The user agent string userAgent can implement four identification functions: String useragent
Definition
User proxy string: navigator. userAgent
The HTTP specification clearly stipulates that the browser should send a brief user proxy string, specifying the browser name and version number. But in reality it is not that simple.
Development History
[1] in 1993, the
UserAgent and device, UserAgent Device
When a browser requests a webpage, A useragent (User Agent) is added before the url ).
PS: As a browser, you can do a lot of work on this useragent string. It can create many bugs or reduce many bugs. The only taste is yourself.
Let's talk about the distinction between Andr
Determine whether the UserAgent is from and whether the UserAgent is from
Iso:
Mozilla/5.0 (iPhone; CPU iPhone OS 7_0_4 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Mobile/11B554a MicroMessenger/6.2.4 NetType/WIFI Language/zh_CN
Android:
Mozilla/5.0 (Linux; U; Android 4.4.2; zh-cn; PE-TL20 Build/HuaweiPE-TL20) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 MQQBrowser/5.4 TBS/025440 Mobil
When using the CI framework, it is sometimes a problem to open the Web page and display only the disallowed Key characters error prompt. Some people say that there are illegal characters in the URL. But make sure the URL is plain English, the problem is still out. But after emptying the browser history and cookies. There's no problem with the refresh. Sometimes. Open a different browser. Some browsers may have problems. Some will not.
Resolves the
When you use the CI framework, there is sometimes a problem when you open a Web page and display only the disallowed Key Characters error message. Some people say that there are illegal characters in the URL. But the confirmation URL is pure English, the problem still comes out. But after emptying the browser history and cookies. Refresh is no problem. Sometimes. Open a different browser. Some browsers may have problems. Some will not.
To solve the C
When using the CI framework, you may encounter such a problem. When you open a webpage, only the error message "disallowed key characters" is displayed. Some people say that the URL contains invalid characters. But make sure that the URL is in English only. However, after clearing the browser history and cookies. Refresh. Sometimes. Open different browsers. Some browsers have problems. Some won't. Bo E baientertainment City
Solution: the error message
Open the CI framework of the source code is not difficult to find, in the CI of the core input class has such a function:
Copy Code code as follows:
function _clean_input_keys ($STR)
{
if (! Preg_match ("/^[a-z0-9:_\/-]+$/i", $str))
{
Exit (' Disallowed Key Characters. ');
}
Clean UTF-8 if supported
if (utf8_enabled = = TRUE)
{
$str = $this->uni->clean_string ($STR);
}
return $str;
}
This is filtered s
When using the CI framework, you may encounter such a problem. When you open a webpage, only the error message "Disallowed Key Characters" is displayed. Some people say that the url contains invalid characters. But make sure that the url is in English only. However, after clearing the browser history and cookies. Refresh. Sometimes. Open different browsers. Some browsers have problems. Some won't.
Solution: the error message "
When you use the CI framework, there is sometimes a problem when you open a Web page and display only the disallowed Key Characters error message. Some people say that there are illegal characters in the URL. But the confirmation URL is pure English, the problem still comes out. But after emptying the browser history and cookies. Refresh is no problem. Sometimes. Open a different browser. Some browsers may have problems. Some will not.To solve the Cod
When a URI passes a parameter in CI, it appears: The URI you submitted have disallowed characters. Error.
Cause: This is because there are characters in the URI that are not allowed by CI.
Workaround:In the config/config.php file, locateCopy the Code code as follows:$config [' permitted_uri_chars '] = ' A-Z 0-9~%.:_/-i ';
Add the allowed characters to the inside. If I need to add the @ symbol, you can:
Copy the code as follows: $config [' permitted_u
Encountered an error in learning Spring: note @resources: The annotation @Resources is disallowed forLater came in the knowledge of Java netizens to solve.The original code is this:1 Packagecom.show.biz;2 3 Importjavax.annotation.Resources;4 5 ImportCom.show.biz.UserBiz;6 ImportCom.show.dao.UserDAO;7 8 Public classUserbizimplbyannotationofresourceImplementsuserbiz {9 Ten //Annotate annotations on Userdao One@Resources (name= "Userdao")//or use @
When you run the asmcmd command, the following error occurs:
[Oracle @ racdb2 ~] $ Asmcmd
Asmcmd: Command disallowed by current instance type
The error message is obvious:
The instance type is incorrect.
RAC has two instances: Oracle instance and ASM instance.
The pfile parameter sets the Oracle instance, which is the default value. Therefore, Oracle instances are used if oracle_sid is not specified. However, the asmcmd command is for the ASM inst
In Ci, when the URI passes the parameter, it appears: The URI you submitted has disallowed characters. Error.Reason: This is because there are characters in the URI that are not allowed by CI.
Solution:In the config/config.php file, find
Copy Code code as follows:
$config [' permitted_uri_chars '] = ' A-Z 0-9~%.:_/-i ';
Add the allowed characters inside. If I need to add the @ symbol, you can do this:
Copy Code code as follows:
javascript is the primary language for front-end development, and we can write JavaScript programs to determine the type and version of the browser. JavaScript can determine browser types in general there are two ways, one is based on a variety of browser-specific properties to distinguish, the other is by analyzing the browser's useragent properties to judge. This paper analyzes the useragent characteristi
Web effects useragent Get user Browser type
var useragent = navigator.userAgent.toLowerCase ();
useragent property syntaxNavigator.useragent;UserAgent Property Description
Attribute descriptionappCodeName Gets the code name of the browser.appMinorVersion gets the minor version value of the application.AppNam
iOS and H5 interaction, H5 need to use useragent with some parameters, we need to modify the default useragent for the custom.First of all, to popularize the history of useragent, click useragent View.Search the Internet a lot of information. No one way is good, summed up, the following 2 methods are not useful:1, dire
The user agent Chinese name is the users proxy, is part of the HTTP protocol, is part of the header domain, the user agent is also referred to as UA. It is a special string header that provides access to the Web site with information such as the type and version of the browser you are using, the operating system and version, the browser kernel, and so on.Through this logo, users visit the site can display a different layout to provide users with better experience or information statistics, such
is attacked by CC, the principle is: The attacker uses the proxy server (meat machine) to generate a legitimate request to the victim host to achieve DDoS and camouflage. One feature of CC attacks is that their useragent are consistent, so they can be blocked by limiting the attacker's useragent approach.To edit a virtual host configuration file:[Email protected] 111.com]# vim/usr/local/apache2.4/conf/extr
The previous article "Web development compatibility series (I): useragent values for browsers of different devices" lists the useragent values of common computer browsers and smart phone browsers.
Here, we analyze the features of the browser's respective useragent and provide the judgment method:
Windows operating system browser series:
IE browser series:Featur
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