diff --git a/src/lua/header_filter.lua b/src/lua/header_filter.lua
index 6dcfeef..f1735f2 100644
--- a/src/lua/header_filter.lua
+++ b/src/lua/header_filter.lua
@@ -1,3 +1,4 @@
+-- Determine if we rewrite the body of this type of content
 if ngx.header["Content-Type"] then
     local content_type = ngx.header["Content-Type"]
     if content_type:find("text/html") or
@@ -12,3 +13,20 @@ if ngx.header["Content-Type"] then
         ngx.header["Content-Length"] = nil
     end
 end
+
+-- Rewrite any redirects from the origin to point at a mirror
+if ngx.header["Location"] then
+    if ngx.ctx.jasima_pool_map and not ngx.ctx.jasima_config.rewrite_disable then
+        local location = ngx.header["Location"]
+        for from, to in pairs(ngx.ctx.jasima_pool_map) do
+            if ngx.ctx.jasima_config.rewrite_case_insensitive then
+                local pattern = ngx.re.escape(from)
+                location = ngx.re.gsub(location, pattern, to, "ijo")
+            else
+                local pattern = from:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1") -- escape Lua patterns
+                location = location:gsub(pattern, to)
+            end
+        end
+        ngx.header["Location"] = location
+    end
+end
\ No newline at end of file