Parameter

Meaning

Unit

Default value

icm/server_port_<xx>

Starting point for requests, protocols, timeouts, and so on.

You have to define this parameter.

Character string

-

wdisp/auto_refresh

The period of time after which the route information tables of the SAP Web Dispatcher (server tables, group tables and URL mapping tables) are periodically updated.

The parameter also defines the frequency of ping of requests to the application servers (see below).

Seconds

25

wdisp/info_timeout

Timeout for retrieving configuration data in the application servers. If the Web Dispatcher receives no response within this time, it asks the next server.

The parameter also defines the timeout for the ping of requests to the application servers (see below).

Seconds

180

wdisp/max_servers

This parameter determines the maximum number of entries in the SAP Web Dispatcher’s server table.

Whole number (between 64 and 4096)

100

wdisp/max_server_name_len

This parameter specifies the maximum length of an entry in the SAP Web Dispatcher’s server table, that is, the maximum length of an instance name (profile parameter rdisp/myname of the individual servers).

Whole number (between 32 and 128)

64

wdisp/max_server_groups

This parameter determines the maximum number of entries in the SAP Web Dispatcher’s group table.

Whole number (between 32 and 4096)

128

wdisp/max_server_group_name_len

This parameter determines the maximum length of an entry in the SAP Web Dispatcher’s group table.

You maintain logon groups in transaction SMLG.

Whole number (between 20 and 64)

20

wdisp/max_url_map_entries

This parameter determines the maximum number of entries in the SAP Web Dispatcher’s URL mapping table.

Whole number (between 100 and 10000)

300

wdisp/max_url_map_path_len

This parameter determines the maximum path length in the SAP Web Dispatcher’s URL mapping table.

Whole number (between 100 and 2048)

256

wdisp/server_info_location

Specifies from where the SAP Web Dispatcher obtains information about the application servers, to which it can distribute the Web requests.

The SAP Web Dispatcher gets its information from the message server. The parameter indicates the (relative) URL where in the message server this information is.

You can also find this information in a file. In this case you can use this parameter to specify the file path by setting the parameter to file://<path>.

Character string

/msgserver/text/logon

wdisp/group_info_location

Specifies from where the SAP Web Dispatcher obtains information about the server groups, to which it can distribute the Web requests.

The details are indicated in a URL (absolute or relative).

Usually the SAP Web Dispatcher gets its group information from an application server (transaction SMLG). In this case you can specify the ICF service, where the groups are defined.

If there is no application server with ICF (ABAP) available, you can store this information in a file. In this case you can use this parameter to specify the file path by setting the parameter to file://<path>.

Character string

/sap/public/icf_info/icr_groups

wdisp/url_map_location

URL under which the SAP Web Dispatcher finds the URL mapping info.

This is usually a path in the http service hierarchy of the application server (transaction SICF).

If there is no application server with ICF (ABAP) available, you can store this information in a file. In this case you can use this parameter to specify the file path by setting the parameter to file://<path>.

URL path name

/sap/public/icf_info/icr_urlprefix

wdisp/system_<xx>

Used to configure the Web Dispatcher for multiple back-end systems.

For more information, see wdisp/system_<xx>

Character string

-

wdisp/server_info_protocol

wdisp/group_info_protocol

wdisp/url_map_protocol

wdisp/ping_protocol

Protocol that the SAP Web Dispatcher should use for communicating with the message server and the application servers for exchanging metadata (server list, logon groups, URL mapping) or for performing the ping request on the application server.

You can secure the conenction using HTTPS.

For more information, see Metadata Exchange Using SSL.

Protocol name, possible values: http or https

http

wdisp/enable_j2ee_groups

Allow logon groups for AS Java (refer to Configuring Logon Groups on AS Java).

Truth value

FALSE

wdisp/J2EE/group_info_location

URL under which the Web Dispatcher receives the information about the logon groups in AS Java.

URL path name

/J2EE/icr_groups

wdisp/J2EE/url_map_location

URL under which the SAP Web Dispatcher finds the URL mapping info for AS Java.

URL path name

/J2EE/icr_urlprefix

wdisp/ping_abap_url

URL that the SAP Web Dispatcher uses for ping requests - for ABAP Servers, Java Servers and external systems.

The ping requests that can be configured with these parameters are used for the health check of the instances.

The specified request is sent periodically to each application server (that is, to each instance). If the specified request for a server does not respond positively within a defined time (HTTP status code 200 (OK)), this server is removed from the Web Dispatcher load balancing. You can configure the frequency with which a request is sent to each instance in parameter wdisp/auto_refresh (see above). The time allowed for receiving the response can be configured in parameter wdisp/info_timeout.

