preserve cache header of origin

gnlow · gnlow · commit e46e3e8caad7 · 2023-12-19T13:33:45.000+09:00
diff --git a/mod.ts b/mod.ts
@@ -15,6 +15,18 @@ const handler =
                     cacheRoot: Deno.cwd(),
                 }
             )
+
+            const originHeaders = await fetch(target).then(x => x.headers)
+
+            const cacheHeaders = Object.fromEntries(
+                [
+                    "cache-control",
+                    "age",
+                    "expires",
+                    "etag",
+                ].map(header => [header, originHeaders.get(header)!])
+            )
+
             return new Response(
                 result.get(target.href) || "",
                 {
@@ -23,6 +35,7 @@ const handler =
                         "content-type": "application/javascript",
                         "access-control-allow-origin": "*",
                         "x-typescript-types": target.href,
+                        ...cacheHeaders,
                     },
                 }
             )    
diff --git a/test/test.html b/test/test.html
@@ -6,7 +6,7 @@
     <body>
         Hello, World!
         <script type="module">
-            import { $ } from "http://tsm.deno.dev/https://deno.land/x/iteruyo@v0.3.0/mod.ts"
+            import { $ } from "http://localhost:8081/https://deno.land/x/iteruyo@v0.3.0/mod.ts"
             $([1, 2, 3, 4, 5])
                 .filter(x => x % 2 === 0)
                 .map(x => x * 2)

Original file line number	Diff line number	Diff line change
`@@ -15,6 +15,18 @@ const handler =`
`15`	`15`	`cacheRoot: Deno.cwd(),`
`16`	`16`	`}`
`17`	`17`	`)`
	`18`	`+`
	`19`	`+ const originHeaders = await fetch(target).then(x => x.headers)`
	`20`	`+`
	`21`	`+ const cacheHeaders = Object.fromEntries(`
	`22`	`+ [`
	`23`	`+ "cache-control",`
	`24`	`+ "age",`
	`25`	`+ "expires",`
	`26`	`+ "etag",`
	`27`	`+ ].map(header => [header, originHeaders.get(header)!])`
	`28`	`+ )`
	`29`	`+`
`18`	`30`	`return new Response(`
`19`	`31`	`result.get(target.href) \|\| "",`
`20`	`32`	`{`
`@@ -23,6 +35,7 @@ const handler =`
`23`	`35`	`"content-type": "application/javascript",`
`24`	`36`	`"access-control-allow-origin": "*",`
`25`	`37`	`"x-typescript-types": target.href,`
	`38`	`+ ...cacheHeaders,`
`26`	`39`	`},`
`27`	`40`	`}`
`28`	`41`	`)`