fix: url with variable not work

[hjlarry]

Summary

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fix #12447

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• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[yihong0618]

LGTM

[yihong0618]

do we have other case, the first screen shot in the issue seems do not have variable

[laipz8200]

Thanks!

[hjlarry]

do we have other case, the first screen shot in the issue seems do not have variable

It's easy to reproduce, make a code node's output a url, and a http node use the code node's output.
I only take a debug panel sceenshot.

[yihong0618]

do we have other case, the first screen shot in the issue seems do not have variable

It's easy to reproduce, make a code node's output a url, and a http node use the code node's output. I only take a debug panel sceenshot.

cool very quick debugger!