# Inquiry regarding maximum HTTP header size for RC7630 **URL:** \ **Category:** RC76\ **Created:** [August 10, 2026, 7:21am UTC](https://forum.sierrawireless.com/t/inquiry-regarding-maximum-http-header-size-for-rc7630/35956 "2026-08-10T07:21:36Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![cksung](https://avatars.discourse-cdn.com/v4/letter/c/d2c977/32.png) [@cksung](https://forum.sierrawireless.com/u/cksung)\ **Post date:** [August 10, 2026, 7:21am UTC](https://forum.sierrawireless.com/t/inquiry-regarding-maximum-http-header-size-for-rc7630/35956/1 "2026-08-10T07:21:36Z")
Hello, I am currently using the **RC7630** module and implementing HTTP communication. I need to send an HTTP header that is **479 bytes** in size. Could you please let me know if it is possible to transmit a header of this size using this module? Additionally, could you clarify what the absolute maximum allowable size is for the HTTP header? If there are any specific AT command configurations or workarounds required to handle a 479-byte (or larger) HTTP header, I would appreciate it if you could share them or point me to the relevant documentation. Here are my module details for reference: - **Module:** RC7630 Best Regards, Chikyoung ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [August 10, 2026, 8:01am UTC](https://forum.sierrawireless.com/t/inquiry-regarding-maximum-http-header-size-for-rc7630/35956/2 "2026-08-10T08:01:15Z")
You can try to send the HTTP header by AT+KHTTPHEADER=1 and read it back by at+khttpheader? to verify if it is OK. From my test, there is no problem to send 486 bytes of header. But for a single line inside the HTTP header, its maximum length is 255 bytes. If one of your header line exceeds 255 bytes, it will be split into two lines.