Apache Module mod_proxy

BalancerGrowth Directive

This directive allows for growth potential in the number of Balancers available for a virtualhost in addition to the number pre-configured. It only takes effect if there is at least one pre-configured Balancer.

BalancerInherit Directive

This directive will cause the current server/vhost to "inherit" ProxyPass Balancers and Workers defined in the main server. This can cause issues and inconsistent behavior if using the Balancer Manager and so should be disabled if using that feature.

The setting in the global server defines the default for all vhosts.

BalancerMember Directive

This directive adds a member to a load balancing group. It can be used within a <Proxy balancer://...> container directive and can take any of the key value pair parameters available to ProxyPass directives.

One additional parameter is available only to BalancerMember directives: loadfactor. This is the member load factor - a decimal number between 1.0 (default) and 100.0, which defines the weighted load to be applied to the member in question.

The balancerurl is only needed when not within a <Proxy balancer://...> container directive. It corresponds to the url of a balancer defined in ProxyPass directive.

The path component of the balancer URL in any <Proxy balancer://...> container directive is ignored.

Trailing slashes should typically be removed from the URL of a BalancerMember.

BalancerPersist Directive

This directive will cause the shared memory storage associated with the balancers and balancer members to be persisted across restarts. This allows these local changes to not be lost during the normal restart/graceful state transitions.

NoProxy Directive

This directive is only useful for Apache httpd proxy servers within intranets. The NoProxy directive specifies a list of subnets, IP addresses, hosts and/or domains, separated by spaces. A request to a host which matches one or more of these is always served directly, without forwarding to the configured ProxyRemote proxy server(s).

ProxyRemote  "*"  "http://firewall.example.com:81"
NoProxy         ".example.com" "192.168.112.0/21"

The host arguments to the NoProxy directive are one of the following type list:

Domain

A Domain is a partially qualified DNS domain name, preceded by a period. It represents a list of hosts which logically belong to the same DNS domain or zone (i.e., the suffixes of the hostnames are all ending in Domain).

Examples

.com .example.org.

To distinguish Domains from Hostnames (both syntactically and semantically; a DNS domain can have a DNS A record, too!), Domains are always written with a leading period.

Note

Domain name comparisons are done without regard to the case, and Domains are always assumed to be anchored in the root of the DNS tree; therefore, the two domains .ExAmple.com and .example.com. (note the trailing period) are considered equal. Since a domain comparison does not involve a DNS lookup, it is much more efficient than subnet comparison.

SubNet

A SubNet is a partially qualified internet address in numeric (dotted quad) form, optionally followed by a slash and the netmask, specified as the number of significant bits in the SubNet. It is used to represent a subnet of hosts which can be reached over a common network interface. In the absence of the explicit net mask it is assumed that omitted (or zero valued) trailing digits specify the mask. (In this case, the netmask can only be multiples of 8 bits wide.) Examples:

192.168 or 192.168.0.0

the subnet 192.168.0.0 with an implied netmask of 16 valid bits (sometimes used in the netmask form 255.255.0.0)

192.168.112.0/21

the subnet 192.168.112.0/21 with a netmask of 21 valid bits (also used in the form 255.255.248.0)

As a degenerate case, a SubNet with 32 valid bits is the equivalent to an IPAddr, while a SubNet with zero valid bits (e.g., 0.0.0.0/0) is the same as the constant _Default_, matching any IP address.

IPAddr

A IPAddr represents a fully qualified internet address in numeric (dotted quad) form. Usually, this address represents a host, but there need not necessarily be a DNS domain name connected with the address.

Example

192.168.123.7

Note

An IPAddr does not need to be resolved by the DNS system, so it can result in more effective apache performance.

Hostname

A Hostname is a fully qualified DNS domain name which can be resolved to one or more IPAddrs via the DNS domain name service. It represents a logical host (in contrast to Domains, see above) and must be resolvable to at least one IPAddr (or often to a list of hosts with different IPAddrs).

Examples

prep.ai.example.edu
www.example.org

Note

In many situations, it is more effective to specify an IPAddr in place of a Hostname since a DNS lookup can be avoided. Name resolution in Apache httpd can take a remarkable deal of time when the connection to the name server uses a slow PPP link.

