diff --git a/frontend/nginx.conf b/frontend/nginx.conf
index 024e2cb..015b32e 100644
--- a/frontend/nginx.conf
+++ b/frontend/nginx.conf
@@ -22,7 +22,7 @@ server {
     # (acceso directo al puerto 8073 sin pasar por Apache).
 
     location ^~ /flintstones/ {
-        rewrite ^/flintstones/(.*)$ /$1 break;
+        rewrite ^/flintstones/(.*)$ /$1 last;
         try_files $uri $uri/ /index.html;
     }
 
@@ -31,7 +31,7 @@ server {
     }
 
     location ^~ /orcid2sword/ {
-        rewrite ^/orcid2sword/(.*)$ /$1 break;
+        rewrite ^/orcid2sword/(.*)$ /$1 last;
         try_files $uri $uri/ /index.html;
     }
 
diff --git a/frontend/src/services/api.js b/frontend/src/services/api.js
index a192494..390987e 100644
--- a/frontend/src/services/api.js
+++ b/frontend/src/services/api.js
@@ -34,7 +34,7 @@ import {
 // de Vite. En ese caso no queremos usar string vacío como base, sino `/api`.
 const BASE_URL = (import.meta.env.VITE_API_URL
   ? import.meta.env.VITE_API_URL
-  : "/api").replace(/\/$/, "");
+  : `${import.meta.env.BASE_URL}api`).replace(/\/$/, "");
 const API_KEY = import.meta.env.VITE_API_KEY ?? "";
 
 const USE_MOCKS = import.meta.env.VITE_USE_MOCKS === "true";
diff --git a/frontend/vite.config.js b/frontend/vite.config.js
index ec5c921..a1b565e 100644
--- a/frontend/vite.config.js
+++ b/frontend/vite.config.js
@@ -17,6 +17,13 @@ export default defineConfig(({ mode }) => {
       proxy: {
         '/api': { target: proxyTarget, changeOrigin: true },
         '/health': { target: proxyTarget, changeOrigin: true },
+        ...(base !== '/' && {
+          [`${base}api`]: {
+            target: proxyTarget,
+            changeOrigin: true,
+            rewrite: (path) => path.replace(new RegExp(`^${base}api`), '/api')
+          }
+        }),
       },
     },
   }