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Apache > HTTP Server > Documentation > Version 2.0 > Modules

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Directive Quick Reference

Available Languages: de | en | es | ja | ko | ru | tr

The directive quick reference shows the usage, default, status, and context of each Apache configuration directive. For more information about each of these, see the Directive Dictionary.

The first column gives the directive name and usage. The second columns shows the default value of the directive, if a default exists. If the default is too large to display, the first characters will be followed by "+".

The third and fourth columns list the contexts where the directive is allowed and the status of the directive according to the legend tables below.

A | B | C | D | E | F | G | H | I | K | L | M | N | O | P | R | S | T | U | V | W | X
sserver config
vvirtual host
ddirectory
h.htaccess
CCore
MMPM
BBase
EExtension
XExperimental
Method that Apache uses to serialize multiple children accepting requests on network sockets
Resources accept trailing pathname information
Name of the distributed configuration file
Activates a CGI script for a particular handler or content-type
Alternate text to display for a file, instead of an icon selected by filename
Alternate text to display for a file instead of an icon selected by MIME-encoding
Alternate text to display for a file, instead of an icon selected by MIME content-type
Maps the given filename extensions to the specified content charset
Default charset parameter to be added when a response content-type is text/plain or text/html
Description to display for a file
Maps the given filename extensions to the specified encoding type
Maps the filename extensions to the specified handler
Icon to display for a file selected by name
Icon to display next to files selected by MIME content-encoding
Icon to display next to files selected by MIME content-type
Maps filename extensions to the filters that will process client requests
Maps the given filename extension to the specified content language
Adds additional information to the module information displayed by the server-info handler
Maps filename extensions to the filters that will process responses from the server
assigns an output filter to a particular MIME-type
Maps the given filename extensions onto the specified content type
Maps URLs to filesystem locations
Maps URLs to filesystem locations using regular expressions
Controls which hosts can access an area of the server
Ports that are allowed to CONNECT through the proxy
Determines whether encoded path separators in URLs are allowed to be passed through
Types of directives that are allowed in .htaccess files
Specifies userIDs that are allowed access without password verification
Configures if authorization will fall-through to other methods
Sets whether the password entered will be logged in the error log
Specifies whether blank passwords are allowed
Sets whether the userID field may be empty
Sets whether to check the password field for a correctly formatted email address
Tie a virtual host to a user and group ID
Sets whether authorization and authentication are passed to lower level modules
Sets whether authentication and authorization will be passed on to lower level modules
Sets the name of the database file containing the list of user groups for authentication
Sets the type of database file that is used to store passwords
Sets thename of a database file containing the list of users and passwords for authentication
Selects the algorithm used to calculate the challenge and response hases in digest authentication
URIs that are in the same protection space for digest authentication
Location of the text file containing the list of users and encoded passwords for digest authentication
Name of the text file containing the list of groups for digest authentication
Enables or disables checking of the nonce-count sent by the server
Determines how the nonce is generated
How long the server nonce is valid
Determines the quality-of-protection to use in digest authentication
The amount of shared memory to allocate for keeping track of clients
Sets the name of a text file containing the list of user groups for authentication
Prevent other authentication modules from authenticating the user if this one fails
Optional DN to use in binding to the LDAP server
Password used in conjuction with the bind DN
Language to charset conversion configuration file
Use the LDAP server to compare the DNs
When will the module de-reference aliases
Turn on or off LDAP authentication
Allow LDAP authentication to work with MS FrontPage
LDAP attributes used to check for group membership
Use the DN of the client username when checking for group membership
Use the DN of the client username to set the REMOTE_USER environment variable
URL specifying the LDAP search parameters
Authorization realm for use in HTTP authentication
Type of user authentication
Sets the name of a text file containing the list of users and passwords for authentication
Sets environment variables conditional on HTTP User-Agent
Sets environment variables conditional on User-Agent without respect to case
Define the non-privileged account on BS2000 machines
Buffer log entries in memory before writing to disk
CacheDefaultExpire seconds 3600 (one hour) sv X
The default duration to cache a document when no expiry date is specified.
The number of characters in subdirectory names
The number of levels of subdirectories in the cache.
Disable caching of specified URLs
Enable caching of specified URLs using a specified storage manager
Indicates if the cache observes Expires dates when seeking files
Cache a list of file handles at startup time
Percentage of document served, after which the server will complete caching the file even if the request is cancelled.
The time to retain unchanged cached files that match a URL