Hostname comparisons are done without regard to the case, and Hostnames are always assumed to be anchored in the root of the DNS tree; therefore, the two hosts WWW.ExAmple.com and www.example.com. (note the trailing period) are considered equal.

See also

• DNS Issues

<Proxy> Directive

Directives placed in <Proxy> sections apply only to matching proxied content. Shell-style wildcards are allowed.

For example, the following will allow only hosts in yournetwork.example.com to access content via your proxy server:

<Proxy "*">
  Require host yournetwork.example.com
</Proxy>

The following example will process all files in the foo directory of example.com through the INCLUDES filter when they are sent through the proxy server:

<Proxy "http://example.com/foo/*">
  SetOutputFilter INCLUDES
</Proxy>

See also

• <ProxyMatch>

Proxy100Continue Directive

This directive determines whether the proxy should forward 100-continue Expect:ation to the origin server and thus let it decide when/if the HTTP request body should be read, or when Off the proxy should generate 100 Continue intermediate response by itself before forwarding the request body.

ProxyAddHeaders Directive

This directive determines whether or not proxy related information should be passed to the backend server through X-Forwarded-For, X-Forwarded-Host and X-Forwarded-Server HTTP headers.

ProxyBadHeader Directive

The ProxyBadHeader directive determines the behavior of mod_proxy if it receives syntactically invalid response header lines (i.e. containing no colon) from the origin server. The following arguments are possible:

IsError

Abort the request and end up with a 502 (Bad Gateway) response. This is the default behavior.

Ignore

Treat bad header lines as if they weren't sent.

StartBody

When receiving the first bad header line, finish reading the headers and treat the remainder as body. This helps to work around buggy backend servers which forget to insert an empty line between the headers and the body.

ProxyBlock Directive

The ProxyBlock directive specifies a list of words, hosts and/or domains, separated by spaces. HTTP, HTTPS, and FTP document requests to sites whose names contain matched words, hosts or domains are blocked by the proxy server. The proxy module will also attempt to determine IP addresses of list items which may be hostnames during startup, and cache them for match test as well. That may slow down the startup time of the server.

ProxyBlock "news.example.com" "auctions.example.com" "friends.example.com"

Note that example would also be sufficient to match any of these sites.

Hosts would also be matched if referenced by IP address.

Note also that

ProxyBlock "*"

blocks connections to all sites.

ProxyDomain Directive

This directive is only useful for Apache httpd proxy servers within intranets. The ProxyDomain directive specifies the default domain which the apache proxy server will belong to. If a request to a host without a domain name is encountered, a redirection response to the same host with the configured Domain appended will be generated.

ProxyRemote  "*"  "http://firewall.example.com:81"
NoProxy         ".example.com" "192.168.112.0/21"
ProxyDomain     ".example.com"

ProxyErrorOverride Directive

This directive is useful for reverse-proxy setups where you want to have a common look and feel on the error pages seen by the end user. This also allows for included files (via mod_include's SSI) to get the error code and act accordingly. (Default behavior would display the error page of the proxied server. Turning this on shows the SSI Error message.)

This directive does not affect the processing of informational (1xx), normal success (2xx), or redirect (3xx) responses.

By default ProxyErrorOverride affects all responses with codes between 400 (including) and 600 (excluding).

ProxyErrorOverride  On

To change the default behavior, you can specify the status codes to consider, separated by spaces. If you do so, all other status codes will be ignored. You can only specify status codes, that are considered error codes: between 400 (including) and 600 (excluding).

ProxyErrorOverride  On 403 405 500 501 502 503 504

ProxyIOBufferSize Directive

The ProxyIOBufferSize directive adjusts the size of the internal buffer which is used as a scratchpad for the data between input and output. The size must be at least 512.

In almost every case, there's no reason to change that value.

If used with AJP, this directive sets the maximum AJP packet size in bytes. Values larger than 65536 are set to 65536. If you change it from the default, you must also change the packetSize attribute of your AJP connector on the Tomcat side! The attribute packetSize is only available in Tomcat 5.5.20+ and 6.0.2+

Normally it is not necessary to change the maximum packet size. Problems with the default value have been reported when sending certificates or certificate chains.

<ProxyMatch> Directive

The <ProxyMatch> directive is identical to the <Proxy> directive, except that it matches URLs using regular expressions.

