[MapProxy] MapProxy with tiles parameter in the WMS request

[Stefan Peuser]

I have configured an OSM WMS with MapProxy. The yaml file is listed below. 
The WMS works for example in QGIS. In other clients, however, I get the 
error "Request too large or invalid BBOX".

Request: 
https://myserver/osm/service?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&LAYERS=osm&TILED=true&WIDTH=256&HEIGHT=256&SRS=EPSG%3A25832&STYLES=&BBOX=317622.07742450386%2C5729413.627388174%2C320065.3241739231%2C5731856.874137593
:
The problem seems to be the parameter Tiles = true. The parameter is set 
via the clients. If I change the value to false I get a result (here a 
png). The BBOX in the WMS request is within the defined BBOX in the yaml 
and the data. I haven't found any ways to solve the problem so far. What 
else can help? 

Many greetings
Stefan

services:
  demo:

  wms:
    srs: ['CRS:84','EPSG:3857','EPSG:4326','EPSG:25832']
    #bbox_srs: ['EPSG:3857','EPSG:4326','EPSG:25832']
    bbox_srs:
      - 'EPSG:3857'
      - 'EPSG:4326'
      - srs: 'EPSG:25832'
        bbox: [312500, 5695500, 358000, 5744000]
    image_formats: ['image/png', 'image/jpeg', 'image/png; mode=8bit', 
'image/png; mode=32bit']
    versions: ['1.3.0', '1.1.1']
    featureinfo_types: ['text', 'html', 'xml', 'json']
    md:
      ...

layers:
  - name: osm
    title: OpenStreetMap
    sources: [osm_cache]
    md:
        abstract: Darstellung der OpenStreetMap-Daten im 
Standard-Mapnik-Stil
 
caches:
  osm_cache:
    grids: [osm_grid]
    sources: [osm_tiles]
    format: image/png
 
sources:
   osm_tiles:
     type: tile
     url: https://myserver/openstreetmap/%(z)s/%(x)s/%(y)s.png
     grid: osm_grid
 
grids:
  osm_grid:
    base: GLOBAL_MERCATOR
    srs: EPSG:900913
    origin: nw

globals:
  cache:
    base_dir: ./cache_data/osm
    lock_dir: './cache_data/locks'

  image:
      resampling_method: bilinear
      jpeg_quality: 100
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