Hands-On Microservices with Rust

Parsing a query

The HTTP URI can contain a query string with parameters that we can use to tune a request. The Request type has a method, uri, which returns a query string if it's available. We added the queryst crate, which parses a query string to serde_json::Value. We'll use this value to extract the "format" parameters from the query string. If the format isn't provided, we'll use "json" as a default value. Add the format-extracting block to the branch that handles requests to the /random path and use the serialize function that we previously declared:

(&Method::POST, "/random") => {    let format = {        let uri = req.uri().query().unwrap_or("");        let query = queryst::parse(uri).unwrap_or(Value::Null); query["format"].as_str().unwrap_or("json").to_string() ...