From 2.4.8 onwards, named groups and backreferences are captured and written to the environment with the corresponding name prefixed with "MATCH_" and in upper case. This allows elements of URLs to be referenced from within expressions and modules like mod_rewrite. In order to prevent confusion, numbered (unnamed) backreferences are ignored. Use named groups instead.

<ProxyMatch "^http://(?<sitename>[^/]+)">
    Require ldap-group cn=%{env:MATCH_SITENAME},ou=combined,o=Example
</ProxyMatch>

See also

• <Proxy>

ProxyMaxForwards Directive

The ProxyMaxForwards directive specifies the maximum number of proxies through which a request may pass if there's no Max-Forwards header supplied with the request. This may be set to prevent infinite proxy loops or a DoS attack.

ProxyMaxForwards 15

Note that setting ProxyMaxForwards is a violation of the HTTP/1.1 protocol (RFC2616), which forbids a Proxy setting Max-Forwards if the Client didn't set it. Earlier Apache httpd versions would always set it. A negative ProxyMaxForwards value, including the default -1, gives you protocol-compliant behavior but may leave you open to loops.

ProxyPass Directive

This directive allows remote servers to be mapped into the space of the local server. The local server does not act as a proxy in the conventional sense but appears to be a mirror of the remote server. The local server is often called a reverse proxy or gateway. The path is the name of a local virtual path; url is a partial URL for the remote server and cannot include a query string.

In 2.4.7 and later, support for using a Unix Domain Socket is available by using a target which prepends unix:/path/lis.sock|. For example, to proxy HTTP and target the UDS at /home/www.socket, you would use unix:/home/www.socket|http://localhost/whatever/.

When used inside a <Location> section, the first argument is omitted and the local directory is obtained from the <Location>. The same will occur inside a <LocationMatch> section; however, ProxyPass does not interpret the regexp as such, so it is necessary to use ProxyPassMatch in this situation instead.

Suppose the local server has address http://example.com/; then

<Location "/mirror/foo/">
    ProxyPass "http://backend.example.com/"
</Location>

will cause a local request for http://example.com/mirror/foo/bar to be internally converted into a proxy request to http://backend.example.com/bar.

If you require a more flexible reverse-proxy configuration, see the RewriteRule directive with the [P] flag.

The following alternative syntax is possible; however, it can carry a performance penalty when present in very large numbers. The advantage of the below syntax is that it allows for dynamic control via the Balancer Manager interface:

ProxyPass "/mirror/foo/" "http://backend.example.com/"

The ! directive is useful in situations where you don't want to reverse-proxy a subdirectory, e.g.

<Location "/mirror/foo/">
    ProxyPass "http://backend.example.com/"
</Location>
<Location "/mirror/foo/i">
    ProxyPass "!"
</Location>

ProxyPass "/mirror/foo/i" "!"
ProxyPass "/mirror/foo" "http://backend.example.com"

will proxy all requests to /mirror/foo to backend.example.com except requests made to /mirror/foo/i.

Mixing ProxyPass settings in different contexts does not work:

ProxyPass "/mirror/foo/i" "!"
<Location "/mirror/foo/">
    ProxyPass "http://backend.example.com/"
</Location>

In this case, a request to /mirror/foo/i will get proxied, because the ProxyPass directive in the Location block will be evaluated first. The fact that ProxyPass supports both server and directory contexts does not mean that their scope and position in the configuration file will guarantee any ordering or override.

ProxyPass key=value Parameters

In Apache HTTP Server 2.1 and later, mod_proxy supports pooled connections to a backend server. Connections created on demand can be retained in a pool for future use. Limits on the pool size and other settings can be coded on the ProxyPass directive using key=value parameters, described in the tables below.

Use the ttl parameter to set an optional time to live; connections which have been unused for at least ttl seconds will be closed. ttl can be used to avoid using a connection which is subject to closing because of the backend server's keep-alive timeout.

ProxyPass "/example" "http://backend.example.com" max=20 ttl=120 retry=300

If the Proxy directive scheme starts with the balancer:// (eg: balancer://cluster, any path information is ignored), then a virtual worker that does not really communicate with the backend server will be created. Instead, it is responsible for the management of several "real" workers. In that case, the special set of parameters can be added to this virtual worker. See mod_proxy_balancer for more information about how the balancer works.

