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Where Apache is able to dynamically load and enable modules at runtime, Nginx can only load modules that have been precompiled into the executable.Adversaries may attempt to get a listing of network connections to or from the compromised system they are currently accessing or from remote systems by querying for information over the network.Īn adversary who gains access to a system that is part of a cloud-based environment may map out Virtual Private Clouds or Virtual Networks in order to determine what systems and services are connected. Therefore Nginx is often used as a front-end/proxy server in combination with other application servers, possibly Apache.īoth web servers are extensible with modules (security, compression, proxy, …).
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Nginx’ event-driven approach requires less resources, making it faster, especially for static content.įor dynamic content however, Nginx needs to proxy requests to an external processor for execution as it has no programming language support. Though they share several features, their architectures differ significantly.Īpache relies on a process-based model, either with a single or multiple threads per process that handle a connection, whereas Nginx operates event-driven with multiple single-threaded processes that all handle connections asynchronously. To launch this with netcat compiled with DGAPING_SECURITY_HOLE option:Īpache and Nginx are the two most used open-source webservers on the internet. This only covers reprentation of a web page, or an error page in case of a missing file. Output to file descriptor 2 ( >&2) is written to the server terminal. Stdout output acts as the response to the client. The server is currently unable to fulfill the request. The server is acting as a gateway/proxy and received an invalid response from a server it contacted to fulfill the request. The server encountered an unexpected error. The request to the target resource is not allowed for reasons unrelated to authentication. The request to the target resource is not allowed due to missing or incorrect authentication credentials.
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The server cannot process the request as it is perceived as invalid. As the move is temporarily, future references should still use the same location. The target resources been temporarily moved. The server should mention the new location in the Location header in the response. The target has moved to a new location and future references should use a new location. Perform a message loop-back test along the path to the target resource.Īfter the empty line, an optional message body in the request contains the payload (data) associated with the request. Remove all current representations of the target resource.Įstablish a tunnel to the server identified by the target resource.ĭescribe the communication options for the target resource. Replace all current representations of the target resource with the requested payload. Perform resource-specific processing on the request payload. Same as GET, but only transfer the status line and header section. Tranfers a current representation of the target resource. Some implementations might interpret a request without Host header as invalid, and respond with the 400 Bad Request message.Īn empty line indicates the end of the request line and header section. The request line is followed by headers containing client information and other metadata.Īs per protocol specification, the client must include the Host header in the HTTP request.Ī single server may serve several (virtual) hosts, so the Host header signals the server to which of the possible hosts to route the request.