Method for transferring and displaying data pages on a data network
First Claim
1. A method for reducing the delay between the time a data page is requested and the time the data page is displayed comprising the steps of:
- receiving a request for retrieval of a data page wherein the request further comprises an indication that a response to the request can contain difference data;
transmitting a first version of the data page in response to the request;
determining whether there is a difference between a second version of the data page and the first version of the data page; and
if there is a difference between the second version of the data page and the first version of the data page, transmitting in response to said request difference data computed from the difference between the first version of the data page and the second version of the data page.
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Accused Products
Abstract
The apparent speed of a connection between a browser at a user station and a proxy or gateway on a network such as the Internet is increased by providing a local proxy at the user station which interacts with a remote proxy. While the remote proxy is retrieving a newly requested World Wide Web page, for example, from the appropriate content provider, it may also be sending to the local proxy a stale cached version of that page. When the new version of the page is finally retrieved, the remote proxy determines the differences between the new version and the stale version, and, assuming the differences do not exceed the new page in size, sends the differences to the local proxy which then reconstructs the new page from the differences and the stale version. The local proxy delivers the new page to the browser, which need not even be aware that a local proxy exists; it is aware only that it received the page it requested. Because computational speed and power are frequently higher and cheaper than transmission speed, the apparent speed of the connection between the user station and the network has been increased at modest cost.
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Citations
19 Claims
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1. A method for reducing the delay between the time a data page is requested and the time the data page is displayed comprising the steps of:
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receiving a request for retrieval of a data page wherein the request further comprises an indication that a response to the request can contain difference data;
transmitting a first version of the data page in response to the request;
determining whether there is a difference between a second version of the data page and the first version of the data page; and
if there is a difference between the second version of the data page and the first version of the data page, transmitting in response to said request difference data computed from the difference between the first version of the data page and the second version of the data page. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for reducing the delay between the time a data page is requested and the time the data page is displayed comprising the steps of:
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receiving a request for retrieval of a data page wherein the request further comprises identification of a first version of the data page and an indication that a response to the request can contain difference data;
determining a difference between a second version of the data page and the first version of the data page;
if there is no difference between the second version of the data page and the first version of the data page, transmitting a response to the request indicating that the first version of the data page has not been modified; and
if there is a difference between the second version of the data page and the first version of the data page, transmitting a response containing difference data computed from the difference between the first version of the data page and the second version of the data page. - View Dependent Claims (16, 17, 18, 19)
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Specification