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如何发送Head请求
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我們要測試某個url是否有效，不需要把文件下載下來，只需要發送HEAD請求，獲得文件頭即可，下面是兩種獲取文件頭的方式：?
1.使用curl
root@vs-3310-099:/var/lib/mysql#?curl?-X?"HEAD"?-v?http://ftp.iij.ad.jp/pub/db/mysql/Downloads/MySQL-5.5/MySQL-client-5.5.14-1.linux2.6.x86_64.rpm?*?About?to?connect()?to?ftp.iij.ad.jp?port?80?(#0)?*???Trying?202.232.140.135...?connected?*?Connected?to?ftp.iij.ad.jp?(202.232.140.135)?port?80?(#0)?>?HEAD?/pub/db/mysql/Downloads/MySQL-5.5/MySQL-client-5.5.14-1.linux2.6.x86_64.rpm?HTTP/1.1?>?User-Agent:?curl/7.19.7?(x86_64-pc-linux-gnu)?libcurl/7.19.7?OpenSSL/0.9.8k?zlib/1.2.3.3?libidn/1.15?>?Host:?ftp.iij.ad.jp?>?Accept:?*/*?>??<?HTTP/1.1?200?OK?<?Date:?Wed,?13?Jul?2011?04:24:15?GMT?<?Server:?Apache?<?Last-Modified:?Tue,?05?Jul?2011?15:22:10?GMT?<?ETag:?"3bafc115-10e92cd-c29cc80"?<?Accept-Ranges:?bytes?<?Content-Length:?17732301?<?Connection:?close?<?Content-Type:?application/x-rpm?<??*?transfer?closed?with?17732301?bytes?remaining?to?read?*?Closing?connection?#0?curl:?(18)?transfer?closed?with?17732301?bytes?remaining?to?read? 2.telnet
?
root@vs-3310-099:/var/lib/mysql#?telnet?ftp.iij.ad.jp?80??Trying?202.232.140.138...?Connected?to?ftp.iij.ad.jp.?Escape?character?is?'^]'.?HEAD?/pub/db/mysql/Downloads/MySQL-5.5/MySQL-client-5.5.14-1.linux2.6.x86_64.rpm?HTTP/1.1?HOST:?ftp.iij.ad.jp???HTTP/1.1?200?OK?Date:?Wed,?13?Jul?2011?04:28:02?GMT?Server:?Apache?Last-Modified:?Tue,?05?Jul?2011?15:22:10?GMT?ETag:?"3bafc115-10e92cd-c29cc80"?Accept-Ranges:?bytes?Content-Length:?17732301?Connection:?close?Content-Type:?application/x-rpm???Connection?closed?by?foreign?host.? ?
轉載于:https://blog.51cto.com/yifangyou/609976
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