A sample balancer setup:

ProxyPass "/special-area" "http://special.example.com" smax=5 max=10
ProxyPass "/" "balancer://mycluster/" stickysession=JSESSIONID|jsessionid nofailover=On
<Proxy "balancer://mycluster">
    BalancerMember "ajp://1.2.3.4:8009"
    BalancerMember "ajp://1.2.3.5:8009" loadfactor=20
    # Less powerful server, don't send as many requests there,
    BalancerMember "ajp://1.2.3.6:8009" loadfactor=5
</Proxy>

Configuring hot spares can help ensure that a certain number of workers are always available for use per load balancer set:

ProxyPass "/" "balancer://sparecluster/"
<Proxy balancer://sparecluster>
    BalancerMember ajp://1.2.3.4:8009
    BalancerMember ajp://1.2.3.5:8009
    # The servers below are hot spares. For each server above that is unusable
    # (draining, stopped, unreachable, in error state, etc.), one of these spares
    # will be used in its place. Two servers will always be available for a request
    # unless one or more of the spares is also unusable.
    BalancerMember ajp://1.2.3.6:8009 status=+R
    BalancerMember ajp://1.2.3.7:8009 status=+R
</Proxy>

Setting up a hot-standby that will only be used if no other members (or spares) are available in the load balancer set:

ProxyPass "/" "balancer://hotcluster/"
<Proxy "balancer://hotcluster">
    BalancerMember "ajp://1.2.3.4:8009" loadfactor=1
    BalancerMember "ajp://1.2.3.5:8009" loadfactor=2.25
    # The server below is on hot standby
    BalancerMember "ajp://1.2.3.6:8009" status=+H
    ProxySet lbmethod=bytraffic
</Proxy>

Additional ProxyPass Keywords

Normally, mod_proxy will canonicalise ProxyPassed URLs. But this may be incompatible with some backends, particularly those that make use of PATH_INFO. The optional nocanon keyword suppresses this and passes the URL path "raw" to the backend. Note that this keyword may affect the security of your backend, as it removes the normal limited protection against URL-based attacks provided by the proxy.

Normally, mod_proxy will include the query string when generating the SCRIPT_FILENAME environment variable. The optional noquery keyword (available in httpd 2.4.1 and later) prevents this.

The optional interpolate keyword, in combination with ProxyPassInterpolateEnv, causes the ProxyPass to interpolate environment variables, using the syntax ${VARNAME}. Note that many of the standard CGI-derived environment variables will not exist when this interpolation happens, so you may still have to resort to mod_rewrite for complex rules. Also note that interpolation is supported within the scheme/hostname/port portion of a URL only for variables that are available when the directive is parsed (like Define). Dynamic determination of those fields can be accomplished with mod_rewrite. The following example describes how to use mod_rewrite to dynamically set the scheme to http or https:

RewriteEngine On

RewriteCond "%{HTTPS}" =off
RewriteRule "." "-" [E=protocol:http]
RewriteCond "%{HTTPS}" =on
RewriteRule "." "-" [E=protocol:https]

RewriteRule "^/mirror/foo/(.*)" "%{ENV:protocol}://backend.example.com/$1" [P]
ProxyPassReverse  "/mirror/foo/" "http://backend.example.com/"
ProxyPassReverse  "/mirror/foo/" "https://backend.example.com/"

ProxyPassInherit Directive

This directive will cause the current server/vhost to "inherit" ProxyPass directives defined in the main server. This can cause issues and inconsistent behavior if using the Balancer Manager for dynamic changes and so should be disabled if using that feature.

The setting in the global server defines the default for all vhosts.

Disabling ProxyPassInherit also disables BalancerInherit.

ProxyPassInterpolateEnv Directive

This directive, together with the interpolate argument to ProxyPass, ProxyPassReverse, ProxyPassReverseCookieDomain, and ProxyPassReverseCookiePath, enables reverse proxies to be dynamically configured using environment variables which may be set by another module such as mod_rewrite. It affects the ProxyPass, ProxyPassReverse, ProxyPassReverseCookieDomain, and ProxyPassReverseCookiePath directives and causes them to substitute the value of an environment variable varname for the string ${varname} in configuration directives if the interpolate option is set.

