231 lines
3.6 KiB
Plaintext
231 lines
3.6 KiB
Plaintext
.TH HGET 1
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.SH NAME
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hget, hpost, urlencode \- retrieve, post to a web page corresponding to a url
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.SH SYNOPSIS
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.B hget
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[
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.B -l
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.B -o
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.I file
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] [
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.B -p
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.I body
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.B -P
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] [
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.B -r
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.I header
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] [
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.B -m
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.I method
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] [
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.B -b
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.I baseurl
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]
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.I url
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.PP
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.B hpost
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[
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.B -l
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] [
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.B -g
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.I action
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.B -p
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.I action
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.B -m
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.I action
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] [
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.B -u
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]
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.I url
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[
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.I name:value
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.I name@file
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]
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.I ...
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.PP
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.B urlencode
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[
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.B -d
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] [
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.I file
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]
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.SH DESCRIPTION
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.I Hget
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retrieves the web page specified by the URL
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.I url
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and writes it, absent the
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.B -l
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and
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.B -o
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options, to standard output.
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.PP
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The
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.I url
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can be a relative path like
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.B ../index.html
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if a absolute
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.I baseurl
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was specified with the
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.B -b
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option.
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.PP
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If
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.I url
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is of type HTTP and the
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.B -p
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or
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.B -P
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options are specified, then a HTTP POST is performed.
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With
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.B -p
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the data to be posted is provided by the
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.I body
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argument as a string or alternatively with
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.B -P
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read from standard input.
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.PP
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The
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.B -l
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option causes
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.I hget
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and
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.I hpost
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to print the location URL from the transactoin response
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instead of retriving the the body data. This is usefull
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for HTTP POST transactions that redirect to a URL containing
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the prosted data so we wont refetch the data we just uploaded
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to the site.
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.PP
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The
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.B -o
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option is used to keep a local file in sync with a
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web page. If the web page has been modified later than the
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file, it is copied into the file. If the file is up to date
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but incomplete,
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.I hget
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will fetch the missing bytes.
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.PP
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Option
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.B -r
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sends an arbitrary HTTP
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.IR header .
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.PP
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Option
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.B -m
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overrides the HTTP method used for the request.
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.PP
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.I Hpost
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retrieves the web page specified by the URL
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.I url,
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parses its HTML for form data, then prints
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.IR rc (1)
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commands to submit the forms with default field
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values.
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If an
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.I action
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URL is provided with the
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.B -g, -p
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or
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.B -m
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flags, then
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.I hget
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is invoked to execute the transaction submitting the form data.
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.PP
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The
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.B -g
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and
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.B -p
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flags set the form method to GET and POST, respectively. The
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.B -m
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flag sets the form method to POST and its enctype to
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.B multipart/form-data.
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In all cases, the target relative form action URL is set to
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.I action.
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.PP
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The
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.B -u
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flag sets the target URL to
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.I url.
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As the
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.I url
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parameter is always required, the
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.B -u
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flag can be omited when
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.I url
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follows directly after the last option if any.
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.PP
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The remaining arguments of the form
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.B name:value
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are interpreted as text form field names and values to be submitted. An
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argument of the form
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.B name@file
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is interpreted as a file upload, with the information following the
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.B @
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symbol treated as the file name.
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For
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.B multipart/form-data
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uploads (see
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.B -m
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flag), the file has to be seekable as
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.IR file (1)
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is invoked to determine its mime type.
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.PP
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.I Urlencode
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is a helper program to URL encode and decode files. The
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.B -d
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flag, instead of encode, decodes URL encoded file. If no
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.I file
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is given, standard input is read. The resulting data
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is written to standard output.
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.SH EXAMPLES
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Download a file from the web.
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.IP
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.EX
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% hget http://9front.org/img/nix-on.jpg >/tmp/nix-on.jpg
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.EE
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.PP
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Retrieve the commands needed to submit a form, which may then be
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edited and sent.
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.IP
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.EX
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% hpost http://p.intma.in
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/bin/hpost -u http://p.intma.in -p paste.cgi text:
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.EE
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.PP
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Manually specify fields to be sent to a given
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.I url.
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.IP
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.EX
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% hpost -u http://p.intma.in -p paste.cgi text:'test post'
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.EE
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.PP
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Upload a file, print the resulting URL
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.IP
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.EX
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% hpost -l http://i.intma.in file@/tmp/screen.png | rc
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.EE
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.SH SOURCE
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.B /rc/bin/hget
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.br
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.B /rc/bin/hpost
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.br
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.B /sys/src/cmd/urlencode.c
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.SH "SEE ALSO"
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.IR webfs (4),
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.IR ftpfs (4),
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.IR file (1)
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.SH DIAGNOSTICS
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.I Hget
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and
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.I hpost
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require
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.IR webfs (4)
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service mounted on
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.B /mnt/web
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to work.
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