Initializing help system before first use

# dmphttppatch

Purpose
Make an HTTP PATCH request to path within an initialized dmpresource.
Synopsis
`function dmphttppatch(res:dmpresource, path:text, data:text, result:text):integer`
`function dmphttppatch(res:dmpresource, path:text, data:text, result:text, xhdr:text):integer`
Arguments

res | The dmpresource we want to access.
path | The path we want to access within the DMP resource
data | Data file to be sent as the request body
result | File to store the result of the request
xhdr | Additional headers to add to the request

Return value
The HTTP status code of the request, or 999 on a connection error.
Example

    declarations
      res: dmpresource
      httpstatus: integer
    end-declarations
    dmpinitcomp(res,"Xpress Executor")

    httpstatus := dmphttppatch(res,'/rest/runtime/execution',
      'executionrequest.json', 'execution.json')
    if httpstatus<>200 then
      if res.status<>DMP_OK then
        writeln('DMP Resource error: ',res.lasterror)
      else
        writeln('Unexpected HTTP status code: ',httpstatus)
      end-if
    end-if

Further information
1. This function corresponds to the httppatch function of the mmhttp module and works in a similar way.
2. The request path is relative to the DMP resource's URL, unless it starts with the same path as the DMP resource URL and the abspath attribute has not been set to false, in which case it will be treated as an absolute path.
3. The outgoing HTTP request will be automatically augmented with the appropriate credentials for this type of dmpresource.
4. In event of an unexpected failure, the request will be retried the number of times specified by dmp_max_retries if it returned a HTTP status code listed in dmp_retry_error_codes.
5. If this function returns an unexpected HTTP status code, you should check the status attribute of the dmpresource to see whether this was returned from the HTTP webservice or was the result of an error obtaining credentials.
Parent Topic Procedures and functions

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