如何将mod_deflate首选压缩方法设置为deflate

Question

当请求头Accept-Encoding为gip, deflate时，mod_deflate始终发送gzip数据。

如何告诉mod_deflate优先发送deflate (而不是zlib)而不是gzip

如果不是possible...why，当模块不能收缩时，开发人员会将模块命名为mod_deflate吗？另外，什么是最好的方式，如果有的话，我提交一个bug报告，以便在未来的版本中修复这个问题？

Answer 1

看过source code for mod_deflate之后，我得出的结论是，除了gzip之外，不可能发送任何其他内容。

现在，我不是一个c程序员，我不认为我能够提交任何补丁myself...but从源代码我可以看到有一些事情需要修复(警告，我从来没有写过任何c...so这可能是非常错误的)

/* add this method */
static const char *deflate_set_preferred_method(cmd_parms *cmd, void *dummy,
                                const char *arg1)
{
    deflate_filter_config *c = ap_get_module_config(cmd->server->module_config,
                                                &deflate_module);

    if (arg2 != NULL && (!strcasecmp(arg1, "deflate") || !strcasecmp(arg1, "gzip") || !strcasecmp(arg1, "zlib") ) ) {
        c->preferred_method = apr_pstrdup(cmd->pool, arg1);
    }
    else {
        return apr_psprintf(cmd->pool, "Unknown preferred method type %s", arg1);
    }

    return NULL;
}

/* update some code to define "preferred_method" */


/* 
   Update all code that references the string "gzip" to take 
   into account "deflate", and "zlib" as well.

   This is the part I really have no clue how to do.
   lines: 539, 604, 607, 616, and 624 should be updates

   line 624 could read something like this: */

if( !strcasecmp(preferred_method,"gzip") ){
    /* add immortal gzip header */
    e = apr_bucket_immortal_create(gzip_header, sizeof gzip_header,
                                   f->c->bucket_alloc);
    APR_BRIGADE_INSERT_TAIL(ctx->bb, e);
}
else if( !strcasecmp(preferred_method, "zlib") ){
   /* do something to add the zlib headers here */
}

/* update this method */
static const command_rec deflate_filter_cmds[] = {
    AP_INIT_TAKE12("DeflateFilterNote", deflate_set_note, NULL, RSRC_CONF,
                  "Set a note to report on compression ratio"),
    AP_INIT_TAKE1("DeflateWindowSize", deflate_set_window_size, NULL,
                  RSRC_CONF, "Set the Deflate window size (1-15)"),
    AP_INIT_TAKE1("DeflateBufferSize", deflate_set_buffer_size, NULL, RSRC_CONF,
                  "Set the Deflate Buffer Size"),
    AP_INIT_TAKE1("DeflateMemLevel", deflate_set_memlevel, NULL, RSRC_CONF,
                  "Set the Deflate Memory Level (1-9)"),
    AP_INIT_TAKE1("DeflateCompressionLevel", deflate_set_compressionlevel, NULL, RSRC_CONF,
                  "Set the Deflate Compression Level (1-9)"),
    AP_INIT_TAKE1("DeflatePreferredMethod", deflate_set_preferred_method, NULL, RSRC_CONF,
                  "Set the Preferred Compression Method: deflate, gzip, or zlib (not-recommended)"),
    {NULL}
};