Doubts about web page paths_html/css_WEB-ITnose

There is such a href in the html code of tieba.baidu.com
http://tb1.bdstatic.com/??tb/static-common/style/tb_ui_484b2a0.css,tb/static-common/ style/tb_common_deca640.css"
How should I understand the ??tb here? Isn’t it true that the file name cannot contain question marks?

It is also tieba.baidu.com, and there is a
href ="http://tb1.bdstatic.com/??/tb/_/card_50e3a0c.css,/tb/_/flash_lcs_54b592f.css,/tb/_/new_message_system_7d56771.css,/tb/_/userbar_cd415fb.css, /tb/_/poptip_f0fdc70.css,/tb/_/new_2_index_61f65e7.css,/tb/_/suggestion_1060c9a.css,/tb/_/search_bright_b4b1908.css,/tb/_/slide_show_aad29db.css,/tb/_/ carousel_area_v2_e8870da.css,/tb/_/interest_num_v2_9e1e75a.css,/tb/_/shake_bear_1c76f32.css,/tb/_/left_floatlayer_0eb022c.css,/tb/_/ten_years_6aadb4f.css,/tb/_/card_ ba3865b.css,/ tb/_/js_pager_5be1e39.css,/tb/_/wallet_dialog_bbc5ccb.css,/tb/_/icons_f439ff0.css,/tb/_/tdou_cdb24f5.css,/tb/_/tcharge_dialog_d41d8cd.css,/tb/_/like_tip_d 5bf924 .css,/tb/_/icons_9fe1e32.css,/tb/_/member_api_b0a7606.css,/tb/_/tb_region_a83e55d.css,/tb/_/nameplate_1dd44c0.css,/tb/_/dialog_6ed86bb.css,/tb /_/join_vip_dialog_d72e4ed.css,/tb/_/cont_sign_card_1b553b8.css,/tb/_/sign_tip_0719cee.css,/tb/_/sign_mod_bright_e3d1c32.css"
How can I understand it if it is separated by commas? I have only seen a single The href of the address

I’m not very familiar with this area and I need some programming advice. I’d like some advice from experts

Reply to the discussion (solution)

The file name cannot contain question marks
but this is a url (the same resource location). The question mark indicates the beginning of the parameter

The file name cannot contain a question mark
but this is a url (Same resource positioning) is ok, the question mark indicates the beginning of the parameter

So what is the actual path of the css file in the first link?

He analyzed the CGI environment Variable QUERY_STRING
actually requires css
http://tb1.bdstatic.com/tb/static-common/style/tb_ui_484b2a0.css
http://tb1.bdstatic.com/tb/ The merged file of static-common/style/tb_common_deca640.css

By analyzing the CGI environment variable QUERY_STRING
, the css is actually
http://tb1.bdstatic .com/tb/static-common/style/tb_ui_484b2a0.css
http://tb1.bdstatic.com/tb/static-common/style/tb_common_deca640.css
Merged file

Do you mean that the super long href at the end points to the merge of N CSS files separated by commas?