of the given patterns (in the style of \fBstring match\fR.)
.VE 8.6
.TP
\fBdict filter \fIdictionaryValue \fBscript {\fIkeyVariable valueVariable\fB} \fIscript\fR
.
The script rule tests for matching by assigning the key to the
\fIkeyVariable\fR and the value to the \fIvalueVariable\fR, and then evaluating
the given script which should result in a boolean value (with the
key/value pair only being included in the result of the \fBdict
filter\fR when a true value is returned.)  Note that the first
argument after the rule selection word is a two-element list.  If the
\fIscript\fR returns with a condition of \fBTCL_BREAK\fR, no further
key/value pairs are considered for inclusion in the resulting
dictionary, and a condition of \fBTCL_CONTINUE\fR is equivalent to a false
result. The key/value pairs are tested in the order in which the keys

the HTTP operation is done in the background.
\fB::http::geturl\fR returns immediately after generating the
HTTP request and the callback is invoked
when the transaction completes.  For this to work, the Tcl event loop
must be active.  In Tk applications this is always true.  For pure-Tcl
applications, the caller can use \fB::http::wait\fR after calling
\fB::http::geturl\fR to start the event loop.
.PP
\fBNote:\fR The event queue is even used without the \fB-command\fR option.
As a side effect, arbitrary commands may be processed while \fBhttp::geturl\fR is running.
.SH COMMANDS
.TP
\fB::http::config\fR ?\fIoptions\fR?
.
The \fB::http::config\fR command is used to set and query the name of the
proxy server and port, and the User-Agent name used in the HTTP
requests.  If no options are specified, then the current configuration

Select the HTTP protocol version to use. This should be 1.0 or 1.1 (the
default). Should only be necessary for servers that do not understand or
otherwise complain about HTTP/1.1.
.TP
\fB\-query\fR \fIquery\fR
.
This flag causes \fB::http::geturl\fR to do a POST request that passes the
\fIquery\fR as payload verbatim to the server.
The content format (and encoding) of \fIquery\fR is announced by the header
field \fBcontent-type\fR set by the option \fB-type\fR.
\fIquery\fR is an x-url-encoding formatted query, if used for html forms.
The \fB::http::formatQuery\fR procedure can be used to do the formatting.

.TP
\fB\-queryblocksize\fR \fIsize\fR
.
The block size used when posting query data to the URL.
At most
\fIsize\fR
bytes are written at once.  After each block, a call to the

If the server closes the socket without replying, then no error
is raised, but the status of the transaction will be \fBeof\fR.
.TP
\fBerror\fR
.
The error message will also be stored in the \fBerror\fR status
array element, accessible via \fB::http::error\fR.
.TP\fR
.\fBtimeout
A timeout occurred before the transaction could complete
.TP\fR
.\fBreset
user-reset
.PP
Another error possibility is that \fB::http::geturl\fR is unable to
write all the post query data to the server before the server
responds and closes the socket.
The error message is saved in the \fBposterror\fR status array
element and then  \fB::http::geturl\fR attempts to complete the
transaction.

\fBposterror\fR
.
The error, if any, that occurred while writing
the post query data to the server.
.TP
\fBstatus\fR
.
See description in the chapter \fBERRORS\fR above for a
list and description of \fBstatus\fR.

During the transaction this value is the empty string.
.TP
\fBtotalsize\fR
.
A copy of the \fBContent-Length\fR meta-data value.
.TP
\fBtype\fR
.