The RSOE runs on the same machine as the backend server. Its purpose is to:
When the RSOE starts, it makes an HTTP request to retrieve the list of relay servers running in the farm. This is done using the server URL that maps to the web server extension component of the relay server. The server URL can map directly to a relay server or it can map to a load balancer. If the server URL maps to a load balancer, the load balancer forwards the request to one of the relay servers running in the farm. The relay server that receives the request from the RSOE returns the connection information for all relay servers in the farm. The RSOE then creates two outbound connections, called channels, to each relay server returned. One channel, called the up channel, is created using an HTTP request with an essentially infinite response. The response is a continuous stream of client requests from the relay server to the RSOE. The second channel, called the down channel, is created using an HTTP request with an essentially infinite content length. The request is formed by a continuous stream of server responses to client requests.
When the RSOE receives a client request on the up channel from one of the relay servers it has connected to, it forwards it to the backend server that the RSOE is servicing. Once a response is received from the backend server, it gets forwarded to the relay server from which it received the corresponding request using the down channel.
Options The following options can be used to the RSOE. They are all optional.
The name of the farm that the backend server belongs to.
The name assigned to the backend server.
The host and port used to connect to the backend server. The default is “host=127.0.0.1;port=80”.
The relay server connection string. The format of the relay server connection string is a semicolon separated list of name-value pairs. The name-value pairs consist of the following:
For https=1, the following options can also be specified:
The security token to be passed to the relay server.
Set the verbosity level to use for logging. The level can be 0, 1, 2, 3, 4, or 5:
The relay server connection retry interval. The default is 5 seconds.
Stop the RSOE.
The RSOE may also be set up and maintained as a Windows service using the SQL Anywhere Service Utility. See Service utility (dbsvc) for Windows.
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