Systems and methods for script injection

A non-transitory computer readable storage medium having instructions thereon that, when executed, measure parameters associated with loading a web page, the instructions comprising:

• instructions to intercept, by a network appliance, a request from a computing device for a web page in a first network domain;
• instructions to transmit, by the network appliance, the request for the web page to a web server;
• instructions to intercept, by the network appliance, a response transmitted from the web server in the first network domain, the transmitted response including at least a portion of the requested web page and not including a first script having instructions that when executed by the computing device registers to be notified of an occurrence of a web page event;
• instructions to inspect, by the network appliance, contents of the response transmitted from the web server;
• instructions to inject into the response, by the network appliance and responsive to inspection of the contents of the response transmitted from the web server and a determination from the inspection that an injection is required based on the contents of the response, the first script thereby creating a modified response including the first script, the first script having instructions that when executed by the computing device:
• i) registers to be notified of the occurrence of the web page event, and
• ii) reports the occurrence of the web page event, responsive to notification of the occurrence, to a performance monitoring server in a second network domain, different than the first network domain, such that the client communicates directly with the performance monitoring server in the second network domain without interference by the network appliance;
• instructions to accelerate, by the network appliance, the modified response to be received by the computing device;
• and
• instructions to transmit, from the network appliance, the modified response to the computing device that requested the web page.

A system for measuring parameters associated with loading a web page, the system comprising:

• means for intercepting, by a network appliance, a request from a computing device for a web page in a first network domain;
• means for transmitting, by the network appliance, the request for the web page to a web server;
• means for intercepting, by the network appliance, a response transmitted from the web server in the first network domain, the transmitted response including at least a portion of the requested web page and not including a first script having instructions that when executed by the computing device registers to be notified of an occurrence of a web page event;
• means for injecting into the response, by the network appliance responsive to an inspection of the response transmitted from the web server and a determination from the inspection that an injection is required based on contents of the response, the first script thereby creating a modified response including the first script, the first script having instructions that when executed by the computing device:
• i) registers to be notified of the occurrence of the web page event;
• and
• ii) reports the occurrence of the web page event, responsive to notification of the occurrence, to a performance monitoring server in a second network domain, different than the first network domain, such that the client communicates directly with the performance monitoring server in the second network domain without interference by the network appliance;
• means for accelerating, by the network appliance, the modified response to be received by the computing device;
• and
• means for transmitting, from the network appliance, the accelerated and modified response to the computing device that requested the web page.