diff --git a/frontend/server/routes/handlers/create-execution-handler.js b/frontend/server/routes/handlers/create-execution-handler.js
index 43bd1320..e03272dd 100644
--- a/frontend/server/routes/handlers/create-execution-handler.js
+++ b/frontend/server/routes/handlers/create-execution-handler.js
@@ -104,7 +104,8 @@ async function securePipeline(req, requestContent) {
       "value": entry["value"],
     };
   } else if (remote !== undefined) {
-    const content = await httpGetContentJsonLd(remote);
+    const sanitizedUrl  = encodeURI(decodeURI(remote));
+    const content = await httpGetContentJsonLd(sanitizedUrl);
     return {
       "contentType": CONTENT.JSONLD,
       "fileName": "pipeline.jsonld",
diff --git a/frontend/server/routes/handlers/http-request.js b/frontend/server/routes/handlers/http-request.js
index 1f0280e6..54da6184 100644
--- a/frontend/server/routes/handlers/http-request.js
+++ b/frontend/server/routes/handlers/http-request.js
@@ -18,7 +18,7 @@ async function httpGetContent(url, accept) {
     "headers": {
       "accept": accept,
     },
-    "url": sanitizeUrl(url),
+    "url": url,
   };
   return new Promise((resolve, reject) => {
     request.get(options, (error, response, body) => {
@@ -31,13 +31,6 @@ async function httpGetContent(url, accept) {
   });
 }
 
-/**
- * Required to make it work with national characters in URL.
- */
-function sanitizeUrl(url) {
-  return encodeURI(decodeURI(url));
-}
-
 /**
  * Each part must contain: value, contentType and fileName.
  */
@@ -56,7 +49,7 @@ function httpPostContent(url, parts, headers) {
     }));
   }
   const options = {
-    "url": sanitizeUrl(url),
+    "url": url,
     "headers": headers,
     "formData": formData
   };
@@ -65,7 +58,7 @@ function httpPostContent(url, parts, headers) {
 
 function httpGetForProxy(url, req, res, extra = {}) {
   const options = {
-    "url": sanitizeUrl(url),
+    "url": url,
     "headers": extra.headers ?? req.headers,
     "qs": extra.query ?? req.query,
   };
@@ -86,7 +79,7 @@ function handleConnectionError(url, error, res) {
 
 function httpPostForProxy(url, req, res) {
   const options = {
-    "url": sanitizeUrl(url),
+    "url": url,
     "headers": req.headers,
     "qs": req.query,
     "form": req.body,
@@ -98,7 +91,7 @@ function httpPostForProxy(url, req, res) {
 
 function httpDeleteForProxy(url, req, res, extra = {}) {
   const options = {
-    "url": sanitizeUrl(url),
+    "url": url,
     "headers": extra.headers ?? req.headers,
     "qs": extra.query ?? req.query,
   };
@@ -109,7 +102,7 @@ function httpDeleteForProxy(url, req, res, extra = {}) {
 
 function httpPutContent(url, req, res, extra = {}) {
   const options = {
-    "url": sanitizeUrl(url),
+    "url": url,
     "qs": req.query,
     "formData": extra?.formData,
   };
@@ -120,7 +113,7 @@ function httpPutContent(url, req, res, extra = {}) {
 
 function httpPutForProxy(url, req, res) {
   const options = {
-    "url": sanitizeUrl(url),
+    "url": url,
     "qs": req.query,
     "form": req.body
   };
diff --git a/frontend/server/routes/handlers/import-handler.js b/frontend/server/routes/handlers/import-handler.js
index 984f5869..a47e2572 100644
--- a/frontend/server/routes/handlers/import-handler.js
+++ b/frontend/server/routes/handlers/import-handler.js
@@ -82,8 +82,8 @@ async function secureContent(req, requestContent) {
       "value": entry["value"],
     }];
   } else if (req.query["iri"] !== undefined) {
-    const url = req.query["iri"];
-    const content = await httpGetContentJsonLd(url);
+    const sanitizedUrl  = encodeURI(decodeURI(req.query["iri"]));
+    const content = await httpGetContentJsonLd(sanitizedUrl);
     return [{
       "contentType": CONTENT.JSONLD,
       "fileName": "content.jsonld",
diff --git a/frontend/server/routes/handlers/localize-handler.js b/frontend/server/routes/handlers/localize-handler.js
index 56478069..351f2381 100644
--- a/frontend/server/routes/handlers/localize-handler.js
+++ b/frontend/server/routes/handlers/localize-handler.js
@@ -26,8 +26,8 @@ async function handleLocalize(req, res) {
   }
   const url = STORAGE_API_URL + "/management/localize";
   const parts = {
-    "options": options,
-    "content": content,
+    "options": [options],
+    "content": [content],
   };
   const headers = {
     "accept": req.headers["accept"] ?? CONTENT.JSONLD,
@@ -81,8 +81,8 @@ async function secureContent(req, requestContent) {
       "value": entry["value"],
     };
   } else if (req.query["iri"] !== undefined) {
-    const url = req.query["iri"];
-    const content = await httpGetContentJsonLd(url);
+    const sanitizedUrl  = encodeURI(decodeURI(req.query["iri"]));
+    const content = await httpGetContentJsonLd(sanitizedUrl);
     return {
       "contentType": CONTENT.JSONLD,
       "fileName": "content.jsonld",