Icicle\Http\Driver\Builder\Http1Builder::buildOutgoingRequest PHP Method

    public function buildOutgoingRequest(Request $request, float $timeout = 0, bool $allowPersistent = false) : \Generator
    {
        if (!$request->hasHeader('Connection')) {
            $request = $request->withHeader('Connection', $allowPersistent ? 'keep-alive' : 'close');
        }
        if (!$request->hasHeader('Accept')) {
            $request = $request->withHeader('Accept', '*/*');
        }
        if ($this->compressionEnabled) {
            $request = $request->withHeader('Accept-Encoding', 'gzip, deflate');
        } else {
            $request = $request->withoutHeader('Accept-Encoding');
        }
        return yield from $this->buildOutgoingStream($request, $timeout);
    }