`resume.cfg` may be written before the tool fully validates or flushes the current processing

[ayuxsec]

httpx version:

v1.7.4 (latest)

Current Behavior:

After interrupting httpx with CTRL+C, resuming with r resume.cfg does resume execution, but some URLs that were not fully processed before interruption are skipped. The resumed run does not reprocess all remaining targets, resulting in missing output compared to normal run.

Expected Behavior:

Running httpx -r resume.cfg should resume processing the remaining targets from the resume file and produce output accordingly.

---

Steps To Reproduce:

1. Run httpx with input from stdin:

   cat subs.txt | httpx

2. Interrupt execution using CTRL+C after partial output.

3. Observe that resume.cfg is created.

4. Attempt to resume execution:

   cat subs.txt | httpx -r resume.cfg

5. Observer that some targets are not present compared to the output in normal run

Anything else:

Full terminal output:

ayux@pop-os:/tmp$ cat subs.txt | httpx

    __    __  __       _  __
   / /_  / /_/ /_____ | |/ /
  / __ \/ __/ __/ __ \|   /
 / / / / /_/ /_/ /_/ /   |
/_/ /_/\__/\__/ .___/_/|_|
             /_/

        projectdiscovery.io

[INF] Current httpx version v1.7.4 (latest)
[WRN] UI Dashboard is disabled, Use -dashboard option to enable
https://example.com
https://test.io
https://google.com
https://youtube.com
ayux@pop-os:/tmp$ cat subs.txt | httpx

    __    __  __       _  __
   / /_  / /_/ /_____ | |/ /
  / __ \/ __/ __/ __ \|   /
 / / / / /_/ /_/ /_/ /   |
/_/ /_/\__/\__/ .___/_/|_|
             /_/

        projectdiscovery.io

[INF] Current httpx version v1.7.4 (latest)
[WRN] UI Dashboard is disabled, Use -dashboard option to enable
https://example.com
https://test.io
^C[INF] CTRL+C pressed: Exiting
[INF] Creating resume file: resume.cfg
[ble: exit 1]
ayux@pop-os:/tmp$ cat subs.txt | httpx -r resume.cfg

    __    __  __       _  __
   / /_  / /_/ /_____ | |/ /
  / __ \/ __/ __/ __ \|   /
 / / / / /_/ /_/ /_/ /   |
/_/ /_/\__/\__/ .___/_/|_|
             /_/

        projectdiscovery.io

[INF] Current httpx version v1.7.4 (latest)
[WRN] UI Dashboard is disabled, Use -dashboard option to enable

Possible Cause (Speculation):

It appears that resume.cfg may be written before the tool fully validates or flushes the current processing state (including remaining targets and/or output state). As a result, the resume file may be incomplete or inconsistent, causing httpx -r resume.cfg to start without any remaining work to process.

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[ayuxsec]

From my additional tests it seems that even the resume logic is broken apart from incorrectly writing wrong index & input in resume.cfg file (mb the flag for resume is -resume not -r)

ayux@pop-os:~$ cat subs.txt 
example.com
test.com
facebook.com
hackerone.com
google.com

ayux@pop-os:~$ cat resume.cfg 
resume_from=test.com
index=5
ayux@pop-os:~$ sed -i 's/index=.*/index=2/' resume.cfg
ayux@pop-os:~$ cat resume.cfg 
resume_from=test.com
index=2
ayux@pop-os:~$ httpx -l subs.txt -r resume.cfg -v

    __    __  __       _  __
   / /_  / /_/ /_____ | |/ /
  / __ \/ __/ __/ __ \|   /
 / / / / /_/ /_/ /_/ /   |
/_/ /_/\__/\__/ .___/_/|_|
             /_/

		projectdiscovery.io

[INF] Current httpx version v1.7.4 (latest)
[DBG] Using resolvers: resume_from=test.com,index=2
[WRN] UI Dashboard is disabled, Use -dashboard option to enable
[DBG] Failed 'http://test.com': Get "http://test.com": cause="no address found for host"
[DBG] Failed 'http://google.com': Get "http://google.com": cause="no address found for host"
[DBG] Failed 'http://facebook.com': Get "http://facebook.com": cause="no address found for host"
[DBG] Failed 'http://example.com': Get "http://example.com": cause="no address found for host"
[DBG] Failed

[dogancanbakir]

/bounty $75

[algora-pbc]

💎 $75 bounty • ProjectDiscovery Bounty Available

How to Participate:

• Claim attempt: Comment /attempt #2345 on this issue. Multiple participants can attempt, but only the first to submit a complete, mergeable solution will receive the reward.
• Work on the issue: Follow the Contribution Guidelines and ensure your solution fully addresses the issue requirements.
• Submit your PR: Open a pull request to projectdiscovery/httpx and include /claim #2345 in the PR body.
• Receive payment: Upon successful merge, you will receive 100% of the bounty through Algora within 2-5 days.

Thank you for contributing to projectdiscovery/httpx and helping us democratize security!

---

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Describe the overall picture of your modifications to help maintainers understand the pull request.

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Checklist

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• All checks passed (lint, unit/integration/regression tests)
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• Documentation added (if appropriate)

---

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Attempt	Started (UTC)	Solution	Actions
🟢 @erdogan98	Feb 02, 2026, 05:32:35 PM	#2388	Reward
🟢 @Simplereally	Feb 02, 2026, 11:31:26 PM	#2390	Reward
🟢 @assakafpix	Feb 04, 2026, 09:28:39 PM	#2393	Reward
🟢 @ohmygod20260203	Feb 05, 2026, 05:47:08 PM	#2394	Reward
🟢 @thecafetron-ctrl	Feb 08, 2026, 11:59:53 AM	WIP

[Simplereally]

/attempt #2345

[erdogan98]

/attempt #2345