Add the option to respond in XML format

[alvarocastro]

I use this api in Google Sheets to get the latest dollar blue price in a cell to use in other fomulaes.

Currently, sheets doesn't have a way to import and read from JSON format directly, I have to import the raw JSON and use a RegEx to extract the value:

=TEXT(REGEXEXTRACT(IMPORTDATA("https://api.bluelytics.com.ar/v2/latest","|"),"blue.+?value_buy.+?([\d\.]+)"), "0.00")

It works, but is a bit messy.

Sheets has a function to import and read XML, and the formula would be cleaner and less error prone:

=TEXT(IMPORTXML("https://api.bluelytics.com.ar/v2/latest.xml", "result/blue/buy"), "0.00")

Assuming the response is:

<result>
  <official>
    <valueavg>XXXX</valueavg>
    <valuesell>XXXX</valuesell>
    <valuebuy>XXXX</valuebuy>
  </official>
  <blue>
    <valueavg>XXXX</valueavg>
    <valuesell>XXXX</valuesell>
    <valuebuy>XXXX</valuebuy>
  </blue>
  ...
  <lastupdate>2024-12-11T12:16:12.015118-03:00</lastupdate>
</result>

Format parameter could be as an "extension": /v2/latest.xml or a query param ?format=xml

I would submit a PR myself buy don't know golang.

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This API is great and very useful, thanks for the effort!