R: эмуляция сложной формы с помощью httr

Я пытаюсь получить результатыэта форма сhttr.

Посмотреврезультаты формыЯ попробовал следующее:

library(httr)
library(stringr)

r = str_c("http://www.memoiredeshommes.sga.defense.gouv.fr/fr/arkotheque/",
          "client/mdh/base_morts_pour_la_france_premiere_guerre/index.php")

q = list(
  "action" = 1,
  "todo" = "rechercher",
  "le_id"  = "",
  "multisite" = "",
  "r_c_nom" = "mo",
  "r_c_nom_like" = 1,
  "r_c_prenom" = "",
  "r_c_prenom_like" = 1,
  "r_c_naissance_jour_mois_annee_jj_debut" = "",
  "r_c_naissance_jour_mois_annee_mm_debut" = "",
  "r_c_naissance_jour_mois_annee_yyyy_debut" = 1890,
  "r_c_naissance_jour_mois_annee_jj_fin" = "",
  "r_c_naissance_jour_mois_annee_mm_fin" = "",
  "r_c_naissance_jour_mois_annee_yyyy_fin" = "",
  "r_c_id_naissance_departement" = "",
  "hidden_c_id_naissance_departement" = "",
  "r_c_id_naissance_pays" = "",
  "hidden_c_id_naissance_pays" = "",
  "r_annot_c_id_grade" = "",
  "hidden_c_id_grade" = "",
  "r_annot_c_id_unite" = "",
  "hidden_c_id_unite" = "",
  "r_annot_c_id_recrutement_bureau" = "",
  "hidden_c_id_recrutement_bureau" = "",
  "r_annot_c_classe" = "",
  "r_annot_c_recrutement_matricule" = "",
  "r_annot_c_id_naissance_lieu" = "",
  "hidden_c_id_naissance_lieu" = "",
  "r_annot_c_deces_jour_mois_annee_jj_debut" = "",
  "r_annot_c_deces_jour_mois_annee_mm_debut" = "",
  "r_annot_c_deces_jour_mois_annee_yyyy_debut" = "",
  "r_annot_c_deces_jour_mois_annee_jj_fin" = "",
  "r_annot_c_deces_jour_mois_annee_mm_fin" = "",
  "r_annot_c_deces_jour_mois_annee_yyyy_fin" = "",
  "r_annot_c_id_deces_lieu" = "",
  "hidden_c_id_deces_lieu" = "",
  "r_annot_c_deces_lieu_complement" = "",
  "r_annot_c_deces_lieu_complement_like" = 1,
  "r_annot_c_id_deces_departement" = "",
  "hidden_c_id_deces_departement" = "",
  "r_annot_c_id_deces_pays" = "",
  "hidden_c_id_deces_pays" = "",
  "r_annot_c_id_transcription_etablissement_lieu" = "",
  "hidden_c_id_transcription_etablissement_lieu" = "",
  "r_annot_c_id_transcription_etablissement_departement" = "",
  "hidden_c_id_transcription_etablissement_departement" = "",
  "r_annot_c_id_transcription_etablissement_pays" = "",
  "hidden_c_id_transcription_etablissement_pays" = ""
)

t = GET(r, query = q, verbose())
writeLines(content(t, "text", encoding = "UTF-8"), "~/Desktop/test.html")

... который не работает вообще (все, что я получаю, этоNA).

Что я делаю неправильно?

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