Gateway system and control method

A gateway system to distribute requests from a plurality of terminals to a plurality of first server devices, comprising:

• a plurality of second server devices;
• and
• a name resolution device,
• wherein a plurality of specified IP addresses are registered in each of the second server devices,
• wherein hash functions are distributed for generating a hash value from a character string,
• wherein each of the second server devices:
• extracts an access destination URL from a received second request, after receiving the second request from one of the terminals for acquiring contents from one of the first server devices,
• decides whether or not a hash value is contained in the extracted URL,
• deletes the hash value from the extracted URL if the extracted URL contains a hash value,
• transfers the second request setting the URL whose hash value was deleted, as an access destination to the one first server device,
• generates a hash value from a character string of the extracted URL by utilizing the distributed hash functions if the extracted URL contains no hash value,
• adds the generated hash value to a host name of the extracted URL, and
• instructs the one terminal to resend the second request setting the URL containing the hash value as the access destination, and
• wherein the name resolution device extracts the access destination URL from the first request, when the one terminal sends a first request for resolving a name of the URL containing the hash value to the name resolution device,
• extracts the hash value from the extracted URL,
• combines a specified prefix with the extracted hash value to generate an IP address, and
• sends the generated IP address to the one terminal as a reply to the first request, and
• wherein the second request that was sent by the one terminal for setting the URL containing the hash value as the access destination, is sent to one of the second server devices for registering the IP address sent as a reply to the first request.

A control method implemented on a gateway system that distributes requests from a plurality of terminals to a plurality of first server devices;

• the gateway system including a plurality of second server devices, a management device, and a name resolution device,
• an address generating function, which is a hash function that generates a hash value from a character string of an extracted URL host name, to generate an IP address from the character string, which is distributed into the name resolution device, and
• a plurality of specified IP addresses being registered into one of the second server devices,
• the control method comprising:
• the name resolution device extracting an access destination URL from a received first request when the first request for resolving the name of an access destination URL is received from one of the terminals;
• the name resolution device generating the IP address from the character string of the extracted URL host name by using the hash function;
• the name resolution device sending the generated IP address to the one terminal as a reply to the first request;
• the one second server device transferring a second request that was sent to one of the first server devices based on the access destination URL, when the one terminal sends the second request setting the access destination URL of the one first server device to the one second server device that registered the IP address that was sent;
• the management device distributing an address resolution function to the name resolution device;
• the management device dividing up all IP addresses generated by the name resolution device into a plurality of IP addresses;
• the management device distributing all the plurality of IP addresses to each of the second server devices;
• and
• the second server devices registering the plurality of distributed IP addresses.