URL from ra.json manifest:

"products_daily":
  png: [base_url]/[year]/[year][month]/[model]_[area]_[product]_[year][month][IT]_[FC].png
  html: [base_url]/[year]/[year][month]/[model]_[area]_[product]_[year][month].html

"products_monmean": 
   [base_url]/[year]/[year][month]/[model]_[area]_[product]_[year][month].[type]

"products_multiyear_monmean":
   [base_url]/[period]/[model]_[area]_[product]_m[month]_[period].[type]