如何设置mod_deflate首选压缩方法进行压缩

Question

当请求标头Accept-Encoding为gip, deflate时，mod_deflate总是发送gzip数据。

我怎样才能告诉mod_deflate首选发送deflate （不是zlib ）而不是gzip ？

如果这不可能...开发人员为什么在无法放气时将模块命名为mod_deflate。 另外，对我而言，提交错误报告以在将来的版本中对此问题进行修复的最佳方法是什么？

Answer 1

在查看了mod_deflate的源代码之后，我得出的结论是，除了gzip之外，其他任何东西都无法发送。

现在，我不是c程序员，我想我自己也无法提交任何补丁……但是从源头上我可以看到有一些问题需要修复（警告，我从未写过任何c ...所以这可能全都是错误的）

/* 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}
};