Note that this ProxyPassReverse directive can also be used in conjunction with the proxy feature RewriteRule Note that interpolation is not supported within the scheme portion of a URL. Usage is basically similar to ProxyPassReverse , but instead of rewriting headers that are a URL, this rewrites the domain string in Set-Cookie headers. 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:.
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.
It has to be greater than or set to 0 to indicate that the system's default buffer size should be used. This defines remote proxies to this proxy.
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. The ProxyRemoteMatch is identical to the ProxyRemote directive, except that the first argument is a regular expression match against the requested URL.
This allows or prevents Apache httpd from functioning as a forward proxy server. In a typical reverse proxy or gateway configuration, this option should be set to Off. 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.
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. Keep in mind that the same parameter key can have a different meaning depending whether it is applied to a balancer or a worker, as shown by the two examples above regarding timeout. This directive allows to set a specific local address to bind to when connecting to a backend server.
This directive allows a user to specify a timeout on proxy requests. Its intended use is to control the flow of proxy requests along a chain of proxy servers. Copyright The Apache Software Foundation. Licensed under the Apache License, Version 2. Warning Do not enable proxying with ProxyRequests until you have secured your server.
Basic Examples The examples below are only a very basic idea to help you get started. Access via Handler You can also force a request to be handled as a reverse-proxy request, by creating a suitable Handler pass-through. Workers The proxy manages the configuration of origin servers and their communication parameters in objects called workers. DNS resolution for origin domains DNS resolution happens when the socket to the origin domain is created for the first time. Slow Startup If you're using the ProxyBlock directive, hostnames' IP addresses are looked up and cached during startup for later match test.
Intranet Proxy An Apache httpd proxy server situated in an intranet needs to forward external requests through the company's firewall for this, configure the ProxyRemote directive to forward the respective scheme to the firewall proxy. X-Forwarded-Server The hostname of the proxy server. The setting in the global server defines the default for all vhosts. Note Domain name comparisons are done without regard to the case, and Domain s are always assumed to be anchored in the root of the DNS tree; therefore, the two domains.
Examples prep. The following arguments are possible: IsError Abort the request and end up with a 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. Example ProxyBlock "news. Example for default behavior ProxyErrorOverride On. Example for custom status codes ProxyErrorOverride On In almost every case, there's no reason to change that value.
Example ProxyMaxForwards It is strongly suggested to review the concept of a Worker before proceeding any further with this section. The ProxyRequests directive should usually be set off when using ProxyPass. Ordering ProxyPass Directives in Locations Only one ProxyPass directive can be placed in a Location block, and the most specific location will take precedence.
Exclusions and the no-proxy environment variable Exclusions must come before the general ProxyPass directives. Note In addition to the nonce, the balancer-manager page should be protected via an ACL. Performance warning Keep this turned off unless you need it! Security Warning Take care when constructing the target URL of the rule, considering the security impact from allowing the client influence over the set of URLs to which your server will act as a proxy. Example ProxyReceiveBufferSize Warning Keep in mind that the same parameter key can have a different meaning depending whether it is applied to a balancer or a worker, as shown by the two examples above regarding timeout.
Note Full is synonymous with On. 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.
ProxyPass [ path ]! Minimum number of connection pool entries, unrelated to the actual number of connections. This only needs to be modified from the default for special circumstances where heap memory associated with the backend connections should be preallocated or retained.
Maximum number of connections that will be allowed to the backend server. The default for this limit is the number of threads per process in the active MPM. Retained connection pool entries above this limit are freed during certain operations if they have been unused for longer than the time to live, controlled by the ttl parameter.
If the connection pool entry has an associated connection, it will be closed. This only needs to be modified from the default for special circumstances where connection pool entries and any associated connections which have exceeded the time to live need to be freed or closed more aggressively. If set, this will be the maximum time to wait for a free connection in the connection pool, in milliseconds. Connect timeout in seconds. The number of seconds Apache httpd waits for the creation of a connection to the backend to complete.
By adding a postfix of ms, the timeout can be also set in milliseconds. This helps in various situations where a firewall between Apache httpd and the backend server regardless of protocol tends to silently drop connections or when backends themselves may be under round- robin DNS. When connection reuse is enabled each backend domain is resolved with a DNS query only once per child process and cached for all further connections until the child is recycled.
To disable connection reuse, set this property value to On. Determines whether the proxy module will auto-flush the output brigade after each "chunk" of data. The time to wait for additional input, in milliseconds, before flushing the output brigade if 'flushpackets' is 'auto'. Adjusts the size of the internal scratchpad IO buffer.
This must be at least or set to 0 for the system default of Adjust the size of the proxy response field buffer. The buffer size should be at least the size of the largest expected header size from a proxied response. Setting the value to 0 will use the system default of bytes.
Sets the load balancer cluster set that the worker is a member of. The load balancer will try all members of a lower numbered lbset before trying higher numbered ones. Ping property tells the webserver to "test" the connection to the backend before forwarding the request. In both cases, the parameter is the delay in seconds to wait for the reply. This feature has been added to avoid problems with hung and busy backends.
This will increase the network traffic during the normal operation which could be an issue, but it will lower the traffic in case some of the cluster nodes are down or busy. By adding a postfix of ms, the delay can be also set in milliseconds. This allows you to override the ProxyReceiveBufferSize for a specific worker. This must be at least or set to 0 for the system default. Redirection Route of the worker. This value is usually set dynamically to enable safe removal of the node from the cluster.
If set, all requests without session id will be redirected to the BalancerMember that has route parameter equal to this value. Connection pool worker retry timeout in seconds. If the connection pool worker to the backend server is in the error state, Apache httpd will not forward any requests to that server until the timeout expires. This enables to shut down the backend server for maintenance and bring it back online later. A value of 0 means always retry workers in an error state with no timeout.
Route of the worker when used inside load balancer. The route is a value appended to session id. Single letter value defining the initial status of this worker. D: Worker is disabled and will not accept any requests.
R: Worker is a hot spare. For each worker in a given lbset that is unusable draining, stopped, in error, etc. Hot spares can help ensure that a specific number of workers are always available for use by a balancer.
H: Worker is in hot-standby mode and will only be used if no other viable workers or spares are available in the balancer set. N: Worker is in drain mode and will only accept existing sticky sessions destined for itself and ignore all other requests. Connection timeout in seconds. Time to live for inactive connections and associated connection pool entries, in seconds. All rights reserved. Covered by US Patent. Come for the solution, stay for everything else.
Welcome to our community! I see something like this in my httpd. Can not I just put ProxyPass directive? Join our community to see this answer! Unlock 1 Answer and 5 Comments. Andrew Hancock - VMware vExpert.
ProxyPass will create a reverse proxy. A reverse proxy or gateway , appears to the client just like an ordinary web server. The client makes ordinary requests for content in the namespace of the reverse proxy. The reverse proxy then decides where to send those requests and returns the content as if it were itself the origin.
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