PHP获取远程文件
if(!($contents=file_get_contents('http://finance.yahoo.com/d/quotes.csv?s=AMZN&e=.csv&f=slldltlclohgv'))){
die('fail to open yahoo');
};
echo $contents;
为什么平均要刷新3-4下才有一次成功,其他都会出现一个警告,提示 HTTP request failed!
------解决方案--------------------
- C/C++ code
Bart Friederichs 16-Apr-2012 12:17 file_get_contents can do a POST, create a context for that first: $opts = array('http' => array( 'method' => 'POST', 'header' => "Content-Type: text/xml\r\n". "Authorization: Basic ".base64_encode("$https_user:$https_password")."\r\n", 'content' => $body, 'timeout' => 60 ) ); $context = stream_context_create($opts); $url = 'https://'.$https_server; $result = file_get_contents($url, false, $context, -1, 40000); pperegrina 21-Dec-2011 11:30 For those having this problem when trying to get_file_contents(url): Warning: file_get_contents(url): failed to open stream: HTTP request failed! in xx on line yy If you are behind a SonicWall firewall, read this: https://bugs.php.net/bug.php?id=40197 (this little line: uncheck a box in the internal settings of the firewall labled "Enforce Host Tag Search with for CFS") Apparently by default SonicWall blocks any HTTP request without a "Host:" header, which is the case in the PHP get_file_contents(url) implementation. This is why, if you try to get the same URL from the same machine with cURL our wget, it works. I hope this will be useful to someone, it took me hours to find out :) godwraith01 at yahoo dot com 11-Oct-2011 04:16 I experienced a problem in using hostnames instead straight IP with some server destinations. If i use file_get_contents("www.jbossServer.example/app1",...) i will get an 'Invalid hostname' from the server i'm calling. This is because file_get_contents probably will rewrite your request after getting the IP, obtaining the same thing as : file_get_contents("xxx.yyy.www.zzz/app1",...) And you know that many servers will deny you access if you go through IP addressing in the request. With cURL this problem doesn't exists. It resolves the hostname leaving the request as you set it, so the server is not rude in response. <div class="clear"> </div>

PHPsessionshaveseverallimitations:1)Storageconstraintscanleadtoperformanceissues;2)Securityvulnerabilitieslikesessionfixationattacksexist;3)Scalabilityischallengingduetoserver-specificstorage;4)Sessionexpirationmanagementcanbeproblematic;5)Datapersis

负载均衡会影响会话管理,但可以通过会话复制、会话粘性和集中式会话存储解决。1.会话复制在服务器间复制会话数据。2.会话粘性将用户请求定向到同一服务器。3.集中式会话存储使用独立服务器如Redis存储会话数据,确保数据共享。

Sessionlockingisatechniqueusedtoensureauser'ssessionremainsexclusivetooneuseratatime.Itiscrucialforpreventingdatacorruptionandsecuritybreachesinmulti-userapplications.Sessionlockingisimplementedusingserver-sidelockingmechanisms,suchasReentrantLockinJ

PHP会话的替代方案包括Cookies、Token-basedAuthentication、Database-basedSessions和Redis/Memcached。1.Cookies通过在客户端存储数据来管理会话,简单但安全性低。2.Token-basedAuthentication使用令牌验证用户,安全性高但需额外逻辑。3.Database-basedSessions将数据存储在数据库中,扩展性好但可能影响性能。4.Redis/Memcached使用分布式缓存提高性能和扩展性,但需额外配

Sessionhijacking是指攻击者通过获取用户的sessionID来冒充用户。防范方法包括:1)使用HTTPS加密通信;2)验证sessionID的来源;3)使用安全的sessionID生成算法;4)定期更新sessionID。

本文比较了PHP和ASP.NET,重点是它们对大规模Web应用程序,性能差异和安全功能的适用性。两者对于大型项目都是可行的,但是PHP是开源和无关的,而ASP.NET,


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