我有一个非常奇怪的问题...我真的希望有人能回答,因为我不知道在哪里寻求帮助。
我正在用C++编写一个cgi应用程序,由Apache执行并输出HTML代码。由于我的Web主机不支持mod_deflate,所以我从我的C++应用程序中自己压缩HTML输出。
我已经测试了Firefox 2、Firefox 3、Opera 9、Opera 10、Google Chrome、Safari、IE6、IE7、IE8,甚至是wget。它可以与任何浏览器一起使用,除了IE8。
IE8只显示“Internet Explorer无法显示网页”,没有任何信息。我知道这是因为压缩的原因,因为如果我禁用它,它就可以正常工作。
你知道我做错了什么吗?
我使用zlib进行压缩,精确的代码是:
/* Compress it */
int compressed_output_size = content.length() + (content.length() * 0.2) + 16;
char *compressed_output = (char *)Alloc(compressed_output_size);
int compressed_output_length;
Compress(compressed_output, compressed_output_size, (void *)content.c_str(), content.length(), &compressed_output_length);
/* Send the compressed header */
cout << "Content-Encoding: deflate\r\n";
cout << boost::format("Content-Length: %d\r\n") % compressed_output_length;
cgiHeaderContentType("text/html");
cout.write(compressed_output, compressed_output_length);
static void Compress(void *to, size_t to_size, void *from, size_t from_size, int *final_size)
{
int ret;
z_stream stream;
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.opaque = Z_NULL;
if ((ret = deflateInit(&stream, CompressionSpeed)) != Z_OK)
COMPRESSION_ERROR("deflateInit() failed: %d", ret);
stream.next_out = (Bytef *)to;
stream.avail_out = (uInt)to_size;
stream.next_in = (Bytef *)from;
stream.avail_in = (uInt)from_size;
if ((ret = deflate(&stream, Z_NO_FLUSH)) != Z_OK)
COMPRESSION_ERROR("deflate() failed: %d", ret);
if (stream.avail_in != 0)
COMPRESSION_ERROR("stream.avail_in is not 0 (it's %d)", stream.avail_in);
if ((ret = deflate(&stream, Z_FINISH)) != Z_STREAM_END)
COMPRESSION_ERROR("deflate() failed: %d", ret);
if ((ret = deflateEnd(&stream)) != Z_OK)
COMPRESSION_ERROR("deflateEnd() failed: %d", ret);
if (final_size)
*final_size = stream.total_out;
return;
}