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.TH "NGHTTP" "1" "Oct 25, 2025" "1.68.0" "nghttp2"
.SH NAME
nghttp \- HTTP/2 client
.SH SYNOPSIS
.sp
\fBnghttp\fP [OPTIONS]... <URI>...
.SH DESCRIPTION
.sp
HTTP/2 client
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.TP
.B <URI>
Specify URI to access.
.UNINDENT
.SH OPTIONS
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.TP
.B \-v, \-\-verbose
Print   debug   information   such  as   reception   and
transmission of frames and name/value pairs.  Specifying
this option multiple times increases verbosity.
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.TP
.B \-n, \-\-null\-out
Discard downloaded data.
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.TP
.B \-O, \-\-remote\-name
Save  download  data  in  the  current  directory.   The
filename is  derived from  URI.  If  URI ends  with \(aq\fI/\fP\(aq,
\(aqindex.html\(aq  is used  as a  filename.  Not  implemented
yet.
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.TP
.B \-t, \-\-timeout=<DURATION>
Timeout each request after <DURATION>.  Set 0 to disable
timeout.
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.TP
.B \-w, \-\-window\-bits=<N>
Sets the stream level initial window size to 2**<N>\-1.
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.TP
.B \-W, \-\-connection\-window\-bits=<N>
Sets  the  connection  level   initial  window  size  to
2**<N>\-1.
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.TP
.B \-a, \-\-get\-assets
Download assets  such as stylesheets, images  and script
files linked  from the downloaded resource.   Only links
whose  origins are  the same  with the  linking resource
will be downloaded.   nghttp prioritizes resources using
HTTP/2 dependency  based priority.  The  priority order,
from highest to lowest,  is html itself, css, javascript
and images.
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.TP
.B \-s, \-\-stat
Print statistics.
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.TP
.B \-H, \-\-header=<HEADER>
Add a header to the requests.  Example: \fI\%\-H\fP\(aq:method: PUT\(aq
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.TP
.B \-\-trailer=<HEADER>
Add a trailer header to the requests.  <HEADER> must not
include pseudo header field  (header field name starting
with \(aq:\(aq).  To  send trailer, one must use  \fI\%\-d\fP option to
send request body.  Example: \fI\%\-\-trailer\fP \(aqfoo: bar\(aq.
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.TP
.B \-\-cert=<CERT>
Use  the specified  client certificate  file.  The  file
must be in PEM format.
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.TP
.B \-\-key=<KEY>
Use the  client private key  file.  The file must  be in
PEM format.
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.TP
.B \-d, \-\-data=<PATH>
Post FILE to server. If \(aq\-\(aq  is given, data will be read
from stdin.
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.TP
.B \-m, \-\-multiply=<N>
Request each URI <N> times.  By default, same URI is not
requested twice.  This option disables it too.
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.TP
.B \-u, \-\-upgrade
Perform HTTP Upgrade for HTTP/2.  This option is ignored
if the request URI has https scheme.  If \fI\%\-d\fP is used, the
HTTP upgrade request is performed with OPTIONS method.
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.TP
.B \-\-extpri=<PRI>
Sets RFC 9218 priority of  given URI.  <PRI> must be the
wire format  of priority  header field  (e.g., \(dqu=3,i\(dq).
This  option  can  be  used  multiple  times,  and  N\-th
\fI\%\-\-extpri\fP option sets priority of N\-th URI in the command
line.  If  the number  of this option  is less  than the
number of  URI, the last  option value is  repeated.  If
there  is   no  \fI\%\-\-extpri\fP  option,  urgency   is  3,  and
incremental is false.
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.TP
.B \-M, \-\-peer\-max\-concurrent\-streams=<N>
Use  <N>  as  SETTINGS_MAX_CONCURRENT_STREAMS  value  of
remote endpoint as if it  is received in SETTINGS frame.
.sp
Default: \fB100\fP
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.TP
.B \-c, \-\-header\-table\-size=<SIZE>
Specify decoder  header table  size.  If this  option is
used  multiple times,  and the  minimum value  among the
given values except  for last one is  strictly less than
the last  value, that minimum  value is set  in SETTINGS
frame  payload  before  the   last  value,  to  simulate
multiple header table size change.
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.TP
.B \-\-encoder\-header\-table\-size=<SIZE>
Specify encoder header table size.  The decoder (server)
specifies  the maximum  dynamic table  size it  accepts.
Then the negotiated dynamic table size is the minimum of
this option value and the value which server specified.
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.TP
.B \-b, \-\-padding=<N>
Add at  most <N>  bytes to a  frame payload  as padding.
Specify 0 to disable padding.
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.TP
.B \-r, \-\-har=<PATH>
Output HTTP  transactions <PATH> in HAR  format.  If \(aq\-\(aq
is given, data is written to stdout.
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.TP
.B \-\-color
Force colored log output.
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.TP
.B \-\-continuation
Send large header to test CONTINUATION.
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.TP
.B \-\-no\-content\-length
Don\(aqt send content\-length header field.
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.TP
.B \-\-hexdump
Display the  incoming traffic in  hexadecimal (Canonical
hex+ASCII display).  If SSL/TLS  is used, decrypted data
are used.
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.TP
.B \-\-no\-push
Disable server push.
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.TP
.B \-\-max\-concurrent\-streams=<N>
The  number of  concurrent  pushed  streams this  client
accepts.
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.B \-\-expect\-continue
Perform an Expect/Continue handshake:  wait to send DATA
(up to  a short  timeout)  until the server sends  a 100
Continue interim response. This option is ignored unless
combined with the \fI\%\-d\fP option.
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.TP
.B \-y, \-\-no\-verify\-peer
Suppress  warning  on  server  certificate  verification
failure.
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.TP
.B \-\-ktls
Enable ktls.
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.TP
.B \-\-version
Display version information and exit.
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.TP
.B \-h, \-\-help
Display this help and exit.
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.sp
The <SIZE> argument is an integer and an optional unit (e.g., 10K is
10 * 1024).  Units are K, M and G (powers of 1024).
.sp
The <DURATION> argument is an integer and an optional unit (e.g., 1s
is 1 second and 500ms is 500 milliseconds).  Units are h, m, s or ms
(hours, minutes, seconds and milliseconds, respectively).  If a unit
is omitted, a second is used as unit.
.SH SEE ALSO
.sp
\fBnghttpd(1)\fP, \fBnghttpx(1)\fP, \fBh2load(1)\fP
.SH AUTHOR
Tatsuhiro Tsujikawa
.SH COPYRIGHT
2012, 2015, 2016, Tatsuhiro Tsujikawa
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