Fwd: Errors deploying collection

Dear list,
This is technically an expath problem rather than an eXist problem, but I
was hoping that the accumulated knowledge on the list might provide a quick
fix and that this is not list abuse.

I am upgrading an app from eXist version 4 to 5+ and need to rewrite an
http-post request in one function from the older http-client to the new
expath http client. In the attached xql file the post request begins at
line 102.

My attempted rewrite is wrong. I've tried the following, where $tokens is a
json represntation of textual data from which CollateX
<https://collatex.net> generates an alignment table that is returned in
json as $results

let $results := parse-json(
        content:get-metadata-and-content(
        http:send-request(<http:request href="
http://52.12.26.11:8080/collatex/collate" method="post">
        <http:body media-type="text/plain"
content-type="text/plain">{($tokens,$headers)}</http:body>
        </http:request>
        )))
        return ... (: do stuff with $results :)

Unfortunately, I cannot figure out how to address the error report
("Invalid attributes") that eXist returns.

/db/apps/digitalmishnah/modules/view.xqlerr:XPTY0004 checking function
> parameter 1 in call
> contentextraction:get-metadata-and-content(untyped-value-check[xs:base64Binary,
> hc:send-request(element {"http:request"} { attribute {href} {
> http://52.12.26.11:8080/collatex/collate } attribute {method} { post }
> text { } element {"http:body"} { attribute {media-type} { text/plain }
> attribute {content-type} { text/plain } { ( $tokens, $headers ) } } text {
> } } )]): Invalid attributes [at line 106, column 9] In function:
> cmp:compare-mishnah(node(), xs:string, xs:string*, xs:string)
> [41:7:/db/apps/digitalmishnah/modules/compare.xql] cmp:compare-view(node(),
> map(*)) [-1:-1:/db/apps/digitalmishnah/modules/compare.xql]
> templates:process-output(element(), map(*), item()*, element(function))
> [211:9:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:call-by-introspection(element(), map(*), map(*), function(*))
> [189:28:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:call(item(), element(), map(*))
> [137:36:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [148:81:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [148:81:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [148:81:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [148:81:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [148:81:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [148:81:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [148:81:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [428:17:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process-output(element(), map(*), item()*)
> [230:9:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process-output(element(), map(*), item()*, element(function))
> [211:9:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:call-by-introspection(element(), map(*), map(*), function(*))
> [189:28:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:call(item(), element(), map(*))
> [137:36:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [133:51:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:process(node()*, map(*))
> [90:9:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]
> templates:apply(node()+, function(*), map(*)?, map(*)?)
> [53:5:C:\users\hlapin\eXist-db-6.0.1\data\expathrepo\shared-0.9.1\content\templates.xql]


I'd be truly grateful for any pointers.

Many thanks,
HL

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