diff --git a/electron/main.ts b/electron/main.ts
index 85472f4..52250e6 100644
--- a/electron/main.ts
+++ b/electron/main.ts
@@ -25,6 +25,7 @@ import { Online } from './online.js'
 import type { OnlineState } from '../src/types/online.js'
 import { PackageStore } from './package-store.js'
 import { packageMediaResponse } from './package-media.js'
+import { prepareFetchHeaders } from './response-headers.js'
 import type { HostInfo } from '../src/types/screen.js'
 
 // Ozone выбирается до main.js; поздний appendSwitch смешивает Wayland и X11.
@@ -334,6 +335,7 @@ app
       diagnostics.record('settings-error')
       hostNotice = error instanceof Error ? error.message : 'Не удалось восстановить окна'
     }
+    prepareFetchHeaders(session.defaultSession)
     const fetchNetwork: typeof fetch = (input, init) =>
       net.fetch(input instanceof URL ? input.href : input, init)
     const packages = new PackageStore(join(app.getPath('userData'), 'packages'), {
diff --git a/electron/response-headers.test.ts b/electron/response-headers.test.ts
new file mode 100644
index 0000000..b83601e
--- /dev/null
+++ b/electron/response-headers.test.ts
@@ -0,0 +1,24 @@
+import assert from 'node:assert/strict'
+import { test } from 'node:test'
+import { byteStringResponseHeaders } from './response-headers.js'
+
+test('заголовки с кириллицей совместимы с Headers, обычные значения сохраняются', () => {
+  const original = {
+    'X-Name': ['пример'],
+    Location: ['https://media.test/папка/трек.mp3?name=%D0%B0'],
+    'Content-Disposition': ['attachment; filename="пример.mp3"'],
+    'Content-Length': ['1024'],
+    'Content-Type': ['audio/wav'],
+    'X-Latin': ['caf\u00e9'],
+    'Set-Cookie': ['a=1', 'b=2'],
+  }
+  const result = byteStringResponseHeaders(original)
+  const headers = new Headers(Object.fromEntries(Object.entries(result).map(([name, values]) => [name, values.join(', ')])))
+  assert.equal(headers.get('x-name'), encodeURIComponent('пример'))
+  assert.equal(headers.get('location'), new URL(original.Location[0]!).href)
+  assert.equal(result['Content-Disposition']![0], `attachment; filename="${encodeURIComponent('пример')}.mp3"`)
+  for (const name of ['Content-Length', 'Content-Type', 'X-Latin', 'Set-Cookie'] as const)
+    assert.deepEqual(result[name], original[name])
+  assert.equal(original['X-Name'][0], 'пример')
+  assert.deepEqual(byteStringResponseHeaders(), {})
+})
diff --git a/electron/response-headers.ts b/electron/response-headers.ts
new file mode 100644
index 0000000..e02e0f8
--- /dev/null
+++ b/electron/response-headers.ts
@@ -0,0 +1,13 @@
+export function byteStringResponseHeaders(headers: Record<string, string[]> = {}) {
+  return Object.fromEntries(Object.entries(headers).map(([name, values]) => [
+    name,
+    values.map((value) => value.replace(/[^\x00-\xff]+/gu, encodeURIComponent)),
+  ]))
+}
+
+export function prepareFetchHeaders(target: Electron.Session) {
+  // Electron net.fetch throws outside its promise when a response header contains Unicode.
+  target.webRequest.onHeadersReceived((details, callback) => {
+    callback({ responseHeaders: byteStringResponseHeaders(details.responseHeaders) })
+  })
+}
diff --git a/scripts/network-headers-smoke.cjs b/scripts/network-headers-smoke.cjs
new file mode 100644
index 0000000..929e45c
--- /dev/null
+++ b/scripts/network-headers-smoke.cjs
@@ -0,0 +1,44 @@
+const assert = require('node:assert/strict')
+const { createServer } = require('node:http')
+const { app, net, session } = require('electron')
+const { prepareFetchHeaders } = require('../dist-electron/electron/response-headers.js')
+
+app.whenReady().then(async () => {
+  prepareFetchHeaders(session.defaultSession)
+  const requests = []
+  const server = createServer((request, response) => {
+    requests.push(request.url)
+    const headers = { 'X-Name': Buffer.from('пример').toString('latin1') }
+    if (request.url === '/redirect') {
+      response.writeHead(302, { ...headers, Location: `/${encodeURIComponent('пример')}` })
+      response.end()
+    } else {
+      response.writeHead(200, { ...headers, 'Content-Type': 'text/plain' })
+      response.end('ok')
+    }
+  })
+  try {
+    await new Promise((resolve, reject) => {
+      server.once('error', reject)
+      server.listen(0, '127.0.0.1', resolve)
+    })
+    const url = `http://127.0.0.1:${server.address().port}`
+    const response = await net.fetch(url)
+    assert.equal(response.headers.get('x-name'), encodeURIComponent('пример'))
+    assert.equal(response.headers.get('content-type'), 'text/plain')
+    assert.equal(await response.text(), 'ok')
+    const followed = await net.fetch(`${url}/redirect`)
+    assert.equal(await followed.text(), 'ok')
+    await session.defaultSession.setProxy({ proxyRules: `http=127.0.0.1:${server.address().port}`, proxyBypassRules: '<-loopback>' })
+    const proxied = await net.fetch('http://headers-proxy.invalid/example')
+    assert.equal(await proxied.text(), 'ok')
+    assert.ok(requests.includes('http://headers-proxy.invalid/example'))
+    console.log('SCREEN_NETWORK_HEADERS_PASS')
+    app.exit(0)
+  } catch (error) {
+    console.error(error)
+    app.exit(1)
+  } finally {
+    server.close()
+  }
+})