Gzip compression - MDN Web Docs Glossary: Definitions of Web-related terms
gzip is a file format used for file compression and decompression.
...gzip is commonly supported by web servers and modern browsers, meaning that servers can automatically compress files with gzip before sending them, and browsers can uncompress files upon receiving them.
... learn more how to enable compression and gzip for page speed.
... gzip on wikipedia ...

Cross-Origin Resource Sharing (CORS) - HTTP
le the privileges: let's look at what the browser will send to the server in this case, and let's see how the server responds: get /resources/public-data/ http/1.1 host: bar.other user-agent: mozilla/5.0 (macintosh; intel mac os x 10.14; rv:71.0) gecko/20100101 firefox/71.0 accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 accept-language: en-us,en;q=0.5 accept-encoding: gzip,deflate connection: keep-alive origin: https://foo.example the request header of note is origin, which shows that the invocation is coming from https://foo.example.
...the first exchange is the preflight request/response: options /doc http/1.1 host: bar.other user-agent: mozilla/5.0 (macintosh; intel mac os x 10.14; rv:71.0) gecko/20100101 firefox/71.0 accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 accept-language: en-us,en;q=0.5 accept-encoding: gzip,deflate connection: keep-alive origin: http://foo.example access-control-request-method: post access-control-request-headers: x-pingother, content-type http/1.1 204 no content date: mon, 01 dec 2008 01:15:39 gmt server: apache/2 access-control-allow-origin: https://foo.example access-control-allow-methods: post, get, options access-control-allow-headers: x-pingother, content-type access-control...
...: accept-encoding, origin keep-alive: timeout=2, max=100 connection: keep-alive once the preflight request is complete, the real request is sent: post /doc http/1.1 host: bar.other user-agent: mozilla/5.0 (macintosh; intel mac os x 10.14; rv:71.0) gecko/20100101 firefox/71.0 accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 accept-language: en-us,en;q=0.5 accept-encoding: gzip,deflate connection: keep-alive x-pingother: pingpong content-type: text/xml; charset=utf-8 referer: https://foo.example/examples/preflightinvocation.html content-length: 55 origin: https://foo.example pragma: no-cache cache-control: no-cache <person><name>arun</name></person> http/1.1 200 ok date: mon, 01 dec 2008 01:15:40 gmt server: apache/2 access-control-allow-origin: https://foo.example v...
...And 3 more matches

Content-Encoding - HTTP
header type entity header forbidden header name no syntax content-encoding: gzip content-encoding: compress content-encoding: deflate content-encoding: identity content-encoding: br // multiple, in the order in which they were applied content-encoding: gzip, identity content-encoding: deflate, gzip directives gzip a format using the lempel-ziv coding (lz77), with a 32-bit crc.
... this is the original format of the unix gzip program.
... the http/1.1 standard also recommends that the servers supporting this content-encoding should recognize x-gzip as an alias, for compatibility purposes.
...And 3 more matches

Transfer-Encoding - HTTP
header type response header forbidden header name yes syntax transfer-encoding: chunked transfer-encoding: compress transfer-encoding: deflate transfer-encoding: gzip transfer-encoding: identity // several values can be listed, separated by a comma transfer-encoding: gzip, chunked directives chunked data is sent in a series of chunks.
... gzip a format using the lempel-ziv coding (lz77), with a 32-bit crc.
... this is originally the format of the unix gzip program.
... the http/1.1 standard also recommends that the servers supporting this content-encoding should recognize x-gzip as an alias, for compatibility purposes.

Getting started - SVG: Scalable Vector Graphics
due to the potentially massive size svg files can reach when used for some applications (e.g., geographical applications), the svg specification also allows for gzip-compressed svg files.
...unfortunately, it is very problematic to get gzip-compressed svg files to work reliably across all svg capable user agents when served from a microsoft iis server, and firefox cannot load gzip-compressed svg from the local computer.
... avoid gzip-compressed svg except when you are publishing to a webserver that you know will serve it correctly (see below).
...for normal svg files, servers should send the http headers: content-type: image/svg+xml vary: accept-encoding for gzip-compressed svg files, servers should send the http headers: content-type: image/svg+xml content-encoding: gzip vary: accept-encoding you can check that your server is sending the correct http headers with your svg files by using the network monitor panel or a site such as websniffer.cc.

