introduce flag for enabling redirect cache

packages/prerender-fargate/README.md

@@ -1,15 +1,18 @@
 # Prerender in Fargate
-A construct to host [Prerender](https://github.com/prerender/prerender) in Fargate. 
+
+A construct to host [Prerender](https://github.com/prerender/prerender) in Fargate.
 
 ## Props
- - `prerenderName`: Name of the Prerender service
- - `domainName`: Domain name for Prerender
- - `vpcId`: VPC to host Prerender in
- - `bucketName`: Optional S3 bucket name
- - `expirationDays`: Optional days until items expire in bucket (default to 7 days)
- - `tokenList`: List of tokens to accept as authentication
- - `certificateArn`: Certificate arn to match the domain
- - `desiredInstanceCount`: Number of Prerender instances to run (default 1)
- - `maxInstanceCount`: Maximum number of Prerender instances to run (default 2)
- - `instanceCPU`: CPU to allocate to each instance (default 512)
- - `instanceMemory`: Amount of memory to allocate to each instance (default 1024)
+
+- `prerenderName`: Name of the Prerender service
+- `domainName`: Domain name for Prerender
+- `vpcId`: VPC to host Prerender in
+- `bucketName`: Optional S3 bucket name
+- `expirationDays`: Optional days until items expire in bucket (default to 7 days)
+- `tokenList`: List of tokens to accept as authentication
+- `certificateArn`: Certificate arn to match the domain
+- `desiredInstanceCount`: Number of Prerender instances to run (default 1)
+- `maxInstanceCount`: Maximum number of Prerender instances to run (default 2)
+- `instanceCPU`: CPU to allocate to each instance (default 512)
+- `instanceMemory`: Amount of memory to allocate to each instance (default 1024)
+- `enableRedirectCache`: Cache 301 and 302 responses, too (default false)

packages/prerender-fargate/lib/prerender-fargate.ts

@@ -22,6 +22,7 @@ export interface PrerenderOptions {
     maxInstanceCount?: number,
     instanceCPU?: number,
     instanceMemory?: number
+    enableRedirectCache?: string
 }
 
 export class PrerenderFargate extends Construct {
@@ -80,6 +81,7 @@ export class PrerenderFargate extends Construct {
                         AWS_ACCESS_KEY_ID: accessKey.accessKeyId,
                         AWS_SECRET_ACCESS_KEY: accessKey.secretAccessKey.toString(),
                         AWS_REGION: Stack.of(this).region,
+                        ENABLE_REDIRECT_CACHE: props.enableRedirectCache || "false",
                         TOKEN_LIST: props.tokenList.toString()
                     }
                 },

packages/prerender-fargate/lib/prerender/server.js

@@ -37,7 +37,7 @@ server.use({
 
 server.use(prerender.blacklist());
 
-if (process.env.ENABLE_CACHE_FOR_REDIRECTION){
+if (process.env.ENABLE_REDIRECT_CACHE.toLowerCase() === 'true'){
     server.use(prerender.removeScriptTags());
     var he = require('he');
     var s3 = new (require('aws-sdk')).S3({params:{Bucket: process.env.S3_BUCKET_NAME}});