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download-gated-pdfs

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Mis à jour22 juillet 2026 à 09:34

Download the actual PDF binary from bot-gated sites (taxpolicycenter.org, urban.org, SSRN-hosted mirrors, think-tank/publisher sites) via the Wayback Machine id_ URL form. Use when: (1) curl/WebFetch of a .pdf URL returns HTML instead of a PDF even with a browser User-Agent, (2) pypdf fails with "invalid pdf header: b'<!DOC'" or "EOF marker not found" on a freshly downloaded file, (3) Firecrawl can parse the PDF to markdown but you need the original file on disk (e.g., filing a reference copy).

Installation

Installer avec Codex ou Claude Copiez ce prompt, collez-le dans Codex, Claude ou un autre assistant, puis laissez-le vérifier la page du skill et l'installer pour vous.

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kennethkhoocy

kennethkhoocy/applied-micro-skills

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Métiers associésSOC

Basé sur la classification professionnelle SOC

Développeurs de logicielsProfessions informatiques et mathématiques·SOC 15-1252

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2 fichiers

SKILL.md

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name	download-gated-pdfs
description	Download the actual PDF binary from bot-gated sites (taxpolicycenter.org, urban.org, SSRN-hosted mirrors, think-tank/publisher sites) via the Wayback Machine id_ URL form. Use when: (1) curl/WebFetch of a .pdf URL returns HTML instead of a PDF even with a browser User-Agent, (2) pypdf fails with "invalid pdf header: b'<!DOC'" or "EOF marker not found" on a freshly downloaded file, (3) Firecrawl can parse the PDF to markdown but you need the original file on disk (e.g., filing a reference copy).
author	Claude Code
version	1.0.0
date	"2026-07-15T00:00:00.000Z"

Download bot-gated PDFs via Wayback id_

Problem

Many think-tank and publisher sites (taxpolicycenter.org, urban.org, SSRN delivery) serve an HTML bot-challenge page instead of the PDF to non-browser clients. A browser User-Agent header does not help. The downloaded "PDF" is actually HTML.

Context / Trigger Conditions

curl -o file.pdf <url> succeeds but the file starts with <!DOC
pypdf raises invalid pdf header: b'<!DOC' or PdfStreamError: Stream has ended unexpectedly
Firecrawl scrape returns clean markdown for the same URL (its proxies get through), but Firecrawl does not return the binary — only parsed content

Solution

Request the file through the Wayback Machine's raw-content (id_) endpoint, which serves the original archived binary without rewriting:
```
curl -sL -A "Mozilla/5.0 ... Chrome/126.0 Safari/537.36" \
  "https://web.archive.org/web/<YYYY>id_/<original-pdf-url>" -o out.pdf
```
<YYYY> is any year likely to have a snapshot (e.g. publication year); Wayback redirects to the nearest capture. The id_ suffix after the timestamp is what requests the untouched original.

Verify the download with pypdf — a bot page fails immediately:

from pypdf import PdfReader
r = PdfReader("out.pdf"); print(len(r.pages), "pages")

If Wayback has no capture, fall back to: another mirror found via search (Exa/Firecrawl), or Firecrawl scrape for the parsed text when the binary is not strictly needed.

Verification

PdfReader opens the file and reports a plausible page count; first-page text matches the expected title.

Example

Verified 2026-07-15: taxpolicycenter.org/sites/default/files/publication/165884/ssrn-id4797771.pdf and urban.org/sites/default/files/publication/80621/2000790-...pdf both bot-gated to direct curl (with UA), both downloaded intact via https://web.archive.org/web/2024id_/<url> and .../web/2023id_/<url> (18 and 12 pages).

Notes

Government data hosts (e.g. ticdata.treasury.gov) are usually NOT gated — try direct curl first; Wayback is the fallback, not the default.
Wayback captures can be stale for frequently-revised documents; check the snapshot date if currency matters.
See also: the pdf skill (parsing/extraction after download) and firecrawl:firecrawl-scrape (parsed markdown when the binary is unnecessary).

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name	download-gated-pdfs
description	Download the actual PDF binary from bot-gated sites (taxpolicycenter.org, urban.org, SSRN-hosted mirrors, think-tank/publisher sites) via the Wayback Machine id_ URL form. Use when: (1) curl/WebFetch of a .pdf URL returns HTML instead of a PDF even with a browser User-Agent, (2) pypdf fails with "invalid pdf header: b'<!DOC'" or "EOF marker not found" on a freshly downloaded file, (3) Firecrawl can parse the PDF to markdown but you need the original file on disk (e.g., filing a reference copy).
author	Claude Code
version	1.0.0
date	"2026-07-15T00:00:00.000Z"

Download bot-gated PDFs via Wayback id_

Problem

Context / Trigger Conditions

curl -o file.pdf <url> succeeds but the file starts with <!DOC
pypdf raises invalid pdf header: b'<!DOC' or PdfStreamError: Stream has ended unexpectedly
Firecrawl scrape returns clean markdown for the same URL (its proxies get through), but Firecrawl does not return the binary — only parsed content

Solution

Request the file through the Wayback Machine's raw-content (id_) endpoint, which serves the original archived binary without rewriting:
```
curl -sL -A "Mozilla/5.0 ... Chrome/126.0 Safari/537.36" \
  "https://web.archive.org/web/<YYYY>id_/<original-pdf-url>" -o out.pdf
```
<YYYY> is any year likely to have a snapshot (e.g. publication year); Wayback redirects to the nearest capture. The id_ suffix after the timestamp is what requests the untouched original.

Verify the download with pypdf — a bot page fails immediately:

from pypdf import PdfReader
r = PdfReader("out.pdf"); print(len(r.pages), "pages")

If Wayback has no capture, fall back to: another mirror found via search (Exa/Firecrawl), or Firecrawl scrape for the parsed text when the binary is not strictly needed.

Verification

PdfReader opens the file and reports a plausible page count; first-page text matches the expected title.

Example

Notes

Government data hosts (e.g. ticdata.treasury.gov) are usually NOT gated — try direct curl first; Wayback is the fallback, not the default.
Wayback captures can be stale for frequently-revised documents; check the snapshot date if currency matters.
See also: the pdf skill (parsing/extraction after download) and firecrawl:firecrawl-scrape (parsed markdown when the binary is unnecessary).