cannot create key-value in "code" mode for version 1.21.4

[shantanugadgil]

Reproduction Steps

• download the latest version 1.21.4
• unzip the file
• run in dev mode consul agent -dev
• browse to 127.0.0.1:8500 and try to create a key value

All I get is the spinner continuously rotating as can be seen in the screen shot:

Also on the console, I see the following (probably related):

2025-08-14T00:59:52.409+0530 [DEBUG] agent: warning: request content-type is not supported: request-path="/v1/kv/?keys&dc=dc1&separator=%2F"
2025-08-14T00:59:52.409+0530 [DEBUG] agent: warning: response content-type header not explicitly set.: request-path="/v1/kv/?keys&dc=dc1&separator=%2F"
2025-08-14T00:59:54.116+0530 [DEBUG] agent: warning: request content-type is not supported: request-path="/ui/dc1/kv/%7B%7B.ContentPath%7D%7Dassets/chunk.504.6916aef248f167c7ce2b.js"
2025-08-14T00:59:54.116+0530 [DEBUG] agent: warning: response content-type header not explicitly set.: request-path="/ui/dc1/kv/%7B%7B.ContentPath%7D%7Dassets/chunk.504.6916aef248f167c7ce2b.js"
2025-08-14T01:00:03.741+0530 [DEBUG] agent: warning: request content-type is not supported: request-path="/ui/dc1/kv/%7B%7B.ContentPath%7D%7Dassets/chunk.504.6916aef248f167c7ce2b.js"
2025-08-14T01:00:03.741+0530 [DEBUG] agent: warning: response content-type header not explicitly set.: request-path="/ui/dc1/kv/%7B%7B.ContentPath%7D%7Dassets/chunk.504.6916aef248f167c7ce2b.js"

NOTE: If I switch off "code" mode, I can create the key-value

Consul Version

1.21.4 in dev mode (consul agent -dev)

Consul v1.21.4
Revision 59b8b905
Build Date 2025-08-13T12:03:12Z
Protocol 2 spoken by default, understands 2 to 3 (agent will automatically use protocol >2 when speaking to compatible agents)

Browser and Operating system details

Mozilla Firefox on Linux
Vivaldi on Linux

[argtrak]

I encounter the same issue. I see the same behavior in kv editor, and policy editor (maybe others as well).
Rendering stays stuck with spinning circle. I tried brave and edge, same thing.
Reverting to 1.21.3 gets the editor back functional.

[shantanugadgil]

are we the only ones seeing this? tagging a few folks 😇

@mkeeler @slackpad @dnephin @johncowen

EDIT: after following the changelog and the PR:

@suresh-hashicorp @sreeram77 @mohit-hashicorp

[sreeram77]

Thanks for raising this. I'll look into this.

[suresh-hashicorp]

Opened a PR to fix this issue.

[dearcode2018]

i have the same problem

[unixzen]

i have the same problem too, when we can wait fix resolve?

[shantanugadgil]

any news on the update? will there be a 1.21.5 to fix this?

[blight19]

same problem
it seems that ContentPath%7D%7Dassets/chunk.504.6916aef248f167c7ce2b.js can't been loaded