129 lines
5.6 KiB
Plaintext
129 lines
5.6 KiB
Plaintext
51Degrees Device Detection
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You can also include 51Degrees for inbuilt device detection enabling attributes
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such as screen size (physical & pixels), supported input methods, release date,
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hardware vendor and model, browser information, and device price among many
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others. Such information can be used to improve the user experience of a web
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site by tailoring the page content, layout and business processes to the
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precise characteristics of the device. Such customisations improve profit by
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making it easier for customers to get to the information or services they
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need. Attributes of the device making a web request can be added to HTTP
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headers as configurable parameters.
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In order to enable 51Degrees download the 51Degrees source code from the
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official github repository :
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git clone https://github.com/51Degrees/Device-Detection
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then run 'make' with USE_51DEGREES and 51DEGREES_SRC set. Both 51DEGREES_INC
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and 51DEGREES_LIB may additionally be used to force specific different paths
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for .o and .h, but will default to 51DEGREES_SRC. Make sure to replace
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'51D_REPO_PATH' with the path to the 51Degrees repository.
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51Degrees provide 2 different detection algorithms:
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1. Pattern - balances main memory usage and CPU.
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2. Trie - a very high performance detection solution which uses more main
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memory than Pattern.
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To make with 51Degrees Pattern algorithm use the following command line.
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$ make TARGET=<target> USE_51DEGREES=1 51DEGREES_SRC='51D_REPO_PATH'/src/pattern
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To use the 51Degrees Trie algorithm use the following command line.
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$ make TARGET=<target> USE_51DEGREES=1 51DEGREES_SRC='51D_REPO_PATH'/src/trie
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A data file containing information about devices, browsers, operating systems
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and their associated signatures is then needed. 51Degrees provide a free
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database with Github repo for this purpose. These free data files are located
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in '51D_REPO_PATH'/data with the extensions .dat for Pattern data and .trie for
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Trie data.
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The configuration file needs to set the following parameters:
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global
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51degrees-data-file path to the Pattern or Trie data file
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51degrees-property-name-list list of 51Degrees properties to detect
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51degrees-property-separator separator to use between values
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51degrees-cache-size LRU-based cache size (disabled by default)
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The following is an example of the settings for Pattern.
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global
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51degrees-data-file '51D_REPO_PATH'/data/51Degrees-LiteV3.2.dat
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51degrees-property-name-list IsTablet DeviceType IsMobile
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51degrees-property-separator ,
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51degrees-cache-size 10000
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HAProxy needs a way to pass device information to the backend servers. This is
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done by using the 51d converter or fetch method, which intercepts the HTTP
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headers and creates some new headers. This is controlled in the frontend
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http-in section.
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The following is an example which adds two new HTTP headers prefixed X-51D-
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frontend http-in
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bind *:8081
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default_backend servers
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http-request set-header X-51D-DeviceTypeMobileTablet %[51d.all(DeviceType,IsMobile,IsTablet)]
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http-request set-header X-51D-Tablet %[51d.all(IsTablet)]
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Here, two headers are created with 51Degrees data, X-51D-DeviceTypeMobileTablet
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and X-51D-Tablet. Any number of headers can be created this way and can be
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named anything. 51d.all( ) invokes the 51degrees fetch. It can be passed up to
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five property names of values to return. Values will be returned in the same
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order, seperated by the 51-degrees-property-separator configured earlier. If a
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property name can't be found the value 'NoData' is returned instead.
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In addition to the device properties three additional properties related to the
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validity of the result can be returned when used with the Pattern method. The
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following example shows how Method, Difference and Rank could be included as one
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new HTTP header X-51D-Stats.
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frontend http-in
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...
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http-request set-header X-51D-Stats %[51d.all(Method,Difference,Rank)]
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These values indicate how confident 51Degrees is in the result that that was
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returned. More information is available on the 51Degrees web site at:
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https://51degrees.com/support/documentation/pattern
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The above 51d.all fetch method uses all available HTTP headers for detection. A
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modest performance improvement can be obtained by only passing one HTTP header
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to the detection method with the 51d.single converter. The following example
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uses the User-Agent HTTP header only for detection.
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frontend http-in
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...
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http-request set-header X-51D-DeviceTypeMobileTablet %[req.fhdr(User-Agent),51d.single(DeviceType,IsMobile,IsTablet)]
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Any HTTP header could be used inplace of User-Agent by changing the parameter
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provided to req.fhdr.
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When compiled to use the Trie detection method the trie format data file needs
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to be provided. Changing the extension of the data file from dat to trie will
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use the correct data.
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global
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51degrees-data-file '51D_REPO_PATH'/data/51Degrees-LiteV3.2.trie
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When used with Trie the Method, Difference and Rank properties are not
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available.
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The free Lite data file contains information about screen size in pixels and
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whether the device is a mobile. A full list of available properties is located
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on the 51Degrees web site at:
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https://51degrees.com/resources/property-dictionary
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Some properties are only available in the paid for Premium and Enterprise
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versions of 51Degrees. These data sets not only contain more properties but
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are updated weekly and daily and contain signatures for 100,000s of different
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device combinations. For more information see the data options comparison web
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page:
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https://51degrees.com/compare-data-options
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