¨¤ lu?n chuy?n user agent trong Python
? C¨¢c th?c ti?n t?t nh?t b? sung ?? kh?ng b? ph¨¢t hi?n
B?ng c¨¢ch k?t h?p vi?c lu?n chuy?n user agent v?i c¨¢c k? thu?t ch?ng ph¨¢t hi?n kh¨¢c, b?n c¨® th? thu th?p d? li?u th¨¤nh c?ng m¨¤ kh?ng b? ch?n.
C?u h?i th??ng g?p
1. User agent trong web scraping l¨¤ g¨¬?
User agent l¨¤ m?t chu?i x¨¢c ??nh tr¨¬nh duy?t ho?c ph?n m?m kh¨¢ch h¨¤ng cho m¨¢y ch? web. Trong web scraping, n¨® ???c s? d?ng ?? b?t ch??c ho?t ??ng c?a ng??i d¨´ng th?c v¨¤ tr¨¢nh b? ph¨¢t hi?n.
2. Web scraping cho m?c ?¨ªch c¨¢ nh?n c¨® b?t h?p ph¨¢p kh?ng?
Web scraping th??ng h?p ph¨¢p cho m?c ?¨ªch c¨¢ nh?n, nh?ng b?n ph?i t?n tr?ng ?i?u kho?n d?ch v? c?a trang web v¨¤ tr¨¢nh scraping d? li?u nh?y c?m ho?c c¨® b?n quy?n.
3. M?c ?¨ªch c?a vi?c lu?n chuy?n user agent trong web scraping l¨¤ g¨¬?
Vi?c lu?n chuy?n user agent gi¨²p tr¨¢nh b? ph¨¢t hi?n v¨¤ ch?n b?ng c¨¢ch l¨¤m cho c¨¢c y¨ºu c?u tr?ng nh? ??n t? c¨¢c tr¨¬nh duy?t ho?c thi?t b? kh¨¢c nhau.
4. L¨¤m th? n¨¤o t?i c¨® th? ng?n ch?n vi?c b? ch?n trong khi web scraping?
?? tr¨¢nh b? ch?n, h?y s? d?ng lu?n chuy?n IP, gi?i quy?t CAPTCHA, ?? tr? gi?a c¨¢c y¨ºu c?u v¨¤ ??m b?o tu?n th? robots.txt c?a trang web.
5. Web scraping c¨® th? ?nh h??ng ??n hi?u su?t c?a trang web kh?ng?
C¨®, scraping qu¨¢ th??ng xuy¨ºn c¨® th? l¨¤m qu¨¢ t?i m¨¢y ch? c?a trang web. ?i?u quan tr?ng l¨¤ ph?i scraping m?t c¨¢ch c¨® tr¨¢ch nhi?m v?i s? l??ng y¨ºu c?u h?n ch?.
Tuy¨ºn b? Tu?n th?: Th?ng tin ???c cung c?p tr¨ºn blog n¨¤y ch? mang t¨ªnh ch?t tham kh?o. CapSolver cam k?t tu?n th? t?t c? c¨¢c lu?t v¨¤ quy ??nh hi?n h¨¤nh. Vi?c s? d?ng m?ng l??i CapSolver cho c¨¢c ho?t ??ng b?t h?p ph¨¢p, gian l?n ho?c l?m d?ng l¨¤ ho¨¤n to¨¤n b? c?m v¨¤ s? b? ?i?u tra. C¨¢c gi?i ph¨¢p gi?i captcha c?a ch¨²ng t?i n?ng cao tr?i nghi?m ng??i d¨´ng trong khi ??m b?o tu?n th? 100% trong vi?c gi¨²p gi?i quy?t c¨¢c kh¨® kh?n v? captcha trong qu¨¢ tr¨¬nh thu th?p d? li?u c?ng khai. Ch¨²ng t?i khuy?n kh¨ªch vi?c s? d?ng d?ch v? c?a ch¨²ng t?i m?t c¨¢ch c¨® tr¨¢ch nhi?m. ?? bi?t th¨ºm th?ng tin, vui l¨°ng truy c?p ?i?u kho?n D?ch v? v¨¤ Ch¨ªnh s¨¢ch Quy?n ri¨ºng t?.
Th¨ºm

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