Function encode_query_param 

pub fn encode_query_param(s: impl AsRef<str>) -> String

Encodes a query parameter name or value using + for spaces.

This function follows the application/x-www-form-urlencoded encoding format, which is commonly used in HTML form submissions. The key difference from encode_uri_component is that spaces are encoded as + instead of %20.

Preserved Characters

The following characters are passed through unchanged:

• Unreserved: A-Z, a-z, 0-9, -, _, ., !, ~, *, ', (, )
• Reserved: ;, ,, /, ?, :, @, &, =, +, $, #

Spaces are converted to +, and all other characters are percent-encoded.

Use Cases

Use this function when building query strings that will be submitted as form data or when you want the more compact + encoding for spaces.

Examples

use uri_encode::encode_query_param;

// Spaces become +
assert_eq!(encode_query_param("hello world"), "hello+world");

// Building a query string
let name = "John Doe";
let city = "New York";
let query = format!("name={}&city={}", encode_query_param(name), encode_query_param(city));
assert_eq!(query, "name=John+Doe&city=New+York");