The recurring time each day for garbage collection to be run. (24 hour clock)
The interval between garbage collection attempts.
The maximum kilobytes of memory used for garbage collection
The time to retain unreferenced cached files that match a URL.
Ignore the fact that the client requested the content not be cached.
Do not store the given HTTP header(s) in the cache.
Ignore the fact that a response has no Last Modified header.
The factor used to compute an expiry date based on the LastModified date.
CacheMaxExpire seconds 86400 (one day) sv X
The maximum time in seconds to cache a document
The maximum size (in bytes) of a document to be placed in the cache
The minimum size (in bytes) of a document to be placed in the cache
Allows content-negotiated documents to be cached by proxy servers
The directory root under which cache files are stored
CacheSize KBytes 1000000 sv X
The maximum amount of disk space that will be used by the cache in KBytes
The minimum time margin to cache a document
Technique for locating the interpreter for CGI scripts
Charset to translate into
CharsetOptions option [option] ... DebugLevel=0 NoImpl + svdh X
Configures charset translation behavior
Source charset of files
Enables the spelling module
Specify user ID and group ID for a number of child processes
Enables the generation of Content-MD5 HTTP Response headers
The domain to which the tracking cookie applies
Expiry time for the tracking cookie
Sets filename for the logging of cookies
CookieName token Apache svdh E
Name of the tracking cookie
Format of the cookie header field
Enables tracking cookie
Directory where Apache attempts to switch before dumping core
Sets filename and format of log file
Enable WebDAV HTTP methods
Allow PROPFIND, Depth: Infinity requests
Location of the DAV lock database
Minimum amount of time the server holds a lock on a DAV resource
Icon to display for files when no specific icon is configured
Sets all files in the given scope to the specified language
DefaultType MIME-type text/plain svdh C
MIME content-type that will be sent if the server cannot determine a type in any other way
Fragment size to be compressed at one time by zlib
How much compression do we apply to the output
Places the compression ratio in a note for logging
How much memory should be used by zlib for compression
Zlib compression window size
Controls which hosts are denied access to the server
Enclose a group of directives that apply only to the named file-system directory and sub-directories
List of resources to look for when the client requests a directory
Enclose directives that apply to file-system directories matching a regular expression and their subdirectories
Toggle trailing slash redirects on or off
DocumentRoot directory-path /usr/local/apache/h + sv C
Directory that forms the main document tree visible from the web
Dump all input data to the error log
Dump all output data to the error log
Enables a hook that runs exception handlers after a crash
Use memory-mapping to read files during delivery
Use the kernel sendfile support to deliver files to the client
What the server will return to the client in case of an error
ErrorLog file-path|syslog[:facility] logs/error_log (Uni + sv C
Location where the server will log errors
Example svdh X
Demonstration directive to illustrate the Apache module API
Enables generation of Expires headers
Value of the Expires header configured by MIME type
Default algorithm for calculating expiration time
Keep track of extended status information for each request
Define an external filter
ExtFilterOptions option [option] ... DebugLevel=0 NoLogS + d E
Configure mod_ext_filter options
FileETag component ... INode MTime Size svdh C
File attributes used to create the ETag HTTP response header
Contains directives that apply to matched filenames
Contains directives that apply to regular-expression matched filenames
Action to take if a single acceptable document is not found
Forces all matching files to be served with the specified MIME content-type
Sets filename of the forensic log
Group under which the server will answer requests
Configure HTTP response headers
Name of the file that will be inserted at the top of the index listing
Enables DNS lookups on client IP addresses
Enables logging of the RFC1413 identity of the remote user
Encloses directives that will be processed only if a test is true at startup
Encloses directives that are processed conditional on the presence or absence of a specific module
contains version dependent configuration
ImapBase map|referer|URL http://servername/ svdh B
Default base for imagemap files
Default action when an imagemap is called with coordinates that are not explicitly mapped
Action if no coordinates are given when calling an imagemap
Includes other configuration files from within the server configuration files
Adds to the list of files to hide when listing a directory
Various configuration settings for directory indexing
Sets the default ordering of the directory index
Record HSE_APPEND_LOG_PARAMETER requests from ISAPI extensions to the error log
Record HSE_APPEND_LOG_PARAMETER requests from ISAPI extensions to the query field
ISAPI .dll files to be loaded at startup
Fake asynchronous support for ISAPI callbacks
Log unsupported feature requests from ISAPI extensions
Size of the Read Ahead Buffer sent to ISAPI extensions
Enables HTTP persistent connections
Amount of time the server will wait for subsequent requests on a persistent connection
The precendence of language variants for cases where the client does not express a preference
Maximum number of entries in the primary LDAP cache
Time that cached items remain valid
Specifies the socket connection timeout in seconds
Number of entries used to cache LDAP compare operations
Time that entries in the operation cache remain valid
Sets the shared memory cache file
Size in bytes of the shared-memory cache
Sets the file containing the trusted Certificate Authority certificate or database
