diff --git a/src/api/response/iiif/collection.js b/src/api/response/iiif/collection.js
index b071141f..5f4e0723 100644
--- a/src/api/response/iiif/collection.js
+++ b/src/api/response/iiif/collection.js
@@ -102,11 +102,19 @@ function homepageUrl(pageInfo) {
     result = new URL(`/collections/${collectionId}`, dcUrl());
   } else {
     result = new URL("/search", dcUrl());
-    if (pageInfo.options?.queryStringParameters?.query)
+    if (pageInfo.options?.queryStringParameters?.query) {
       result.searchParams.set(
         "q",
         pageInfo.options.queryStringParameters.query
       );
+    }
+
+    if (pageInfo.query_url.includes("similar")) {
+      // Grab the work id from the query_url and add it to the search params
+      const regex = /works\/(.*)\/similar/;
+      const found = pageInfo.query_url.match(regex);
+      result.searchParams.set("similar", found[1]);
+    }
   }
 
   return result;
diff --git a/src/helpers.js b/src/helpers.js
index 7a5d6bf3..f5b6f384 100644
--- a/src/helpers.js
+++ b/src/helpers.js
@@ -37,6 +37,19 @@ const AcceptableHeaders = [
   "X-Forwarded-Port",
   "X-Requested-With",
 ];
+
+const ExposedHeaders = [
+  "Cache-Control",
+  "Content-Language",
+  "Content-Length",
+  "Content-Type",
+  "Date",
+  "ETag",
+  "Expires",
+  "Last-Modified",
+  "Pragma",
+];
+
 const TextTypes = new RegExp(/^(application\/(json|(.+\+)?xml)$|text\/)/);
 
 function addCorsHeaders(event, response) {
@@ -44,8 +57,9 @@ function addCorsHeaders(event, response) {
   const corsHeaders = {
     "Access-Control-Allow-Origin": allowOrigin,
     "Access-Control-Allow-Headers": AcceptableHeaders.join(", "),
-    "Access-Control-Allow-Methods": "POST, GET, OPTIONS",
+    "Access-Control-Allow-Methods": "POST, GET, HEAD, OPTIONS",
     "Access-Control-Allow-Credentials": "true",
+    "Access-Control-Expose-Headers": ExposedHeaders.join(", "),
     "Access-Control-Max-Age": "600",
   };
   if (!response.headers) response.headers = {};
@@ -169,6 +183,11 @@ function normalizeHeaders(event) {
 
 function baseUrl(event) {
   event = normalizeHeaders(event);
+
+  // For use with the local https-proxy in dev mode
+  if (event.headers["x-forwarded-base"])
+    return event.headers["x-forwarded-base"];
+
   const scheme = event.headers["x-forwarded-proto"];
 
   // The localhost check only matters in dev mode, but it's
diff --git a/test/unit/api/response/iiif/collection.test.js b/test/unit/api/response/iiif/collection.test.js
index 034c548f..0883408c 100644
--- a/test/unit/api/response/iiif/collection.test.js
+++ b/test/unit/api/response/iiif/collection.test.js
@@ -54,4 +54,31 @@ describe("IIIF Collection response transformer", () => {
     expect(body.status).to.eq(404);
     expect(body.error).to.be.a("string");
   });
+
+  it("handles a request including /similar route", async () => {
+    let pagerWorkSimilar = new Paginator(
+      "http://dcapi.library.northwestern.edu/api/v2/",
+      "works/1234/similar",
+      ["works"],
+      { query: { query_string: { query: "genre.label:architecture" } } },
+      "iiif",
+      {
+        includeToken: false,
+        queryStringParameters: {
+          collectionLabel: "The collection label",
+          collectionSummary: "The collection Summary",
+        },
+      }
+    );
+
+    const response = {
+      statusCode: 200,
+      body: helpers.testFixture("mocks/search.json"),
+    };
+    const result = await transformer.transform(response, pagerWorkSimilar);
+    expect(result.statusCode).to.eq(200);
+
+    const body = JSON.parse(result.body);
+    expect(body.homepage[0].id).to.contain("search?similar=1234");
+  });
 });