From 350be3976ad475bc591e97108f7dc11b6fec4bde Mon Sep 17 00:00:00 2001
From: Tobias Kellner <imcybot@gmail.com>
Date: Fri, 15 May 2026 12:57:38 +0200
Subject: [PATCH 1/2] feat: Support sending Blob (and File) instances

---
 lib/XMLHttpRequest.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/XMLHttpRequest.js b/lib/XMLHttpRequest.js
index f37edf0..0ae9da6 100644
--- a/lib/XMLHttpRequest.js
+++ b/lib/XMLHttpRequest.js
@@ -14,6 +14,7 @@
 var fs = require('fs');
 var os = require('os');
 var path = require('path');
+var stream = require('stream');
 var spawn = require('child_process').spawn;
 /**
  * Constants
@@ -727,7 +728,7 @@ function XMLHttpRequest(opts) {
     if (settings.method === "GET" || settings.method === "HEAD") {
       data = null;
     } else if (data) {
-      headers["Content-Length"] = Buffer.isBuffer(data) ? data.length : Buffer.byteLength(data);
+      headers["Content-Length"] = Buffer.isBuffer(data) ? data.length : (data instanceof Blob ? data.size : Buffer.byteLength(data));
 
       var headersKeys = Object.keys(headers);
       if (!headersKeys.some(function (h) { return h.toLowerCase() === 'content-type' })) {
@@ -881,6 +882,9 @@ function XMLHttpRequest(opts) {
 
         // Node 0.4 and later won't accept empty data. Make sure it's needed.
         if (data) {
+          if (data instanceof Blob) {
+            return stream.Readable.fromWeb(data.stream()).pipe(request);
+          }
           request.write(data);
         }
 

From 6f8206c343293fbea7234f8cef9a321287b01cc1 Mon Sep 17 00:00:00 2001
From: Tobias Kellner <imcybot@gmail.com>
Date: Fri, 15 May 2026 18:59:24 +0200
Subject: [PATCH 2/2] test: Add data sending tests

---
 tests/test-send-data.js | 88 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 tests/test-send-data.js

diff --git a/tests/test-send-data.js b/tests/test-send-data.js
new file mode 100644
index 0000000..1bf6679
--- /dev/null
+++ b/tests/test-send-data.js
@@ -0,0 +1,88 @@
+var assert = require("assert")
+  , XMLHttpRequest = require("../lib/XMLHttpRequest").XMLHttpRequest
+  , http = require("http")
+  , xhr;
+
+// Test server
+var server = http.createServer(function (req, res) {
+  if (req.method != "POST") {
+      res.writeHead(405, {"Content-Type": "text/plain"});
+      res.end("Method not allowed");
+      return;
+  }
+  const headers = {"Content-Type": "application/octet-stream"};
+  if (req.headers["content-length"]) {
+    headers["Content-Length"] = req.headers["content-length"];
+  }
+  res.writeHead(200, headers);
+  req.pipe(res);
+}).listen(8000);
+
+// Test wrong method
+xhr = new XMLHttpRequest();
+
+var tests = ['WRONG_METHOD','SEND_TEXT','SEND_BUFFER','SEND_TYPEDARRAY','SEND_BLOB','SEND_FILE'];
+var currentTest = 0;
+
+xhr.onreadystatechange = function() {
+  if (this.readyState == 4) {
+    switch (tests[currentTest]) {
+      case 'WRONG_METHOD':
+        assert.equal(this.status, 405);
+
+        ++currentTest;
+        xhr.open("POST", url);
+        xhr.send("Hello World");
+        return;
+
+      case 'SEND_TEXT':
+        assert.equal(this.status, 200);
+        assert.equal(this.responseText, "Hello World");
+
+        ++currentTest;
+        xhr.open("POST", url);
+        xhr.send(Buffer.from("Hello World"));
+        return;
+
+      case 'SEND_BUFFER':
+        assert.equal(this.status, 200);
+        assert.equal(this.responseText, "Hello World");
+
+        ++currentTest;
+        xhr.open("POST", url);
+        xhr.send(new Uint8Array(Buffer.from("Hello World")));
+        return;
+
+      case 'SEND_TYPEDARRAY':
+        assert.equal(this.status, 200);
+        assert.equal(this.responseText, "Hello World");
+
+        ++currentTest;
+        xhr.open("POST", url);
+        xhr.send(new Blob([Buffer.from("Hello World")]));
+        return;
+
+      case 'SEND_BLOB':
+        assert.equal(this.status, 200);
+        assert.equal(this.responseText, "Hello World");
+
+        ++currentTest;
+        xhr.open("POST", url);
+        xhr.send(new File([Buffer.from("Hello World")], 'test.txt'));
+        return;
+
+      case 'SEND_FILE':
+        assert.equal(this.status, 200);
+        assert.equal(this.responseText, "Hello World");
+        server.close();
+        return;
+
+      default:
+        assert.fail('Unknown state');
+    }
+  }
+};
+
+var url = "http://localhost:8000/";
+xhr.open("GET", url);
+xhr.send();