Index - MDN Web Docs Glossary: Definitions of Web-related terms
190 gzip compression glossary, compression, gzip gzip is a file format used for file compression and decompression.
...gzip is commonly supported by web servers and modern browsers, meaning that servers can automatically compress files with gzip before sending them, and browsers can uncompress files upon receiving them.
...examples of lossless compression include gzip, brotli, webp, and png, 258 mime type glossary, webmechanics a mime type (now properly called "media type", but also sometimes "content type") is a string sent along with a file indicating the type of the file (describing the content format, for example, a sound file might be labeled audio/ogg, or an image file image/png).

Client-Server Overview - Learn web development
webdev http/1.1 host: developer.mozilla.org connection: keep-alive pragma: no-cache cache-control: no-cache upgrade-insecure-requests: 1 user-agent: mozilla/5.0 (windows nt 10.0; wow64) applewebkit/537.36 (khtml, like gecko) chrome/52.0.2743.116 safari/537.36 accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 referer: https://developer.mozilla.org/ accept-encoding: gzip, deflate, sdch, br accept-charset: iso-8859-1,utf-8;q=0.7,*;q=0.7 accept-language: en-us,en;q=0.8,es;q=0.6 cookie: sessionid=6ynxs23n521lu21b1t136rhbv7ezngie; csrftoken=zipujsazv6pcgcbjscj1zu6pqzbfmuat; dwf_section_edit=false; dwf_sg_task_completion=false; _gat=1; _ga=ga1.2.1688886003.1471911953; ffo=true the first and second lines contain most of the information we talked about above: the t...
... it can accept gzip compressed information (accept-encoding: gzip).
...in: https://developer.mozilla.org upgrade-insecure-requests: 1 user-agent: mozilla/5.0 (windows nt 10.0; wow64) applewebkit/537.36 (khtml, like gecko) chrome/52.0.2743.116 safari/537.36 content-type: application/x-www-form-urlencoded accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 referer: https://developer.mozilla.org/profiles/hamishwillee/edit accept-encoding: gzip, deflate, br accept-language: en-us,en;q=0.8,es;q=0.6 cookie: sessionid=6ynxs23n521lu21b1t136rhbv7ezngie; _gat=1; csrftoken=zipujsazv6pcgcbjscj1zu6pqzbfmuat; dwf_section_edit=false; dwf_sg_task_completion=false; _ga=ga1.2.1688886003.1471911953; ffo=true csrfmiddlewaretoken=zipujsazv6pcgcbjscj1zu6pqzbfmuat&user-username=hamishwillee&user-fullname=hamish+willee&user-title=&user-organization=&user-...

Configuring servers for Ogg media - HTTP
don't use http compression for media files one common way to reduce the load on a web server is to use gzip or deflate compression when serving to a supporting web browser.
... although it's unlikely, it's possible the browser may advertise that it supports http compression (gzip/deflate) using the accept-encoding: gzip,deflate header when requesting media files.
... another probelm with allowing http compression for media streaming: apache servers don't send the content-length response header if gzip encoding is used.

Web performance resources - Learn web development
compress your resources using gzip, brotli, and zopfli.
...apply compression such as gzip or brotli for these file types.

JavaScript performance - Learn web development
gzipping compresses the file further, and should be used even if you don't minify.
... brotli is similar to gzip, generally outperforming gzip's compression.

DMD
you can pull them like so: adb pull /sdcard/download/memory-reports/dmd-default-20731.json.gz adb pull /sdcard/download/memory-reports/unified-memory-report-default-20731.json.gz processing the output dmd outputs one gzipped json file per process that contains a description of that process's heap.
... you can analyze these files (either gzipped or not) using dmd.py.

