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//! # PbO
//!
//! `lead-oxide` is a wrapper around pubproxy.com's public proxy API.
//!
//! `lead-oxide` strives to make it impossible to use the API incorrectly while still making regular
//! usage as ergonomic as possible.
//!
//! ## Keyless API Limitations
//!
//! ### Daily Limit
//!
//! At the time of writing this without an API key the pubproxy API limits users to 5 proxies per
//! request and 50 requests per day. The maximum proxies per request is always used to minimize rate
//! limiting along with getting the most proxies possible within the request limit meaning you
//! should get 250 proxies per day without needing an API key.
//!
//! ### Rate Limiting
//!
//! Without an API key pubproxy limits users to one request per second so a `Fetcher` will try to
//! ensure that at most only one request per second is done without an API key. This is synchronized
//! between fetchers including across different threads: however, there can still be issues from
//! running multiple programs from the same IP causing rate limiting to occur. The rate-limiting is
//! quite severe (will deny requests for potentially several hours), so it's best to avoid by all
//! means possible.
//!
//! ## Quickstart
//!
//! ```rust,no_run
//! use iso_country::Country;
//! use lead_oxide::{
//! errors::ApiError,
//! fetcher::Fetcher,
//! opts::Opts,
//! types::{Countries, Level, Protocol, TimeToConnect},
//! };
//!
//! use std::{convert::TryFrom, time::Duration};
//!
//! fn main() -> Result<(), ApiError> {
//! // Fetcher for SOCKS5 proxies located in the US and Canada that support POST requests
//! let mut socks_fetcher = Fetcher::new(
//! Opts::builder()
//! .protocol(Protocol::Socks5)
//! .countries(Countries::allow().countries(&[Country::US, Country::CA]))
//! .post(true)
//! .build(),
//! );
//!
//! // Fetcher for Elite HTTPS proxies that connected in 15 seconds or less
//! let mut https_fetcher = Fetcher::new(
//! Opts::builder()
//! .protocol(Protocol::Http)
//! .https(true)
//! .level(Level::Elite)
//! .time_to_connect(TimeToConnect::try_from(Duration::from_secs(15)).unwrap())
//! .build(),
//! );
//!
//! // Get one SOCKS proxy and 10 HTTPS proxies
//! let socks_proxy = &socks_fetcher.try_get(1)?[0];
//! let https_proxies = https_fetcher.try_get(10)?;
//!
//! println!("SOCKS proxy: {:#?}", socks_proxy);
//! println!("HTTPS proxies {:#?}", https_proxies);
//!
//! Ok(())
//! }
//! ```
extern crate lazy_static;