How to get a previous version/revision of a post through the API

Development
5

Of course @vinothkannans, thanks again, I should have had a closer look.

For those landing here, notice that Discourse doesn’t really get you revision number n. Instead, it returns html formatted blocks, ready to be displayed in the various tabs of the Discourse “history” window. This is how it looks:

{  
   "created_at":"2017-03-01T17:41:38.441Z",
   "post_id":15,
   "first_revision":2,
   "previous_revision":2,
   "current_revision":3,
   "next_revision":null,
   "last_revision":3,
   "current_version":3,
   "version_count":3,
   [...]
   "body_changes":{  
      "inline":"<div class=\"inline-diff\"><p><ul>\n<li><p>Why should people use this category? What is it for?</p></li>\n<li><p>How exactly is this different than the other categories we already have?</p></li>\n<li><p>What should topics in this category generally contain?</p></li>\n<li><p>Do we need this category? Can we merge with another category, or subcategory?</p></li>\n</ul><p>aaaaaaa<br class=\"diff-ins\"><ins>bbbbbbb</ins></p></div>",
      "side_by_side":"<div class=\"span8\"><p><ul>\n<li><p>Why should people use this category? What is it for?</p></li>\n<li><p>How exactly is this different than the other categories we already have?</p></li>\n<li><p>What should topics in this category generally contain?</p></li>\n<li><p>Do we need this category? Can we merge with another category, or subcategory?</p></li>\n</ul><p>aaaaaaa</p></div><div class=\"span8 offset1\"><p><ul>\n<li><p>Why should people use this category? What is it for?</p></li>\n<li><p>How exactly is this different than the other categories we already have?</p></li>\n<li><p>What should topics in this category generally contain?</p></li>\n<li><p>Do we need this category? Can we merge with another category, or subcategory?</p></li>\n</ul><p>aaaaaaa<br class=\"diff-ins\"><ins>bbbbbbb</ins></p></div>",
      "side_by_side_markdown":"<table class=\"markdown\"><tr><td>- Why should people use this category? What is it for?\n\n- How exactly is this different than the other categories we already have?\n\n- What should topics in this category generally contain?\n\n- Do we need this category? Can we merge with another category, or subcategory?\n\n</td><td>- Why should people use this category? What is it for?\n\n- How exactly is this different than the other categories we already have?\n\n- What should topics in this category generally contain?\n\n- Do we need this category? Can we merge with another category, or subcategory?\n\n</td></tr><tr><td class=\"diff-del\">aaaaaaa</td><td class=\"diff-ins\">aaaaaaa<ins>\nbbbbbbb</ins></td></tr></table>"
   },
   "title_changes":{  
      "inline":"<div class=\"inline-diff\"><div>About the subcategory category</div></div>",
      "side_by_side":"<div class=\"span8\"><div>About the subcategory category</div></div><div class=\"span8 offset1\"><div>About the subcategory category</div></div>"
   },
   "user_changes":null,
   "wiki":false,
   "can_edit":true
}