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* Add Server::CustomRoute() for HTTP methods outside the built-in set parse_request_line validates the request method against a fixed whitelist and rejects anything else with 400 before routing runs. That blocks WebDAV, where PROPFIND, PROPPATCH, MKCOL, COPY, MOVE, LOCK and UNLOCK are ordinary methods defined by RFC 4918, and it blocks extension methods such as UPnP's SUBSCRIBE. The need has been open since #847. Registering a handler is now what makes the server accept a method: svr.CustomRoute("PROPFIND", "/dav/:id", handler); Because custom methods go through the normal dispatch path, patterns work the way they do for Get() and friends, and the request body is available in req.body. Serving these methods through set_pre_routing_handler was never enough: the body has not been read at that point, so PROPPATCH and LOCK, which require one, could not be implemented at all. A HandlerWithContentReader overload is available too. The content reader gate in routing() also fires when a custom method carries no body, matching what expect_content() does unconditionally for POST/PUT/PATCH/DELETE, so a body-less PROPFIND (RFC 4918 treats one as allprop) reaches its handler instead of falling through to 404. Method names are validated as RFC 9110 tokens, and the ten built-in methods are refused. Seven of them are dispatched by the if/else chain in routing() before the custom tables are consulted, so a route registered for one could never fire; CONNECT, TRACE and PRI carry protocol-level meaning this library does not route. A refused registration makes is_valid() return false, so listen() fails rather than starting a server holding a handler that would never run. This is also why SSLServer::is_valid() now chains to Server::is_valid() instead of only checking ctx_. Servers that never call CustomRoute() keep the previous per-request cost: the built-in method set is checked first and short-circuits, and the custom lookup returns early on an empty map. * Add cookbook recipe for custom HTTP methods The CustomRoute() docs were a section inside S01, which pushed that page to 90 lines, the longest in the cookbook, and mixed a separate feature into a page about registering GET/POST/PUT/DELETE handlers. Move the section into its own recipe and give it room for the part that was missing: the OPTIONS handler returning DAV: and Allow, which WebDAV clients probe for before anything else. S01 goes back to 68 lines and keeps a pointer to the new page. The recipe is titled after the API rather than after WebDAV, and says outright that generating the 207 Multi-Status XML, interpreting Depth and managing locks are the reader's job. Routing the method is all the library does. S23 takes order 42, so the TLS, SSE and WebSocket recipes shift to 43-57. That only moves the sort key. Filenames, the T01/E01/W01 labels, the published URLs and every cross-reference are untouched.
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3.3 KiB
title, order, status
| title | order | status |
|---|---|---|
| S23. カスタムHTTPメソッドを扱う | 42 | draft |
サーバーは知らないHTTPメソッドを400 Bad Requestで弾きます。RFC 4918のWebDAVメソッド（PROPFIND、PROPPATCH、MKCOLなど）やUPnPのSUBSCRIBEのような拡張メソッドを受け付けたいときは、CustomRoute()でハンドラを登録してください。登録したことがそのまま「このメソッドを受け付ける」という意味になります。
基本の使い方
svr.CustomRoute("PROPFIND", "/dav/:id",
[](const httplib::Request &req, httplib::Response &res) {
// リクエストボディも通常どおり読める
auto id = req.path_params.at("id");
res.status = httplib::StatusCode::MultiStatus_207;
res.set_content(build_multistatus(req.body), "application/xml");
});
パターンの書き方はGet()などと同じです。正規表現もパスパラメーターもそのまま使えます。
OPTIONSで対応メソッドを知らせる
WebDAVクライアントは接続すると、まずOPTIONSでサーバーの能力を問い合わせます。cpp-httplibはDAV:ヘッダーもAllowヘッダーも自動生成しないので、自分で返してください。ここを忘れると、PROPFINDが正しく動いてもクライアントに拒否されます。
svr.Options("/dav/.*", [](const httplib::Request &req, httplib::Response &res) {
res.set_header("DAV", "1");
res.set_header("Allow", "OPTIONS, GET, HEAD, PROPFIND, PROPPATCH, MKCOL");
});
ボディをストリーミングで受け取る
Post()などと同じく、Content Reader版のオーバーロードがあります。大きなXMLを一度にメモリへ載せたくないときに使ってください。
svr.CustomRoute("REPORT", "/dav/.*",
[](const httplib::Request &req, httplib::Response &res,
const httplib::ContentReader &content_reader) {
content_reader([&](const char *data, size_t data_length) {
// 少しずつ処理する
return true;
});
res.status = httplib::StatusCode::MultiStatus_207;
});
覚えておくこと
- メソッド名はHTTPのトークン（RFC 9110）である必要があります。
listen()より前に登録してください GET、HEAD、POST、PUT、DELETE、CONNECT、OPTIONS、TRACE、PATCH、PRIは登録できません。これらには専用のメソッドを使ってください- 登録が拒否されると
is_valid()がfalseになり、listen()が失敗します。呼ばれないハンドラを抱えたままサーバーが起動することはありません - 静的ファイルの配信とWebSocketのアップグレードは
GET/HEADのままです
Note: cpp-httplibが用意するのはメソッドのルーティングまでです。WebDAVを名乗るなら、
207 Multi-StatusのXML生成、Depthヘッダーの解釈、ロックの管理は自分で実装することになります。プロトコルの本体はライブラリの外側です。
ハンドラ登録の基本はS01. GET / POST / PUT / DELETEハンドラを登録するを参照してください。