GET zlib.net HTTP 200116 ms16.0 KB$0.000061 captured Aug 7, 2026
zlib.net, as data
One API turns any zlib.net page into markdown, structured JSON, its link graph or a screenshot, and crawls the whole site the same way. The panel shows the real response we captured.
- Render mode
- Plain HTTP, no browser needed
- Response
- HTTP 200 in 116 ms
- Page size
- 16.0 KB of markdown, 332 lines
- Fields
- Business Name, Address, Phone, Category and 2 more
- Captured
- Aug 7, 2026
Free balance on signup, no card. This zlib.net page cost $0.000061 to fetch.
A Massively Spiffy Yet Delicately Unobtrusive Compression Library![[DDJ's zlib image]](images/zlib_ddj.png)general-purpose, legally unencumbered -- that is, not covered by any patents-- lossless data-compression library for use on virtually any computer hardwareand operating system. The zlib data format is itself portable acrossplatforms. Unlike the LZW compression method used in Unix *compress*(1)and in the GIF image format, the compression method currently used in zlibessentially never expands the data. (LZW can double or triple the file size inextreme cases.) zlib's memory footprint is also independent of the input dataand can be reduced, if necessary, at some cost in compression. A more precise,technical discussion of both points is available on [(decompression). Jean-loup is also the primary author of*gzip*(1), the author of the comp.compression FAQ list andInfo-ZIP](http://www.info-zip.org/pub/infozip/)'s Zip;Mark is also the author of gzip's anddecompression routines and was the original author of Zip. Not surprisingly,the compression algorithm used in zlib is essentially the same as that ingzip and Zip, namely, the `deflate' method that originated inMark can be reached via e-mail atthe **manual** before asking for help.Nearly all of the questions we get already have ananswer in the *zlib* documentation. Questions on the usage of zlib arebest answered on Stack Overflow.zlib development contributions and issues are best addressed onThe deflate and zlib specifications both achieved official Internet RFC status in May 1996,and zlib itself was adopted in version 1.1 of the Java Development Kit (JDK), both as araw class](https://docs.oracle.com/javase/8/docs/api/java/util/zip/package-summary.html) and as a component of the [JAR archiveformat](https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jarGuide.html).The lovely zlib-vise image above was provided courtesy of Bruce Gardner, artdirector of Dr. Dobb's Journal. ItWhat Spider does on zlib.net
Same key, five endpoints. The numbers under a cell were measured on this page.
Page to markdown
Clean text for RAG and LLM context, boilerplate removed. The lane that runs without a key.
116 ms · $0.000061Page to JSON
Spider reads the page and names the fields. Pass your own schema when you need exact keys.
Rendered capture
Real Chromium, full-page PNG. The same call also returns the rendered HTML.
The call behind the panel
This request produced the response above. Paste it with your key and you get the same bytes.
curl -X POST https://api.spider.cloud/scrape \
-H "Authorization: Bearer $SPIDER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"url": "https://zlib.net/", "return_format": "markdown"}'from spider import Spider
app = Spider()
params = {"return_format": "markdown"}
page = app.scrape_url("https://zlib.net/", params=params)
print(page[0]["content"])import { Spider } from "@spider-cloud/spider-client";
const app = new Spider();
const [page] = await app.scrapeUrl("https://zlib.net/", {
return_format: "markdown",
});
console.log(page.content);What zlib.net costs
Multiplied from the measured 16.0 KB page. Estimates round to the cent.
1 GB of transfer costs $1, plus $0.001 per CPU minute, and failed requests cost $0. Crawling daily? The Unlimited plan is a flat monthly rate.
Point this at the rest of zlib.net.
The capture above took 116 ms and cost $0.000061. The same call takes any URL on zlib.net.