Expedited sub-resource loading
Systems, methods, apparatus, and software for pre-fetching and/or pre-loading sub-resources used in rendering HTML files, web pages and the like are provided herein. Implementations include expedited sub-resource loading in which a cache node or other content delivery network component receives a first end user device request seeking a primary resource (e.g., an HTML file). Using information in the first request, the content delivery network pre-fetches one or more identified sub-resources (e.g., JavaScript code) required for rendering of the HTML file. Pre-fetched sub-resources are held by the cache node. During parsing of the HTML file by the end user device, a web browser or other application requires the sub-resource(s) and the end user device thus sends a second request to the cache node asking for the required sub-resource(s). The cache node sends the requested, pre-fetched sub-resource(s).
1. A method of operating a server that is configured to respond to end user requests, the method comprising:
receiving, at the server, a content request comprising a URL corresponding to an original HTML file, from an end user device of a group of multiple, different end user devices;
consulting a repository within the server to identify a first JavaScript code that is required for rendering the original HTML file into a web page and obtain identification and location information for the first JavaScript code, wherein the repository maintains a listing of JavaScript codes that have been historically requested for the URL by a plurality of the multiple different end user devices;
identifying a required sub-resource by scanning the original HTML file to identify a reference to the required sub-resource;
obtaining the first JavaScript code and the required sub-resource; and
sending the original HTML file, the first JavaScript code and the required sub- resource to the end user device.
2. The method of claim 1 further comprising:
receiving a request for the identified required sub-resource from the end user device after sending the identified reference to the required sub-resource to the end user device.
3. The method of claim 1 , wherein sending the original HTML file, the first JavaScript code and the required sub-resource to the end user device occurs without receiving a request from the end user device for at least one of the first JavaScript code and the required sub-resource.
4. The method of claim 1 , wherein the first JavaScript code is located at an origin server.
5. The method of claim 1 , wherein the required sub-resource is located at an origin server.
6. The method of claim 1 , wherein the required sub-resource is an image file.
7. The method of claim 1 further comprising, prior to receiving the content request,
caching the web page in the server.
8. A computer apparatus, comprising:
a processor; and
a memory;
wherein the computer apparatus is configured to operate a server in a network, the computer apparatus further comprising processing instructions that direct the server, when executed by the server, to:
receive a content request from an end user device of a group of multiple, different end user devices, comprising a URL corresponding to an original HTML file;
consult a repository within the server to identify a first JavaScript code required for rendering the original HTML file into a web page and obtain identification and location information for the first JavaScript code, wherein the repository maintains a listing of JavaScript codes that have been historically requested for the URL corresponding to the web page by a plurality of the group of multiple, different end user devices;
identify a required sub-resource by scanning the original HTML file to identify a reference to the required sub-resource;
obtain the first JavaScript code and the required sub-resource; and
send the original HTML file, the first JavaScript code and the required sub- resource to the end user device.
9. The computer apparatus of claim 8 , wherein the processing instructions further direct the server to:
receive a request for the identified required sub-resource from the end user device after sending the identified reference to the required sub-resource to the end user device.
10. The computer apparatus of claim 8 , wherein sending the original HTML file, the first JavaScript code and the required sub-resource to the end user device occurs without receiving a request from the end user device for at least one of the first JavaScript code and the required sub-resource.
11. The computer apparatus of claim 8 , wherein the first JavaScript code is located at an origin server.
12. The computer apparatus of claim 8 , wherein the required sub-resource is located at an origin server.
13. The computer apparatus of claim 8 , wherein the required sub-resource is an image file.
14. The computer apparatus of claim 8 wherein the processing instructions further direct the server to, prior to receiving the content request, cache the web page in the server.
15. A server that responds to requests from multiple, different end user devices, the server comprising:
a storage system configured to store web page content comprising an original HTML file corresponding to a web page, wherein the original HTML file comprises an HTML file body including a reference to a first JavaScript code that is required for rendering the original HTML file into the web page;
a repository that maintains a listing of JavaScript codes that have been historically requested for a URL corresponding to the web page by a plurality of the multiple, different end user devices;
responsive to a content request from an end user device for the web page, a network interface and processing circuitry configured to:
receive the content request from the end user device;
identify the first JavaScript code that is required for rendering the original HTML file into the web page by consulting the repository;
identify a required sub-resource by scanning the original HTML file to identify a reference to the required sub-resource;
obtain the first JavaScript code and the required sub-resource;
send the original HTML file, the first JavaScript code and the required sub-resource to the end user.
16. The server of claim 15 , wherein the network interface and processing circuitry are further configured to:
receive a request for the identified required sub-resource from the end user device after sending the identified reference to the required sub-resource to the end user device.
17. The server of claim 15 , wherein sending the original HTML file, the first JavaScript code and the required sub-resource to the end user device occurs without receiving a request from the end user device for at least one of the first JavaScript code and the required sub-resource.
18. The server of claim 15 , wherein the first JavaScript code is located at an origin server.
19. The server of claim 15 , wherein the required sub-resource is an image file.
20. The server of claim 15 , wherein the network interface and processing circuitry are further configured to, prior to receiving the content request, store the web page in the server.