The scheme/hostname/port portion of ProxyPass may contain variables, but only the ones available when the directive is parsed (for example, using Define). For all the other use cases, please consider using mod_rewrite instead.

ProxyPassMatch Directive

This directive is equivalent to ProxyPass but makes use of regular expressions instead of simple prefix matching. The supplied regular expression is matched against the url, and if it matches, the server will substitute any parenthesized matches into the given string and use it as a new url.

Suppose the local server has address http://example.com/; then

ProxyPassMatch "^/(.*\.gif)$" "http://backend.example.com/$1"

will cause a local request for http://example.com/foo/bar.gif to be internally converted into a proxy request to http://backend.example.com/foo/bar.gif.

ProxyPassMatch "^(/.*\.gif)$" "http://backend.example.com:8000$1"

ProxyPassMatch "^/(.*\.gif)$" "http://backend.example.com:8000/$1"

The ! directive is useful in situations where you don't want to reverse-proxy a subdirectory.

When used inside a <LocationMatch> section, the first argument is omitted and the regexp is obtained from the <LocationMatch>.

If you require a more flexible reverse-proxy configuration, see the RewriteRule directive with the [P] flag.

ProxyPassReverse Directive

This directive lets Apache httpd adjust the URL in the Location, Content-Location and URI headers on HTTP redirect responses. This is essential when Apache httpd is used as a reverse proxy (or gateway) to avoid bypassing the reverse proxy because of HTTP redirects on the backend servers which stay behind the reverse proxy.

Only the HTTP response headers specifically mentioned above will be rewritten. Apache httpd will not rewrite other response headers, nor will it by default rewrite URL references inside HTML pages. This means that if the proxied content contains absolute URL references, they will bypass the proxy. To rewrite HTML content to match the proxy, you must load and enable mod_proxy_html.

path is the name of a local virtual path; url is a partial URL for the remote server. These parameters are used the same way as for the ProxyPass directive.

For example, suppose the local server has address http://example.com/; then

ProxyPass         "/mirror/foo/" "http://backend.example.com/"
ProxyPassReverse  "/mirror/foo/" "http://backend.example.com/"
ProxyPassReverseCookieDomain  "backend.example.com"  "public.example.com"
ProxyPassReverseCookiePath  "/"  "/mirror/foo/"

will not only cause a local request for the http://example.com/mirror/foo/bar to be internally converted into a proxy request to http://backend.example.com/bar (the functionality which ProxyPass provides here). It also takes care of redirects which the server backend.example.com sends when redirecting http://backend.example.com/bar to http://backend.example.com/quux . Apache httpd adjusts this to http://example.com/mirror/foo/quux before forwarding the HTTP redirect response to the client. Note that the hostname used for constructing the URL is chosen in respect to the setting of the UseCanonicalName directive.

Note that this ProxyPassReverse directive can also be used in conjunction with the proxy feature (RewriteRule ... [P]) from mod_rewrite because it doesn't depend on a corresponding ProxyPass directive.

The optional interpolate keyword, used together with ProxyPassInterpolateEnv, enables interpolation of environment variables specified using the format ${VARNAME}. Note that interpolation is not supported within the scheme portion of a URL.

When used inside a <Location> section, the first argument is omitted and the local directory is obtained from the <Location>. The same occurs inside a <LocationMatch> section, but will probably not work as intended, as ProxyPassReverse will interpret the regexp literally as a path; if needed in this situation, specify the ProxyPassReverse outside the section or in a separate <Location> section.

This directive is not supported in <Directory> or <Files> sections.

ProxyPassReverseCookieDomain Directive

Usage is basically similar to ProxyPassReverse, but instead of rewriting headers that are a URL, this rewrites the domain string in Set-Cookie headers.

ProxyPassReverseCookiePath Directive

Useful in conjunction with ProxyPassReverse in situations where backend URL paths are mapped to public paths on the reverse proxy. This directive rewrites the path string in Set-Cookie headers. If the beginning of the cookie path matches internal-path, the cookie path will be replaced with public-path.

In the example given with ProxyPassReverse, the directive:

ProxyPassReverseCookiePath  "/"  "/mirror/foo/"

will rewrite a cookie with backend path / (or /example or, in fact, anything) to /mirror/foo/.

