Querying N++'s server

Sample queries:

/prod/steam/query_levels?app_id=230270&steam_id=76561198025195712&user_id=162041&steam_auth=&qt=7&mode=0&page=0&player_id=0
/prod/steam/search/levels?app_id=230270&steam_id=76561198025195712&user_id=162041&steam_auth=&search=enr&mode=0&page=0&player_id=0

My own query:

https://dojo.nplusplus.ninja/prod/steam/query_levels?steam_id=76561198031272062&steam_auth=&qt=7&mode=0&page=0

\\ --- Queries ---

+---------------+------------------------------------------------------------+
|    NAME       |                      DESCRIPTION                           |
+---------------+------------------------------------------------------------+
| get_scores    | Returns leaderboard data for a specific level.             |
| get_replay    | Returns replay data for a specific run.                    |
| query_levels  | Returns a list of userlevels from a specific tab and page. |
| search/levels | Returns a list of userlevel results for a specific search. |
+---------------+------------------------------------------------------------+

\\ --- Parameters ---

Not all parameters are valid for all queries, or mean the same in that case.

+---------------+-------------------------------------------------------------------------------+
|    NAME       |                                        DESCRIPTION                            |
+---------------+-------------------------------------------------------------------------------+
| app_id        |                                                                               |
| steam_id      | Obligatory. Must contain the SteamID64 of an active N++ player.               |
| steam_auth    | Obligatory. Can be left empty.                                                |
| user_id       |                                                                               |
| level_id      |                                                                               |
| replay_id     |                                                                               |
| player_id     |                                                                               |
| qt            | Query type. Specifies the leaderboard (get_scores) or the tab (query_levels). |
| mode          | Specifies the playing mode (solo, coop, race).                                |
| page          | Specifies the page of results of the query                                    |
+---------------+-------------------------------------------------------------------------------+

\\ --- Page ---

* This controls what page of results from the specified category to show.
* It goes in decreasing chronological order.
* It's limited to 500 maps per page.
* This way, all maps could be queried.
* If there's a single page, changing this number doesn't do anything, but if there're more pages, surpassing the limit will return an empty page.

\\ --- Modes ---

0 Solo
1 Coop
2 Race

\\ --- Categories (qt) ---

Default value: 0 (which doesn't exist).

--- Before this, none exist ---
07 Best
08 Featured
09 Top Weekly
10 Newest
11 Hardest
12 Made by me, sorted by ++'s (verify)
13 Made by me, sorted by Date (verify)
14 Favourited, sorted by Date (verify)
15 Favourited, sorted by ++'s (verify)
16 ?
17 --- DOESN'T EXIST ---
18 Made by friends, sorted by Date
19 Made by friends, sorted by ++'s
20 --- DOESN'T EXIST ---
21 Favourited by friends
22 Tracked by friends, sorted by Date
23 Tracked by friends, sorted by Rank
24 Tracked by friends, sorted by Rank, with    Score
25 Tracked by friends, sorted by Rank, without Score
26 Tracked by me
27 --- DOESN'T EXIST ---
28 --- DOESN'T EXIST ---
29 --- DOESN'T EXIST ---
30 Following, sorted by Date
31 Following, sorted by ++'s
--- Repetitions? ---
32 Made by me, sorted by ++'s
33 Made by me, sorted by Date
34 ?
35 Tracked by me
--- After this, none seem to exist---


\\ --- Format of data ---

File = Header (32 bytes) + Map Headers (n * 44 bytes) + Map Data Blocks.

Notes:
* n is the number of maps.
* There is one map data block for each map header.
* Each query, and thus page, seems to be limited at 500 results.
* All 4 byte integers are little endian.
* For unknown fields, possible values are in parenthesis.

+---------------------------+
|     HEADER (48 bytes)     |
+---------------------------+
| # of bytes - Description  |
+---------------------------+
| 16 - Date of update       |
| 04 - Nº of maps           |
| 04 - Page                 |
| 04 - ? (0)                |
| 04 - Category             |
| 04 - Mode                 |
| 04 - ? (1200, once 5)     |
| 04 - ? (500, once 25)     |
| 04 - ? (0, once 5)        |
+---------------------------+
|   MAP HEADER (44 bytes)   |
+---------------------------+
| # of bytes - Description  |
+---------------------------+
| 04 - Map ID               |
| 04 - User ID              |
| 16 - Author name (padded) |
| 04 - Number of ++'s       |
| 16 - Date                 |
+---------------------------+
|         MAP DATA          |
+---------------------------+
| # of bytes - Description  |
+---------------------------+
| 04 - Size of block        |
| 02 - ?                    | (maybe some integrity check, or some object count)
| ## - zlib-compressed data |
+---------------------------+