Getting SpiderMonkey source code
you can get the spidermonkey source code in gzipped form or directly from the mercurial repository.
... downloading gzipped spidermonkey source code you can download gzipped spidermonkey source code from the following urls: http://ftp.mozilla.org/pub/spidermonkey/releases/ http://ftp.mozilla.org/pub/spidermonkey/prereleases/ here is a command-line example of downloading and unzipping spidermonkey source code version 59.0: mkdir mozilla cd mozilla wget http://ftp.mozilla.org/pub/spidermonkey/prereleases/59/pre1/mozjs-59.0a1.0.tar.bz2 tar xvf mozjs-59.0a1.0.tar.bz2 these commands should work on most platforms including windows, as long as on windows you are using the mozillabuild bash shell.

Network request details - Firefox Developer Tools
"value": "0" }, { "name": "backend-timing", "value": "d=74716 t=1560258099074460" }, { "name": "cache-control", "value": "private, must-revalidate, max-age=0" }, { "name": "content-disposition", "value": "inline; filename=api-result.js" }, { "name": "content-encoding", "value": "gzip" }, { "name": "content-length", "value": "673" }, { "name": "content-type", "value": "text/javascript; charset=utf-8" }, { "name": "date", "value": "tue, 11 jun 2019 13:01:39 gmt" }, { "name": "mediawiki-login-suppressed", "value": "true" }, { "name": "p3p", ...
..."value": "hhvm/3.18.6-dev" }, { "name": "x-search-id", "value": "esvan0r5bnnwscyk2wq09i1im" }, { "name": "x-varnish", "value": "766019457, 417549316" } ] }, "request headers (665 b)": { "headers": [ { "name": "accept", "value": "*/*" }, { "name": "accept-encoding", "value": "gzip, deflate, br" }, { "name": "accept-language", "value": "en-us,en;q=0.5" }, { "name": "connection", "value": "keep-alive" }, { "name": "cookie", "value": "wmf-last-access=11-jun-2019; wmf-last-access-global=11-jun-2019; mwphp7seed=5c9; geoip=us:ny:port_jervis:41.38:-74.67:v4" }, { "name": "dnt",...

Evolution of HTTP - HTTP
a typical flow of requests, all through one single connection is now looking like this: get /docs/glossary/simple_header http/1.1 host: developer.mozilla.org user-agent: mozilla/5.0 (macintosh; intel mac os x 10.9; rv:50.0) gecko/20100101 firefox/50.0 accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 accept-language: en-us,en;q=0.5 accept-encoding: gzip, deflate, br referer: https://developer.mozilla.org/docs/glossary/simple_header 200 ok connection: keep-alive content-encoding: gzip content-type: text/html; charset=utf-8 date: wed, 20 jul 2016 10:55:30 gmt etag: "547fa7e369ef56031dd3bff2ace9fc0832eb251a" keep-alive: timeout=5, max=1000 last-modified: tue, 19 jul 2016 00:59:33 gmt server: apache transfer-encoding: chunked vary: cookie, accept-e...
...ncoding (content) get /static/img/header-background.png http/1.1 host: developer.cdn.mozilla.net user-agent: mozilla/5.0 (macintosh; intel mac os x 10.9; rv:50.0) gecko/20100101 firefox/50.0 accept: */* accept-language: en-us,en;q=0.5 accept-encoding: gzip, deflate, br referer: https://developer.mozilla.org/docs/glossary/simple_header 200 ok age: 9578461 cache-control: public, max-age=315360000 connection: keep-alive content-length: 3077 content-type: image/png date: thu, 31 mar 2016 13:34:46 gmt last-modified: wed, 21 oct 2015 18:27:50 gmt server: apache (image content of 3077 bytes) http/1.1 was first published as rfc 2068 in january 1997.

Compression in HTTP - HTTP
nowadays, only two are relevant: gzip, the most common one, and br the new challenger.
... apache supports compression and uses mod_deflate; for nginx there is ngx_http_gzip_module; for iis, the <httpcompression> element.