Normal string-valued functions take one string as argument and return a string. Functions names are not case sensitive. Modules may register additional functions.
The grep command tells the machine to only display entries with the GET request. You can substitute other Apache commands as well. For example, if you’re looking to monitor access to.jpg images, you could substitute.jpg for GET. As before, use the actual path to your server’s log file. Maven dependencies. We use maven to manage our dependencies and are using Apache HttpClient version 4.5. Add the following dependency to your project in order to make HTTP Get request method.
|Get HTTP request header; header names may be added to the Vary header, see below|
|Same as |
|Get HTTP response header (most response headers will not yet be set during |
|Lookup request environment variable (as a shortcut, ||ordering|
|Lookup operating system environment variable|
|Lookup request note||ordering|
|Return first match of ||ordering|
|Convert string to lower case|
|Convert string to upper case|
|Escape special characters in %hex encoding|
|Unescape %hex encoded string, leaving encoded slashes alone; return empty string if %00 is found|
|Encode the string using base64 encoding|
|Decode base64 encoded string, return truncated string if 0x00 is found|
|Hash the string using MD5, then encode the hash with hexadecimal encoding|
|Hash the string using SHA1, then encode the hash with hexadecimal encoding|
|Read contents from a file (including line endings, when present)||restricted|
|Return last modification time of a file (or 0 if file does not exist or is not regular file)||restricted|
|Return size of a file (or 0 if file does not exist or is not regular file)||restricted|
The functions marked as 'restricted' in the final column are not available in some modules like
The functions marked as 'ordering' in the final column require some consideration for the ordering of different components of the server, especially when the function is used within the <
If> directive which is evaluated relatively early.
Environment variable orderingWhen environment variables are looked up within an <
If> condition, it's important to consider how extremely early in request processing that this resolution occurs. As a guideline, any directive defined outside of virtual host context (directory, location, htaccess) is not likely to have yet had a chance to execute.
SetEnvIfin virtual host scope is one directive that runs prior to this resolution
reqenvis used outside of <
If>, the resolution will generally occur later, but the exact timing depends on the directive the expression has been used within.
When the functions
http are used, the header name will automatically be added to the Vary header of the HTTP response, except where otherwise noted for the directive accepting the expression. The
req_novary function can be used to prevent names from being added to the Vary header.
Apache Http Client Example Scala
In addition to string-valued functions, there are also list-valued functions which take one string as argument and return a wordlist, i.e. a list of strings. The wordlist can be used with the special
-in operator. Functions names are not case sensitive. Modules may register additional functions.
Apache Http Get Examples
There are no built-in list-valued functions.
PeerExtList. See the description of
SSLRequire for details (but
PeerExtList is also usable outside of
Running several name-based web sites on a single IP address.
Your server has multiple hostnames that resolve to a single address, and you want to respond differently for
Creating virtual host configurations on your Apache server does not magically cause DNS entries to be created for those host names. You must have the names in DNS, resolving to your IP address, or nobody else will be able to see your web site. You can put entries in your
hosts file for local testing, but that will work only from the machine with those
The asterisks match all addresses, so the main server serves no requests. Due to the fact that the virtual host with
ServerName www.example.com is first in the configuration file, it has the highest priority and can be seen as the default or primary server. That means that if a request is received that does not match one of the specified
ServerName directives, it will be served by this first
The above configuration is what you will want to use in almost all name-based virtual hosting situations. The only thing that this configuration will not work for, in fact, is when you are serving different content based on differing IP addresses or ports.
You may replace
* with a specific IP address on the system. Such virtual hosts will only be used for HTTP requests received on connection to the specified IP address.
Apache Http Get Example Code
However, it is additionally useful to use
* on systems where the IP address is not predictable - for example if you have a dynamic IP address with your ISP, and you are using some variety of dynamic DNS solution. Since
* matches any IP address, this configuration would work without changes whenever your IP address changes.