Content-Type Codecs

Codec transformations are supported in Request, Endpoint and Connector units. 
Supported Codecs
Xapix currently supports codecs with the corresponding Content-Type regexps (regular expressions).
Content-Type regexp
codec
text/plain
text
application/(.*+)?json
json
application/edn
edn
text/csv
csv
(application|text)/(.*+)?xml
xml
text/html
html
application/x-www-form-urlencoded
x-www-form-urlencoded
If one of the regexps matches the Content-Type then the corresponding codec will be applied. 
Each unit calls either the encode or decode function of a codec, depending on if it is an input or output of unit. See the following sections for details.
Request unit 
The following shows a Request example with Content-Type: text/xml.
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Content-Type: text/xml
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​
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<root level="INFO">
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  <appender-ref ref="CONSOLE"/>
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</root>
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The Request unit applies the decode function of the xml codec which results in the following as it appears in the next pipeline unit.
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{
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  "tag": "root",
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  "attrs": {
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    "level": "debug"
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  },
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  "children": [
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    "\n  ",
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    {
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      "tag": "appender-ref",
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      "attrs": {
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        "ref": "STDOUT"
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      }
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    },
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    "\n"
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  ]
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}
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Endpoint unit
Endpoint unit applies the decode function of codec to body. The codec is determined by the Content-Type header. 
For example, if the endpoint parameters has a Content-Type: text/xml header, then the xml decoder will be applied to the body parameter.
Connector unit
Request
A connector unit applies the encode function of a codec to body. 
The codec is determined by Content-Type header. For example, if a connector parameter has Content-Type: text/xml header then the xml encoder will be applied to body parameter.
Response
A connector unit applies the decode function of the codec to body. Codec is determined by Content-Type header. For example, if the Connector parameter has Content-Type: text/xml header then xml decoder will be applied to body parameter.

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