Update for 28-04-22 15:00

tech/Crow.wiki

@@ -73,6 +73,8 @@ can only READ from a `rvalue`. To write to one, convert to `wvalue`. This is
 done via `crow::json::wvalue wval(rval);`, where `rval` is the `rvalue` you
 want to convert.
 
+Assign values to a `crow::json` value via the index operator.
+
 You can return a `wvalue` in a route handler, and the type is automatically
 casted and the header Content-Type header is automatically set to
 `application/json`.
@@ -84,4 +86,37 @@ See [[Mustache]]
 An HTML page template with mustache tags is loaded into a
 `crow::mustache::template_t`. The file needs to be in a templates directory.
 These templates are read at runtime, and therefore need to be available to the
-binary. 
+binary. A global templates directory can be set via
+`crow::mustache::set_global_base("new_template_dir")`.
+
+== Query Strings ==
+
+A query string is part of a URL that has a `?` char at the end, with the same
+format as a POST request. In a handler you will have access to a
+`crow::request::url_params`. It supports
+* `get(name)`
+  * get `name` and return value as a `char*`
+  * if not found return `nullptr`
+* `get_list(name)`
+  * return a `std::vector<std::string>` of values if key in query string is of
+    format `key[]=val1&key[]=val2`
+* `get_dict(name)`
+  * return a `std::unordered_map<std::string, std::string>` of values for dict
+    style query string
+
+All of the above `get_*` operation has a `pop_*` counterpart that modifies the
+object. Note that the provided `crow::request::url_params` object is `const` by
+default, and therefore you will not be able to call `pop_*` on it unless a copy
+is made.
+
+== Compression ==
+
+Compression is disabled by default. To enable it be sure to include
+`-DCROW_ENABLE_COMPRESSION` in your compilation calls. Then call
+`use_compression(crow::compression::algorithm)` on your `crow::App` or
+`crow::SimpleApp` object. Also be sure to include ZLIB as a dependency.
+
+The compression algorithms provided include
+`crow::compression::algorithm::DEFLATE` and
+`crow::compression:algorithm::GZIP`.
+