Specifies the type of the Certificate Authority file
Restrict enclosed access controls to only certain HTTP methods
Restrict access controls to all HTTP methods except the named ones
Determine maximum number of internal redirects and nested subrequests
Restricts the total size of the HTTP request body sent from the client
Limits the number of HTTP request header fields that will be accepted from the client
Limits the size of the HTTP request header allowed from the client
Limit the size of the HTTP request line that will be accepted from the client
Limits the size of an XML-based request body
IP addresses and ports that the server listens to
Maximum length of the queue of pending connections
Link in the named object file or library
Links in the object file or library, and adds to the list of active modules
Applies the enclosed directives only to matching URLs
Applies the enclosed directives only to regular-expression matching URLs
LockFile filename logs/accept.lock s M
Location of the accept serialization lock file
LogFormat format|nickname [nickname] "%h %l %u %t \"%r\" + sv B
Describes a format for use in a log file
LogLevel level warn sv C
Controls the verbosity of the ErrorLog
Maximum number of connections that will be processed simultaneously
Number of requests allowed on a persistent connection
Maximum amount of memory that the main allocator is allowed to hold without calling free()
Number of ranges allowed before returning the complete resource
Limit on the number of requests that an individual child server will handle during its life
Limit on the number of requests that an individual thread will handle during its life
Maximum number of idle child server processes
Maximum number of idle threads
Set the maximum number of worker threads
Maximum number of threads per child process
The maximum number of objects allowed to be placed in the cache
The maximum size (in bytes) of a document allowed in the cache
MCacheMaxStreamingBuffer size_in_bytes the smaller of 1000 + s X
Maximum amount of a streamed response to buffer in memory before declaring the response uncacheable
The minimum size (in bytes) of a document to be allowed in the cache
The algorithm used to select documents for removal from the cache
The maximum amount of memory used by the cache in KBytes
MetaDir directory .web svdh E
Name of the directory to find CERN-style meta information files
MetaFiles on|off off svdh E
Activates CERN meta-file processing
MetaSuffix suffix .meta svdh E
File name suffix for the file containg CERN-style meta information
Enable MIME-type determination based on file contents using the specified magic file
Minimum number of idle child server processes
Minimum number of idle threads available to handle request spikes
Map a list of files into memory at startup time
Tells mod_mime to treat path_info components as part of the filename
The types of files that will be included when searching for a matching file with MultiViews
Designates an IP address for name-virtual hosting
Hosts, domains, or networks that will be connected to directly
Total number of children alive at the same time
List of additional client certificates
Allows a connection to be upgraded to an SSL connection upon request
Configures what features are available in a particular directory
Order ordering Deny,Allow dh B
Controls the default access state and the order in which Allow and Deny are evaluated.
Passes environment variables from the shell
PidFile filename logs/httpd.pid s M
File where the server records the process ID of the daemon
Turn the echo server on or off
Container for directives applied to proxied resources
Determines how to handle bad header lines in a response
Words, hosts, or domains that are banned from being proxied
Default domain name for proxied requests
Override error pages for proxied content
Define the character set for proxied FTP listings
Determine size of internal data throughput buffer
Container for directives applied to regular-expression-matched proxied resources
Maximium number of proxies that a request can be forwarded through
Maps remote servers into the local server URL-space
Adjusts the URL in HTTP response headers sent from a reverse proxied server
Use incoming Host HTTP request header for proxy request
Network buffer size for proxied HTTP and FTP connections
Remote proxy used to handle certain requests
Remote proxy used to handle requests matched by regular expressions
Enables forward (standard) proxy requests
Network timeout for proxied requests
Information provided in the Via HTTP response header for proxied requests
Name of the file that will be inserted at the end of the index listing
TCP receive buffer size
Sends an external redirect asking the client to fetch a different URL
Sends an external redirect based on a regular expression match of the current URL
Sends an external permanent redirect asking the client to fetch a different URL
Sends an external temporary redirect asking the client to fetch a different URL
Removes any character set associations for a set of file extensions
Removes any content encoding associations for a set of file extensions
Removes any handler associations for a set of file extensions
Removes any input filter associations for a set of file extensions
Removes any language associations for a set of file extensions
Removes any output filter associations for a set of file extensions
Removes any content type associations for a set of file extensions
Configure HTTP request headers
Selects which authenticated users can access a resource
Sets the base URL for per-directory rewrites
Defines a condition under which rewriting will take place
Enables or disables runtime rewriting engine
Sets the name of the lock file used for RewriteMap synchronization
Sets the name of the file used for logging rewrite engine processing
Sets the verbosity of the log file used by the rewrite engine
