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The Vary functionality is based on a secondary key that needs to be calculated for every request to which a server answers with a Vary header. The Vary header, which can only be found in server responses, determines which headers of the request need to be taken into account in the secondary key. Since we do not want to have to store all the headers of the request until we have the response, we will pre-calculate as many sub-hashes as there are headers that we want to manage in a Vary context. We will only focus on a subset of headers which are likely to be mentioned in a Vary response (accept-encoding and referer for now). Every managed header will have its own normalization function which is in charge of transforming the header value into a core representation, more robust to insignificant changes that could exist between multiple clients. For instance, two accept-encoding values mentioning the same encodings but in different orders should give the same hash. This patch adds a function that parses a Vary header value and checks if all the values belong to our supported subset. It also adds the normalization functions for our two headers, as well as utility functions that can prebuild a secondary key for a given request and transform it into an actual secondary key after the vary signature is determined from the response. |
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The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)