For more information, see SAP Web Dispatcher for Multiple Systems

URL path name

/sap/public/icman/ping

wdisp/ping_java_url

-

wdisp/ping_extsrv_url

-

wdisp/permission_table

Absolute or relative path for URI permission table. Further profile parameters for configuring the URI permission table are described in section SAP Web Dispatcher as URL Filter.

Character string (file path)

wdisp/shm_attach_mode

This parameter determines what should happen to the shared memories of the SAP Web Dispatcher. The possible values and their meaning are the values of the start option -shm_attach_mode of the Web Dispatcher. They are described in section Starting the SAP Web Dispatcher.

Whole number (between 1 and 7)

6

wdisp/HTTP/use_pool_for_new_conn

Activates the connection pooling for new browser connections too If the parameter has the default value FALSE, the connection pooling is used only for keep-alive connections to the browser.

Truth value (TRUE,1, FALSE,0)

FALSE

wdisp/HTTP/max_pooled_con

This parameter determines the maximum number of HTTP connections in the connection pool from the SAP Web Dispatcher to an application server.

You do not normally need to change the default setting.

Number of connections

32768

wdisp/HTTP/min_pooled_con

Minimum number of HTTP connections that are kept in the SAP Web Dispatcher’s connection pool for each application server. This number of connections is kept before the first HTTP request is received.

Number of connections

2

wdisp/HTTPS/dest_logon_group

See SSL Parameters

wdisp/HTTPS/sticky_mask

wdisp/HTTPS/max_client_ip_entries

wdisp/HTTPS/context_timeout

wdisp/HTTPS/max_pooled_con

wdisp/HTTPS/min_pooled_con

wdisp/ssl_encrypt

wdisp/ssl_auth

wdisp/ssl_cred

wdisp/ssl_certhost

wdisp/load_balancing_strategy

Load balancing strategy of the SAP Web Dispatcher, see Server Selection and Load Balancing Using the SAP Web Dispatcher

Load balancing strategy

Possible values:

weighted_round_robin

simple_weighted_round_robin

adaptive

weighted_round_robin

wdisp/max_permitted_uri_len

wdisp/permitted_uri_char_range

wdisp/max_permission_table_size

wdisp/max_permission_table_entry_size

Parameters to configure the SAP Web Dispatcher as a URL Filter

wdisp/add_xforwardedfor_header

The parameter determines whether the SAP Web Dispatcher includes the IP address of the client in the header field x-forwarded-for. If it does, the application on the application server can read the route that the request has taken. If the parameter has the value false, the Web Dispatcher leaves the header field unchanged.

Truth variable (true or false)

false

wdisp/add_client_protocol_header

This parameter determines whether the protocol between the browser and the Web Dispatcher (HTTP or HTTPS) is notified to the application server.

This information is sent in the header field clientprotocol.

If there is a change in protocol in the Web Dispatcher, the application server requires this information, to generate absolute URLs (it can get the Web dispatcher host and port names from the header field Host).

Truth variable (true or false)

false

wdisp/handle_webdisp_ap_header

With this parameter the Web Dispatcher notifies the application server of its ports (access points) for the different protocols in an HTTP header. In the application server the protocol can be switched without any manual configuration (for example, from HTTP to HTTPS), or a redirect can be programmed.

The header field set by the Web Dispatcher has the syntax:

x-sap-webdisp-ap: http=80,https=443

x-sap-webdisp-ap: http=80

Integer between 0 and 3; the values mean the following:

0: No action (old behavior)

1: Header field with it own access information (if this field exists, it is set)

2: Set header field if not already set.

3: Delete header field if it exists.

0

wdisp/enable_sap_hostid

If the value of this parameter is true, a server destination can be specified explicitly in the request URI using the form field sap-hostid, to directly override the load balancing.

This is needed, for example, for debugging server nodes or for test purposes.

webdisp.wdf.sap.corp:4711/sap/public/icman/ping?sap-hostid=binmain_BIN_53

Truth variable (true or false)

false

wdisp/redispatch_foreign_sessions

If the value of this parameter is true, the Web Dispatcher tries to find an alternative server using stateless load balancing for failed stateful requests (incorrect session cookie or the target server cannot be accessed).

This has the following advantages:

Truth variable (true or false)

true

wdisp/HTTP/esid_support

wdisp/HTTP/jsessionid_tab_support

wdisp/HTTP/max_session_tab_logon_groups

wdisp/HTTP/max_session_tab_entries

wdisp/HTTP/context_timeout

The parameters below are used to configure the session dispatching. They are described in Parameter Settings for Session Dispatching.