Unclear error when using input data.frame of more than 2 columns

[Rekyt]

Hi TNRS maintainers 👋

I really like the feature that let's the user submit a data.frame to the TNRS() function so that they can be easily referred in other contexts.
However, I had a 3 columns data.frame that also included some additional info on the names, then the function output a strange error.
I perfectly understand why TNRS() would only accept 2 columns data.frame and I have an easy fix for that, but maybe the error message could be clearer.

reprex:

# Works fine with a 2 columns dataset
TNRS::TNRS(data.frame(ID = 1, name = "Helianthus annuus"))
#>   ID    Name_submitted Overall_score Name_matched_id      Name_matched
#> 1  1 Helianthus annuus             1           51089 Helianthus annuus
#>   Name_score Name_matched_rank Author_submitted Author_matched Author_score
#> 1          1           species                                           NA
#>   Canonical_author Name_matched_accepted_family Genus_submitted Genus_matched
#> 1               L.                   Asteraceae      Helianthus    Helianthus
#>   Genus_score Specific_epithet_submitted Specific_epithet_matched
#> 1           1                     annuus                   annuus
#>   Specific_epithet_score Family_submitted Family_matched Family_score
#> 1                      1                                           NA
#>   Infraspecific_rank Infraspecific_epithet_matched Infraspecific_epithet_score
#> 1                                                                           NA
#>   Infraspecific_rank_2 Infraspecific_epithet_2_matched
#> 1                                                     
#>   Infraspecific_epithet_2_score Annotations Unmatched_terms
#> 1                            NA                            
#>                       Name_matched_url Name_matched_lsid Phonetic
#> 1 http://www.tropicos.org/Name/2700851                          Y
#>   Taxonomic_status     Accepted_name  Accepted_species Accepted_name_author
#> 1         Accepted Helianthus annuus Helianthus annuus                   L.
#>   Accepted_name_id Accepted_name_rank                    Accepted_name_url
#> 1            51089            species http://www.tropicos.org/Name/2700851
#>   Accepted_name_lsid Accepted_family Overall_score_order Highertaxa_score_order
#> 1                         Asteraceae                   1                      1
#>     Source Warnings
#> 1 tropicos        0

# Strange error message when having more than 2 columns
TNRS::TNRS(data.frame(ID = 1, name = "Helianthus annuus", other_name = "bla"))
#> Problem with the API: HTTP Status 400
#> NULL

^{Created on 2023-02-08 with reprex v2.0.2}

Session info

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
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#>  ctype    fr_FR.UTF-8
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#>  date     2023-02-08
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#> 
#>  [1] C:/Users/ke76dimu/Documents/R/R-4.2.0/library
#> 
#> ──────────────────────────────────────────────────────────────────────────────

[ojalaquellueva]

@Rekyt An http status code from the API means a badly-formed request. @bmaitner please check the structure of the options and data elements of the JSON in the POST request. Also, I recommend returning a simple "Error: badly formed API call" when your code detects at http response of 400.