Optional url for HEAD method

README.md

@@ -189,7 +189,7 @@ The full code of this example is in [example/](./example/).
 
 ## Compiling
 
-To compile this project (only needed if you want to modify the library itself), make sure you have emscripten, then first compile sql.js, then sql.js-httpvfs:
+To compile this project (only needed if you want to modify the library itself), make sure you have emscripten (min. 3.1.0), then first compile sql.js, then sql.js-httpvfs:
 
 ```
 cd sql.js

package.json

@@ -5,7 +5,8 @@
   "license": "Apache-2.0",
   "scripts": {
     "dev": "webpack serve --mode=development",
-    "build": "webpack build --mode=production"
+    "build": "webpack build --mode=production",
+    "build-sql": "cd sql.js && yarn build && cd .. && webpack build --mode=production"
   },
   "dependencies": {
     "comlink": "^4.3.0"
@@ -30,4 +31,4 @@
   "files": [
     "dist/*"
   ]
-}
+}

sql.js/Makefile

@@ -39,8 +39,7 @@ EMFLAGS = \
 	-s EXTRA_EXPORTED_RUNTIME_METHODS=@src/exported_runtime_methods.json \
 	-s SINGLE_FILE=0 \
 	-s NODEJS_CATCH_EXIT=0 \
-	-s NODEJS_CATCH_REJECTION=0 \
-	-s LEGACY_RUNTIME=1
+	-s NODEJS_CATCH_REJECTION=0
 
 #	-s ASYNCIFY=1 \
 #	-s ASYNCIFY_IMPORTS='["sqlite3VdbeExec"]'

src/lazyFile.ts

@@ -6,7 +6,7 @@
 export type RangeMapper = (
   fromByte: number,
   toByte: number
-) => { url: string; fromByte: number; toByte: number };
+) => { url: string; headUrl: string; fromByte: number; toByte: number };
 
 export type RequestLimiter = (bytes: number) => void;
 
@@ -169,7 +169,7 @@ export class LazyUint8Array {
   /** verify the server supports range requests and find out file length */
   private checkServer() {
     var xhr = new XMLHttpRequest();
-    const url = this.rangeMapper(0, 0).url;
+    const url = this.rangeMapper(0, 0).headUrl;
     // can't set Accept-Encoding header :( https://stackoverflow.com/questions/41701849/cannot-modify-accept-encoding-with-fetch
     xhr.open("HEAD", url, false);
     // // maybe this will help it not use compression?

src/sqlite.worker.ts

@@ -1,10 +1,10 @@
 /// <reference path="./types.d.ts" />
 
 import * as Comlink from "comlink";
+import { Database, QueryExecResult } from "sql.js";
 import initSqlJs from "../sql.js/dist/sql-wasm.js";
 import wasmUrl from "../sql.js/dist/sql-wasm.wasm";
 import { createLazyFile, LazyUint8Array, PageReadLog, RangeMapper } from "./lazyFile";
-import { Database, QueryExecResult } from "sql.js";
 import { SeriesVtab, sqlite3_module, SqljsEmscriptenModuleType } from "./vtab";
 
 wasmUrl;
@@ -71,6 +71,7 @@ export type SplitFileConfigInner = {
   | {
       serverMode: "full";
       url: string;
+      headUrl?: string;
     }
 );
 export interface LazyHttpDatabase extends Database {
@@ -115,6 +116,7 @@ async function fetchConfigs(
             : {
                 ...configOut,
                 url: new URL(configOut.url, configUrl).toString(),
+                headUrl: configOut.headUrl ? new URL(configOut.headUrl, configUrl).toString() : new URL(configOut.url, configUrl).toString(),
               },
         virtualFilename: config.virtualFilename,
       } as SplitFileConfigPure;
@@ -171,13 +173,15 @@ const mod = {
           const serverTo = serverFrom + (to - from);
           return {
             url: config.urlPrefix + String(serverChunkId).padStart(config.suffixLength, "0") + suffix,
+            headUrl: config.headUrl ?? config.urlPrefix + String(serverChunkId).padStart(config.suffixLength, "0") + suffix,
             fromByte: serverFrom,
             toByte: serverTo,
           };
         };
       } else {
         rangeMapper = (fromByte, toByte) => ({
           url: config.url + suffix,
+          headUrl: config.headUrl ? config.headUrl + suffix : config.url + suffix,
           fromByte,
           toByte,
         });
@@ -189,7 +193,7 @@ const mod = {
         mainVirtualFilename = filename;
         mainFileConfig = config
       }
-      console.log("filename", filename);
+
       console.log("constructing url database", id, "filename", filename);
       const lazyFile = createLazyFile(sql.FS, "/", filename, true, true, {
         rangeMapper,