You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: request_items.rs
    path of file: ./repos/xh/src
    
    the code of the file until where you have to start completion: use std::{
    borrow::Cow,
    collections::HashSet,
    fs::{self, File},
    io,
    path::{Path, PathBuf},
    str::FromStr,
};

use anyhow::{anyhow, Result};
use reqwest::header::{HeaderMap, HeaderName, HeaderValue};
use reqwest::{blocking::multipart, Method};

use crate::cli::BodyType;
use crate::nested_json;
use crate::utils::{expand_tilde, unescape};

    
    pub fn is_empty(&self) -> bool {
        match self {
            Body::Json(value) => value.is_null(),
            Body::Form(items) => items.is_empty(),
            // A multipart form without items isn't empty, and we can't read
            // a body from stdin because it has to match the header, so we
            // should never consider this "empty"
            // This is a slight divergence from HTTPie, which will simply
            // discard stdin if it receives --multipart without request items,
            // but that behavior is useless so there's no need to match it
            Body::Multipart(..) => false,
            Body::File { .. } => false,
            Body::Raw(..) => false,
        }
    }