为什么 ring 的资源响应以 application/octet-stream 内容类型响应？

Question

我想弄清楚为什么 Ring 的 resource-response 选择使用 application/octet-stream 内容类型进行响应。我最近更新了一些我一直在学习的示例代码，以便它使用更新的 ring-defaults。在使用 ring-defaults 之前，此代码使用 html 内容类型进行响应。为什么现在选择 octet-stream？

(ns replays.handler
  (:require [compojure.core :refer [GET defroutes]]
            [compojure.route :as route]
            [ring.util.response :refer [response resource-response]]
            [ring.middleware.json :as middleware]
            [ring.middleware.defaults :refer [wrap-defaults api-defaults]]))

(defroutes app-routes
  (GET  "/" [] (resource-response "index.html" {:root "public"}))
  (GET  "/widgets" [] (response [{:name "Widget 1"} {:name "Widget 2"}]))
  (route/resources "/public")
  (route/not-found "not found"))

(def app
  (-> app-routes
      (middleware/wrap-json-body)
      (middleware/wrap-json-response)
      (wrap-defaults api-defaults)))

并且，对于版本号，这是项目文件...

(defproject replays "0.1.0-SNAPSHOT"

  :url "http://example.com/FIXME"
  :description "FIXME: write description"

  :plugins [[lein-pdo "0.1.1"]
            [lein-ring "0.9.3"]
            [lein-cljsbuild "1.0.5"]]

  :dependencies [[org.clojure/clojure "1.6.0"]
                 [org.clojure/core.async "0.1.346.0-17112a-alpha"]
                 [org.clojure/clojurescript "0.0-3126"]
                 [org.omcljs/om "0.8.8"]
                 [ring/ring-core "1.3.2"]
                 [ring/ring-json "0.3.1"]
                 [ring/ring-defaults "0.1.4"]
                 [compojure "1.3.2"]
                 [cljs-http "0.1.29"]]

  :source-paths ["src/clj"]

  :ring {:handler replays.handler/app}

  :cljsbuild {:builds [{:id "dev"
                        :source-paths ["src/cljs"]
                        :compiler {:output-to "resources/public/js/app.js"
                                   :output-dir "resources/public/js/out"
                                   :optimizations :none
                                   :source-map true}}]}

  :aliases {"up" ["pdo" "cljsbuild" "auto" "dev," "ring" "server-headless"]}

  :profiles {:dev {:dependencies [[javax.servlet/servlet-api "2.5"]
                                  [ring-mock "0.1.5"]]}})

Answer 1

这是因为 api-defaults（实际上是 ring.middleware.content-type）试图根据您传递给它的数据来猜测您的内容类型。它使用文件扩展名来执行此操作，并且由于您使用的是 resource-response，所以没有扩展名。所以默认情况下 ring.middleware.content-type 使用 application/octet-stream.

解决方案是向响应提供您的内容类型，如下所示：

(ns app.routes
  (:require [compojure.core :refer [defroutes GET]]
            [ring.util.response :as resp]))

(defroutes appRoutes
  ;; ...
  ;; your routes
  ;; ...
  (GET "/"
       resp/content-type (resp/resource-response "index.html" {:root "public"}) "text/html"))

为什么 ring 的资源响应以 application/octet-stream 内容类型响应？

Why does ring's resource-response respond with application/octet-stream content type?

clojure

compojure

ring