Defines a mapping function for key-lookup
RewriteOptions Options MaxRedirects=10 svdh E
Sets some special options for the rewrite engine
Defines rules for the rewriting engine
Limits the CPU consumption of processes launched by Apache children
Limits the memory consumption of processes launched by Apache children
Limits the number of processes that can be launched by processes launched by Apache children
Satisfy Any|All All dh C
Interaction between host-level access control and user authentication
ScoreBoardFile file-path logs/apache_status s M
Location of the file used to store coordination data for the child processes
Activates a CGI script for a particular request method.
Maps a URL to a filesystem location and designates the target as a CGI script
Maps a URL to a filesystem location using a regular expression and designates the target as a CGI script
Technique for locating the interpreter for CGI scripts
Location of the CGI script error logfile
Maximum amount of PUT or POST requests that will be recorded in the scriptlog
ScriptLogLength bytes 10385760 sv B
Size limit of the CGI script logfile
ScriptSock file-path logs/cgisock sv B
The name of the socket to use for communication with the cgi daemon
Enables SSL encryption for the specified port
TCP buffer size
Email address that the server includes in error messages sent to the client
Alternate names for a host used when matching requests to name-virtual hosts
Upper limit on configurable number of processes
Hostname and port that the server uses to identify itself
Legacy URL pathname for a name-based virtual host that is accessed by an incompatible browser
ServerRoot directory-path /usr/local/apache s C
Base directory for the server installation
Configures the footer on server-generated documents
Configures the Server HTTP response header
Sets environment variables
Sets environment variables based on attributes of the request
Sets environment variables based on attributes of the request without respect to case
Forces all matching files to be processed by a handler
Sets the filters that will process client requests and POST input
Sets the filters that will process responses from the server
SSIEndTag tag "-->" sv B
String that ends an include element
SSIErrorMsg message "[an error occurred + svdh B
Error message displayed when there is an SSI error
SSIStartTag tag "<!--#" sv B
String that starts an include element
SSITimeFormat formatstring "%A, %d-%b-%Y %H:%M + svdh B
Configures the format in which date strings are displayed
String displayed when an unset variable is echoed
File of concatenated PEM-encoded CA Certificates for Client Auth
Directory of PEM-encoded CA Certificates for Client Auth
File of concatenated PEM-encoded CA CRLs for Client Auth
Directory of PEM-encoded CA CRLs for Client Auth
File of PEM-encoded Server CA Certificates
Server PEM-encoded X.509 Certificate file
Server PEM-encoded Private Key file
SSLCipherSuite cipher-spec ALL:!ADH:RC4+RSA:+H + svdh E
Cipher Suite available for negotiation in SSL handshake
SSL Engine Operation Switch
Option to prefer the server's cipher preference order
Option to enable support for insecure renegotiation
SSLMutex type none s E
Semaphore for internal mutual exclusion of operations
Configure various SSL engine run-time options
Type of pass phrase dialog for encrypted private keys
Configure usable SSL protocol flavors
File of concatenated PEM-encoded CA Certificates for Remote Server Auth
Directory of PEM-encoded CA Certificates for Remote Server Auth
File of concatenated PEM-encoded CA CRLs for Remote Server Auth
Directory of PEM-encoded CA CRLs for Remote Server Auth
SSLProxyCipherSuite cipher-spec ALL:!ADH:RC4+RSA:+H + svdh E
Cipher Suite available for negotiation in SSL proxy handshake
SSL Proxy Engine Operation Switch
File of concatenated PEM-encoded client certificates and keys to be used by the proxy
Directory of PEM-encoded client certificates and keys to be used by the proxy
Configure usable SSL protocol flavors for proxy usage
Type of remote server Certificate verification
Maximum depth of CA Certificates in Remote Server Certificate verification
Pseudo Random Number Generator (PRNG) seeding source
Allow access only when an arbitrarily complex boolean expression is true
Deny access when SSL is not used for the HTTP request
Type of the global/inter-process SSL Session Cache
Number of seconds before an SSL session expires in the Session Cache
Variable name to determine user name
Type of Client Certificate verification
Maximum depth of CA Certificates in Client Certificate verification
Number of child server processes created at startup
Number of threads created on startup
User and group for CGI programs to run as
Sets the upper limit on the configurable number of threads per child process
Number of threads created by each child process
Determine the stack size for each thread
TimeOut seconds 300 sv C
Amount of time the server will wait for certain events before failing a request
Determines the behaviour on TRACE requests
Specify location of a log file
TypesConfig file-path conf/mime.types s B
The location of the mime.types file
Removes variables from the environment
Configures how the server determines its own name and port
The userid under which the server will answer requests
UserDir directory-filename public_html sv B
Location of the user-specific directories
Dynamically configure the location of the document root for a given virtual host
Dynamically configure the location of the document root for a given virtual host
Contains directives that apply only to a specific hostname or IP address
Dynamically configure the location of the CGI directory for a given virtual host
Dynamically configure the location of the cgi directory for a given virtual host
Use accept() rather than AcceptEx() to accept network connections
Parse SSI directives in files with the execute bit set

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