Resume at breakpoint and continue downloading/uploading from the specified position in the file header; offset is the starting position of resume transmission. If the offset value is "-", curl will automatically identify the starting position from the file and start transmission;
curl -# -o centos6.8.iso -C - http://mirrors. aliyun.com/centos/6.8/isos/x86_64/CentOS-6.8-x86_64-minimal.iso
curl -C -O http://www.linux.com/dodo1.JPG

2. Upload file (option: -T)

3. Forged source page | fake referer | hot link (option: -e)

#This will make the server think that you clicked a link from www.linux.com
curl -e "www.linux.com" http://mail.linux. com
#Tell Aiezu that I am from Baidu
curl -e http://baidu.com http://aiezu.com

4、 Fake proxy device (imitation browser)

curl -A "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.0)" http://www.linux.com
#Tell I love the E family, I am a GOOGLE crawler spider (actually I am the curl command)
curl -A "Mozilla/5.0 (compatible; Googlebot/2.1; http://www.google.com/bot.html)" http: //aiezu.com
#Tell Aiezu that I use WeChat’s built-in browser
curl -A "Mozilla/5.0 AppleWebKit/600 Mobile MicroMessenger/6.0" http://aiezu.com

5. Set http request

curl -H "Cache-Control:no-cache" http://aiezu.com

#It is often needed to access the Internet. To the proxy server (for example, when you use a proxy server to access the Internet or your IP address is blocked by others because you use curl on other people's websites), fortunately curl supports setting the proxy by using the built-in option: -x
curl -x 192.168.100.100 :1080 http://www.linux.com

6, http response header

6.1. View the http response header (option:-I)
# See what the http header of this site looks like
curl -I http://aiezu.com
Output:
HTTP/1.1 200 OK
Date: Fri, 25 Nov 2016 16:45:49 GMT
Server: Apache
Set-Cookie: rox__Session=abdrt8vesprhnpc3f63p1df7j4; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Vary : Accept-Encoding
Content-Type: text/html; charset=utf-8

6.2. Save the header information in the http response (option:-D)
curl -D cookied. txt http://www.linux.com
After execution, the cookie information is saved in cookied.txt
Note: The cookies generated by -c (lowercase) are different from the cookies in -D.

7. Send form data

curl -F "pic=@logo.png" -F "site=aiezu" http:/ /aiezu.com/

8、cookie

8.1、Send cookie(option:-b)
#Some websites use Cookie to record session information. For browsers like chrome, cookie information can be easily processed, but cookies can also be easily processed by adding relevant parameters in curl
curl -b "domain=aiezu.com" http://aiezu.com
#Many websites monitor your cookie information to determine whether you are visiting their website according to the rules, so we need to use the saved cookie information. Built-in option: -b
curl -b cookiec.txt http://www.linux.com

8.2. Save the cookie information in the http response (option:-c)
After executing http The cookie information in the response is saved in cookiec.txt
curl -c cookiec.txt http://www.linux.com

9. Test a URL

9.1. Test whether a URL is reachable
curl -v http://www.linux.com

9.2. Test the return value of the web page (option: -w [format])
curl -o /dev/null -s -w %{http_code} www.linux.com

10. Save the visited web page (> >)

2.1: Save using the redirection function of linux
curl http://www.linux.com >> linux.html

11. Request method

curl -i -v -H '' -X POST -d '' http:www.test.com/a/b
Among them, -X POST -d, -X GET -d, -X PUT -d are equivalent to -F, -G -d, -P respectively

Take post request as an example:
11.1 , -X POST -d
(11.1.1), POST application/x-www-form-urlencoded
application/x-www-form-urlencoded is the default
curl -X POST -d "param1 =value1¶m2=value2" http://localhost:3000/data
Equivalent to
curl -H "Content-Type:application/x-www-form-urlencoded" -X POST -d "param1=value1¶m2 =value2" http://localhost:3000/data
Using data files
curl -X POST -d "@data.txt" http://localhost:3000/data
where data.txt content As follows: param1=value1¶m2=value2

(11.1.2), POST application/json
curl -H "Content-Type:application/json" -X POST -d '{"key1":" value1","key2":"value2"}' http://localhost:3000/data
If using data files:
curl -X POST -d "@data.json" http://localhost: 3000/data
The content of data.json is as follows: {"key1":"value1","key2":"value2"}
Another example:
curl -H "Content-type:application /json" -X POST -d "{\"app_key\":\"$appKey\",\"time_stamp\":\"$time\"}" http://www.test.com.cn/a /b

11.2、-F
curl -v -H "token: 222" -F "file=@/Users/funglio/Downloads/401.png" localhost:8000/api/v1/upimg

curl -f http://www.linux.com/error

11.3, other examples

(11.3.1),

curl -X POST "http://www.test.com/e/f" -H "Content-Type:application/x-www-form-urlencoded;charset=UTF-8" \
-d "a=b" \
-d "c=d" \
-d "e=f" \
-d "g=h"

(11.3.2), error: curl -i -G -d "a=b#1&c=d" http://www.test.com/e/f
Correct: Use urlencode to convert parameter values ??that are special symbols
curl -i -G -d "a=b#1&c=d" http://www.test.com/e/f

12. Debugging

curl -v可以顯示一次http通信的整個(gè)過(guò)程，包括端口連接和http request頭信息。
如果覺(jué)得還不夠，那么下面的命令可以查看更詳細(xì)的通信過(guò)程：
curl --trace output.txt www.baidu.com 或者 curl --trace-ascii output.txt www.baidu.com?
運(yùn)行后，請(qǐng)打開output.txt文件查看。
curl --trace output.txt ?http://www.baidu.com
curl --trace-ascii output2.txt ?http://www.baidu.com
curl --trace output3.txt --trace-time http://www.baidu.com
curl --trace-ascii output4.txt --trace-time http://www.baidu.com?

舉例:有需求每5分鐘請(qǐng)求一次http://www.test.com/a/b生成一個(gè)日志文件。希望一月的日志(正確的和錯(cuò)誤的)能寫入一個(gè)日志文件
day=`date +%F`
logfile='/var/logs/www.test.com_'`date +%Y%m`'.log'
/usr/bin/echo -e "\n\n[${day}] Start request \n " >> ${logfile}
/bin/curl?-v?"http://www.test.com/a/b" -d "ccccc" 1>> ${logfile} 2>> ${logfile}?--trace-time
/usr/bin/echo -e "\n\n[${day}] End request\n" >> ${logfile}

13、顯示抓取錯(cuò)誤

curl -f http://www.linux.com/error

相關(guān)推薦：《Linux視頻教程》

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