Upload multiple pictures and text messages on the page, and set Content-Tyep to text/plain. How does the back end receive this data?

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The

front end uploads data through ajax without using a form.

the front-end page uploads multiple pictures and text messages, and sets content-type to text/plain. How does the backend receive the data in this way? Normal multi-part display should not be set to Multipart/form-data?

Mar.14,2021

the backend accepts body data directly:
if it is JAVA, it is:

$body = file_get_contents("php://input");
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b38043-2c0bf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b38043-2c0bf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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