Virtualization results in efficiencies unachievable in the local physical realm by minimizing the number of actual copies of a physical resource that are installed and made available to users on a time shared basis. In all cases these are “virtual” solutions from a user perspective, meaning they exist in physical form in the network on servers but are allocated to, and shared among, a number of users on an assigned at access basis. These are various strategies for delivering user computing and application resources as online services rather than locally implemented instances. This article will focus on a specific area of virtualization affecting both individual and corporate users of computing systems and applications, referred to variously as hosted virtual desktops (HVD), web desktops, web OS and online or “cloud” computers. The proliferation of virtualization technologies, products and services has lead to an overwhelming array of options to both developers and IT administrators. Anyone familiar with the internal workings of computing devices and networks is already familiar with the most commonly used forms of virtualization – including virtual memory in PCs and servers, and virtual private networks used to deploy secure access to private network and computing resources over public infrastructure. There are lots of different forms and formats of virtualization affecting platforms, computers, infrastructure, applications and services. Generally speaking virtualization refers to the abstraction of computing resources (see Wikipedia for more on this topic). One of the hottest topics in computing and communications is virtualization, but what exactly does it mean and how does it impact users of computing and communications resources? The error message returned because the backend server failed to connect to the client.A summary of today's virtualization technologies and the distinguishing aspects of the different types of virtualization and cloud computing, followed by an examination of an interesting new online virtual personal computer service for smart phone - including iPhone - users called AlwaysOnPC. The error message returned because the API is not found based on the request path and the request method. The error message returned because an unknown environment is requested. The API group may not belong to the current instance. The error message returned because an invalid instance is requested. The error message returned because the domain name in the request is unknown. The error message returned because the Content-Type value is invalid. The error message returned because the request URL is too long. The error message returned because the request body is too large. The error message returned because a protocol that is not supported by the API configurations is used. The error message returned because the HTTP request URL is invalid. The error message returned because the HTTP request method is not supported. The error message returned because the HTTP request path is invalid. The error message returned because the HTTP request body is invalid. The error message returned because the HTTP request header is missing. The error message returned because the HTTP request header is invalid. API Gateway passes through the error information from the backend service. If the X-Ca-Error-Code header is empty, the HTTP status code is generated by a backend service. The X-Ca-Error-Message header indicates the detailed error message in the specific scenario. For more information, see the following table. An error code is six characters in length. If a client receives a response in which the X-Ca-Error-Code header is not empty, the HTTP status code is returned by API Gateway. The error codes described in this section apply to shared instances of the VPC type and dedicated instances of the VPC type. Error codes for API Gateway instances of the VPC type
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