diff --git a/src/httpfetch.cpp b/src/httpfetch.cpp
index 1f9f9b96d..2e1dd54da 100644
--- a/src/httpfetch.cpp
+++ b/src/httpfetch.cpp
@@ -20,6 +20,10 @@ You should have received a copy of the GNU General Public License
 along with Freeminer.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#if defined(__EMSCRIPTEN__)
+#include <emscripten/fetch.h>
+#endif
+
 #include "httpfetch.h"
 #include "porting.h" // for sleep_ms(), get_sysinfo(), secure_rand_fill_buf()
 #include <iostream>
@@ -810,6 +814,19 @@ static void httpfetch_request_clear(u64 caller)
 void httpfetch_sync(const HTTPFetchRequest &fetch_request,
 		HTTPFetchResult &fetch_result)
 {
+// https://github.com/emscripten-core/emscripten/issues/4906
+#if defined(__EMSCRIPTEN__)
+    emscripten_fetch_attr_t attr;
+    emscripten_fetch_attr_init(&attr);
+    strcpy(attr.requestMethod, "GET");
+    attr.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY | EMSCRIPTEN_FETCH_SYNCHRONOUS;
+    auto *fetch = emscripten_fetch(&attr, fetch_request.url.c_str());
+	fetch_result.response_code = fetch->status;
+	fetch_result.succeeded = fetch_result.response_code == 200;
+	fetch_result.data = std::string((const char *)fetch->data, fetch->numBytes);
+	// errorstream << "emsfetch=" << fetch_result.response_code << " " << fetch_result.succeeded << " : " <<  readBuffer.size() << "\n";
+    emscripten_fetch_close(fetch);
+#else
 	// Create ongoing fetch data and make a cURL handle
 	// Set cURL options based on HTTPFetchRequest
 	CurlHandlePool pool;
@@ -818,6 +835,7 @@ void httpfetch_sync(const HTTPFetchRequest &fetch_request,
 	CURLcode res = ongoing.start(NULL);
 	// Update fetch result
 	fetch_result = *ongoing.complete(res);
+#endif
 }
 
 #else  // USE_CURL
diff --git a/src/mapgen/earth/hgt.cpp b/src/mapgen/earth/hgt.cpp
index ff2f1c2c1..03655f819 100644
--- a/src/mapgen/earth/hgt.cpp
+++ b/src/mapgen/earth/hgt.cpp
@@ -227,15 +227,18 @@ const auto http_to_file = [](const std::string &url, const std::string &zipfull)
 
 	actionstream << req.url << " " << res.succeeded << " " << res.response_code << " "
 				 << res.data.size() << "\n";
-	if (!res.succeeded || res.response_code >= 300)
+	if (!res.succeeded || res.response_code >= 300) {
 		return uintmax_t{0};
+	}
 
-	if (!res.data.size())
+	if (!res.data.size()) {
 		return uintmax_t{0};
+	}
 
 	std::ofstream(zipfull) << res.data;
-	if (!std::filesystem::exists(zipfull))
+	if (!std::filesystem::exists(zipfull)) {
 		return uintmax_t{0};
+	}
 	return std::filesystem::file_size(zipfull);
 };
 
@@ -394,7 +397,13 @@ bool height_hgt::load(ll_t lat, ll_t lon)
 		fs::CreateAllDirs(ffolder);
 		multi_http_to_file(zstfile,
 				{
-						"http://cdn.freeminer.org/earth/" + zstfile,
+#if defined(__EMSCRIPTEN__)
+						"/"
+#else
+						"http://cdn.freeminer.org/"
+#endif
+						"earth/" +
+								zstfile,
 				},
 				zstdfull);
 		if (std::filesystem::exists(zstdfull) && std::filesystem::file_size(zstdfull)) {
@@ -438,6 +447,7 @@ bool height_hgt::load(ll_t lat, ll_t lon)
 	//#if 1 //!defined(_WIN32)
 	// DUMP(filefull, zipfull);
 
+#if !defined(_WIN32) && !defined(__ANDROID__) && !defined(__EMSCRIPTEN__)
 	if (srtmTile.empty() && !std::filesystem::exists(filefull)) {
 
 		// TODO: https://viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org15.htm
@@ -466,7 +476,7 @@ bool height_hgt::load(ll_t lat, ll_t lon)
 			set_ratio(filesize);
 		}
 	}
-	//#endif
+#endif
 
 	// TODO: first try load unpached file, then unpack zip
 	if (srtmTile.empty()) {