curl常用的參數配置信息，足以解決溫飽

curl 是常用的命令行工具，用來請求 Web 服務器。它的名字就是客戶端（client）的 URL 工具的意思。熟練的話，完全可以取代 Postman 這一類的圖形界面工具。

-v參數輸出通信的整個過程，用於調試。

-A參數指定客戶端的用戶代理標頭，即User-Agent。curl 的默認用戶代理字符串是curl/[version]

-x參數指定 HTTP 請求的代理。

-X參數指定 HTTP 請求的方法。

可看到默認爲User-Agent爲 curl/7.50.3，使用後爲Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.204 Safari/534.16

[Administrator.SKY-20190610AAT] ➤ curl  -v  www.baidu.com
* Rebuilt URL to: www.baidu.com/
*   Trying 14.215.177.38...
* TCP_NODELAY set
* Connected to www.baidu.com (14.215.177.38) port 80 (#0)
> GET / HTTP/1.1
> Host: www.baidu.com
> User-Agent: curl/7.50.3
> Accept: */*
>
< HTTP/1.1 200 OK
< Accept-Ranges: bytes
< Cache-Control: private, no-cache, no-store, proxy-revalidate, no-transform
< Connection: keep-alive
< Content-Length: 2381
< Content-Type: text/html
< Date: Tue, 30 Jun 2020 14:11:18 GMT
< Etag: "588604dc-94d"
< Last-Modified: Mon, 23 Jan 2017 13:27:56 GMT
< Pragma: no-cache
< Server: bfe/1.0.8.18
< Set-Cookie: BDORZ=27315; max-age=86400; domain=.baidu.com; path=/
<
<!DOCTYPE html>
.......
[Administrator.SKY-20190610AAT] ➤ curl  -v -A 'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.204 Safari/534.16' www.baidu.com
* Rebuilt URL to: www.baidu.com/
*   Trying 14.215.177.38...
* TCP_NODELAY set
* Connected to www.baidu.com (14.215.177.38) port 80 (#0)
> GET / HTTP/1.1
> Host: www.baidu.com
> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.204 Safari/534.16
> Accept: */*
>

-O參數將服務器迴應保存成文件，並將 URL 的最後部分當作文件名.

-o參數將服務器的迴應保存成文件可指定文件名稱

--limit-rate用來限制 HTTP 請求和迴應的帶寬，模擬慢網速的環境（可以看到限制爲每秒200b時，整個請求響應時間爲14s）

[2020-06-30 22:33.58]  ~
[Administrator.SKY-20190610AAT] ➤ curl -v --limit-rate 500b www.baidu.com
* Rebuilt URL to: www.baidu.com/
*   Trying 14.215.177.39...
* TCP_NODELAY set
* Connected to www.baidu.com (14.215.177.39) port 80 (#0)
> GET / HTTP/1.1
> Host: www.baidu.com
> User-Agent: curl/7.50.3
> Accept: */*
>
< HTTP/1.1 200 OK
< Accept-Ranges: bytes
< Cache-Control: private, no-cache, no-store, proxy-revalidate, no-transform
< Connection: keep-alive
< Content-Length: 2381
< Content-Type: text/html
< Date: Tue, 30 Jun 2020 14:34:03 GMT
< Etag: "588604dd-94d"
< Last-Modified: Mon, 23 Jan 2017 13:27:57 GMT
< Pragma: no-cache
< Server: bfe/1.0.8.18
< Set-Cookie: BDORZ=27315; max-age=86400; domain=.baidu.com; path=/
<
<!DOCTYPE html>
<!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=http://s1.bdstatic.com/r/www/cache/bdorz/baidu.min.css><title>百度一下，你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=百度一下 class="bg s_btn"></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新聞</a> <a href=http://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地圖</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>視頻</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>貼吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&amp;tpl=mn&amp;u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登錄</a> </noscript> <script>document.write('<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登錄</a>');</script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多產品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>關於百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>&copy;2017&nbsp;Baidu&nbsp;<a href=http://www.baidu.com/duty/>使用百度前必讀</a>&nbsp; <a href=http://jianyi.baidu.com/ class=cp-feedback>意見反饋</a>&nbsp;京ICP證030173號&nbsp; <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>
* Curl_http_done: called premature == 0
* Connection #0 to host www.baidu.com left intact
                                                                                                                                   ✔
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
[2020-06-30 22:34.12]  ~
[Administrator.SKY-20190610AAT] ➤

-k參數指定跳過 SSL 檢測

-H參數添加 HTTP 請求的標頭

-F參數用來向服務器上傳二進制文件

-d參數可以讀取本地文本文件的數據，向服務器發送

-c參數將服務器設置的 Cookie 寫入一個文件

-b參數用來向服務器發送 Cookie 會讀取本地的

[Administrator.SKY-20190610AAT] ➤ curl -b 'foo1=bar;foo2=bar2' -v www.baidu.com -c cookie
* Rebuilt URL to: www.baidu.com/
*   Trying 14.215.177.39...
* TCP_NODELAY set
* Connected to www.baidu.com (14.215.177.39) port 80 (#0)
> GET / HTTP/1.1
> Host: www.baidu.com
> User-Agent: curl/7.50.3
> Accept: */*
> Cookie: foo1=bar;foo2=bar2
>
< HTTP/1.1 200 OK
< Accept-Ranges: bytes
< Cache-Control: private, no-cache, no-store, proxy-revalidate, no-transform
< Connection: keep-alive
< Content-Length: 2381
< Content-Type: text/html
< Date: Tue, 30 Jun 2020 14:54:17 GMT
< Etag: "588604d8-94d"
< Last-Modified: Mon, 23 Jan 2017 13:27:52 GMT
< Pragma: no-cache
< Server: bfe/1.0.8.18
* Added cookie BDORZ="27315" for domain baidu.com, path /, expire 1593615262
< Set-Cookie: BDORZ=27315; max-age=86400; domain=.baidu.com; path=/
<
<!DOCTYPE html>
<!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=http://s1.bdstatic.com/r/www/cache/bdorz/baidu.min.css><title>百度一下，你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=百度一下 class="bg s_btn"></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新聞</a> <a href=http://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地圖</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>視頻</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>貼吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&amp;tpl=mn&amp;u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登錄</a> </noscript> <script>document.write('<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登錄</a>');</script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多產品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>關於百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>&copy;2017&nbsp;Baidu&nbsp;<a href=http://www.baidu.com/duty/>使用百度前必讀</a>&nbsp; <a href=http://jianyi.baidu.com/ class=cp-feedback>意見反饋</a>&nbsp;京ICP證030173號&nbsp; <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>
* Curl_http_done: called premature == 0
* Connection #0 to host www.baidu.com left intact
                                                                                                                                   ✔
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
[2020-06-30 22:54.22]  ~
[Administrator.SKY-20190610AAT] ➤ ll
total 19
lrwxrwxrwx    1 Administ UsersGrp        33 Jun 16  2019 Desktop -> /drives/C/Users/ADMINI~1/Desktop/
lrwxrwxrwx    1 Administ UsersGrp        36 Jun 16  2019 LauncherFolder -> /drives/E/PROGRA~1/Mobatek/MOBAXT~1/
lrwxrwxrwx    1 Administ UsersGrp        34 Jun 16  2019 MyDocuments -> /drives/C/Users/ADMINI~1/DOCUME~1/
-rw-r--r--    1 Administ UsersGrp     12550 Jun 30 22:31 aa.txt
-rw-r--r--    1 Administ UsersGrp       183 Jun 30 22:54 cookie

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