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Trim README NO_PROXY section to match surrounding granularity

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The block had ballooned to 62 lines while neighboring subsections
(Authentication, Proxy server support, Range, Redirect) are 13-18 each.
Collapse to a single code example + one-line behavior summary; point at
the cookbook for the entry-form details, env-var parsing snippet, and
httpoxy note that used to live inline.
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yhirose
2026-05-24 23:45:49 -04:00
parent 9901a4e1f9
commit 2ad877322b
1 changed files with 4 additions and 55 deletions
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README.md
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@@ -1183,65 +1183,14 @@ cli.set_proxy_bearer_token_auth("pass");
#### Bypass the proxy for specific hosts (`NO_PROXY`)
`set_no_proxy` configures a bypass list. Each pattern is one of:
- `*` — bypass the proxy for every target
- a hostname suffix, e.g. `example.com` — matches `example.com` and any
subdomain (`foo.example.com`). A leading dot (`.example.com`) is
permitted but informational; both forms are equivalent.
- a single IP literal, e.g. `192.168.1.1`, `::1`
- a CIDR block, e.g. `10.0.0.0/8`, `fe80::/10`
```cpp
cli.set_proxy("proxy.corp", 3128);
cli.set_no_proxy({"internal.corp", "10.0.0.0/8", "*.dev.local"});
```
When a NO_PROXY entry matches the target host, the request is sent
directly and the corresponding `Proxy-Authorization` header is
suppressed.
Hostname matching is **case-insensitive** and uses a dot-boundary rule,
so `evilexample.com` does **not** match an entry of `example.com`. IP
comparisons are normalized through `inet_pton`, so `127.0.0.1` cannot
be bypassed via alternate string forms (e.g. leading-zero octets or
decimal-form integers). Malformed entries are silently dropped.
Limitations:
- Port-specific entries (`example.com:8080`) are not supported. cpp-httplib's
other host-keyed APIs (e.g. `set_hostname_addr_map`) are also keyed on
hostname only; supporting host:port for NO_PROXY alone would be
inconsistent.
- IPv4-mapped IPv6 addresses (`::ffff:1.2.3.4`) are not cross-matched
against IPv4 NO_PROXY entries.
- `set_no_proxy` replaces any previously configured list; there is no
append API.
cpp-httplib does **not** read `HTTP_PROXY` / `HTTPS_PROXY` / `NO_PROXY`
itself — this is consistent with `set_ca_cert_path()` and the rest of
the configuration API. If you want that behavior, parse the variables
in your application and pass the bypass patterns to `set_no_proxy()`:
```cpp
if (auto *v = std::getenv("no_proxy"); v && *v) {
std::vector<std::string> patterns;
std::stringstream ss(v);
for (std::string item; std::getline(ss, item, ',');) {
// trim whitespace as needed
if (!item.empty()) { patterns.push_back(std::move(item)); }
}
cli.set_no_proxy(patterns);
}
```
> [!IMPORTANT]
> If you also read `HTTP_PROXY` from the environment, prefer the
> lowercase `http_proxy` only. The uppercase form is poisoned in
> CGI / FastCGI environments by the `Proxy:` request header
> ([CVE-2016-5385 / "httpoxy"](https://httpoxy.org/)). `HTTPS_PROXY`
> and `NO_PROXY` are safe in either case because their names do not
> begin with `HTTP_`.
Each pattern is `*`, a hostname suffix, an IP literal, or a CIDR block.
Hostname matching is case-insensitive with a dot-boundary rule. See the
[NO_PROXY cookbook](https://yhirose.github.io/cpp-httplib/en/cookbook/c16-proxy)
for details and for reading the variable from the environment.
### Range