ProxyPreserveHost Directive

When enabled, this option will pass the Host: line from the incoming request to the proxied host, instead of the hostname specified in the ProxyPass line.

This option should normally be turned Off. It is mostly useful in special configurations like proxied mass name-based virtual hosting, where the original Host header needs to be evaluated by the backend server.

ProxyReceiveBufferSize Directive

The ProxyReceiveBufferSize directive specifies an explicit (TCP/IP) network buffer size for proxied HTTP and FTP connections, for increased throughput. It has to be greater than 512 or set to 0 to indicate that the system's default buffer size should be used.

ProxyReceiveBufferSize 2048

ProxyRemote Directive

This defines remote proxies to this proxy. match is either the name of a URL-scheme that the remote server supports, or a partial URL for which the remote server should be used, or * to indicate the server should be contacted for all requests. remote-server is a partial URL for the remote server. Syntax:

scheme is effectively the protocol that should be used to communicate with the remote server; only http and https are supported by this module. When using https, the requests are forwarded through the remote proxy using the HTTP CONNECT method.

ProxyRemote "http://goodguys.example.com/" "http://mirrorguys.example.com:8000"
ProxyRemote "*" "http://cleverproxy.localdomain"
ProxyRemote "ftp" "http://ftpproxy.mydomain:8080"

In the last example, the proxy will forward FTP requests, encapsulated as yet another HTTP proxy request, to another proxy which can handle them.

This option also supports reverse proxy configuration; a backend webserver can be embedded within a virtualhost URL space even if that server is hidden by another forward proxy.

ProxyRemoteMatch Directive

The ProxyRemoteMatch is identical to the ProxyRemote directive, except that the first argument is a regular expression match against the requested URL.

ProxyRequests Directive

This allows or prevents Apache httpd from functioning as a forward proxy server. (Setting ProxyRequests to Off does not disable use of the ProxyPass directive.)

In a typical reverse proxy or gateway configuration, this option should be set to Off.

In order to get the functionality of proxying HTTP or FTP sites, you need also mod_proxy_http or mod_proxy_ftp (or both) present in the server.

In order to get the functionality of (forward) proxying HTTPS sites, you need mod_proxy_connect enabled in the server.

See also

• Forward and Reverse Proxies/Gateways

ProxySet Directive

This directive is used as an alternate method of setting any of the parameters available to Proxy balancers and workers normally done via the ProxyPass directive. If used within a <Proxy balancer url|worker url> container directive, the url argument is not required. As a side effect the respective balancer or worker gets created. This can be useful when doing reverse proxying via a RewriteRule instead of a ProxyPass directive.

<Proxy "balancer://hotcluster">
    BalancerMember "http://www2.example.com:8080" loadfactor=1
    BalancerMember "http://www3.example.com:8080" loadfactor=2
    ProxySet lbmethod=bytraffic
</Proxy>

<Proxy "http://backend">
    ProxySet keepalive=On
</Proxy>

ProxySet "balancer://foo" lbmethod=bytraffic timeout=15

ProxySet "ajp://backend:7001" timeout=15

ProxySourceAddress Directive

This directive allows to set a specific local address to bind to when connecting to a backend server.

ProxyStatus Directive

This directive determines whether or not proxy loadbalancer status data is displayed via the mod_status server-status page.

ProxyTimeout Directive

This directive allows a user to specify a timeout on proxy requests. This is useful when you have a slow/buggy appserver which hangs, and you would rather just return a timeout and fail gracefully instead of waiting however long it takes the server to return.

ProxyVia Directive

This directive controls the use of the Via: HTTP header by the proxy. Its intended use is to control the flow of proxy requests along a chain of proxy servers. See RFC 2616 (HTTP/1.1), section 14.45 for an explanation of Via: header lines.

• If set to Off, which is the default, no special processing is performed. If a request or reply contains a Via: header, it is passed through unchanged.
• If set to On, each request and reply will get a Via: header line added for the current host.
• If set to Full, each generated Via: header line will additionally have the Apache httpd server version shown as a Via: comment field.
• If set to Block, every proxy request will have all its Via: header lines removed. No new Via: header will be generated.