Try %2C instead of comma in the url definition. I know it sound stupid but it usually works 😊

Ah - thank you! Yes that is wierd but as long as it works...:-)

You can use a TextEncoder set to URL(Percent Encoding) to do this automatically

Apologies both but still having problems with this. Whether I use the stringReplacer or TextEncoder there's still an issue.

When I pass my list into the api as

3701,3707,3710,3808,3809,3810,3817,3820,3823,3824,3827,3831,3837,3839,3840,3844,99001,99081,99085,99094,99190,2003806,2003839,2003920,2003933,3203069,3203075,3603006,3603007,3603033,3603051,4603039,4603042,4603043,4603044,4603045,4603046,4603047,4603048,4603049,4603050,4603051,4603052,4603053,4603054,4603055,4603056,4603057,4603058,4603126,4603127,4603128,4603129,4603164,4603165,4603166,4603167,4603168,4603169,4603170,4603171,4603172,4603173,4603174,4603175,4603176,4603177,4803028,6103021,6103026,6103034,6103050,6103051,6103063,6103066,6103072,6103077,6103080,6103093,6103099,6103100,6103104,6103129,6103154,6103155,6103161,6103162,6103170,6103173,6103187,6103193,6103211,6103215,6103244,6103274,6103286,6103293,6103302,6103303,6103314,6103317,6103335,6103348,6103351,6103353,6103355,6103364,6103367,6103369,6103392,6103395,6103400,6103402,6103406,6103415,6103430,6103433,6103475,6103507,6103519,6103520,6103532,6103539,6103568,6103574,6103578,6103594,6103621,6103623,6103646,6103647,6103651,6103695,6103696,6103702,6103704,6103709,6103732,6103754,6103759,6103760,6103762,6103780,6103785,6103795,6103802,6103806,6103808,6103813,6103823,6103825,6103828,6103838,6103839,6103840,6103857,6103859,6103866,6103869,6103873,6103880,6103887,6103888,6103889,6103894,3862,3203067,3203073,4603003,4603004,4603005,4603009,4803026,6103471,6103625,6103779

its parsed as

https://point-observation.weather.mg/observation/search?meteoGroupStationIds=3701%2C3707%2C3710%2C3808%2C3809%2C3810%2C3817%2C3820%2C3823%2C3824%2C3827%2C3831%2C3837%2C3839%2C3840%2C3844%2C99001%2C99081%2C99085%2C99094%2C99190%2C2003806%2C2003839%2C2003920%2C2003933%2C3203069%2C3203075%2C3603006%2C3603007%2C3603033%2C3603051%2C4603039%2C4603042%2C4603043%2C4603044%2C4603045%2C4603046%2C4603047%2C4603048%2C4603049%2C4603050%2C4603051%2C4603052%2C4603053%2C4603054%2C4603055%2C4603056%2C4603057%2C4603058%2C4603126%2C4603127%2C4603128%2C4603129%2C4603164%2C4603165%2C4603166%2C4603167%2C4603168%2C4603169%2C4603170%2C4603171%2C4603172%2C4603173%2C4603174%2C4603175%2C4603176%2C4603177%2C4803028%2C6103021%2C6103026%2C6103034%2C6103050%2C6103051%2C6103063%2C6103066%2C6103072%2C6103077%2C6103080%2C6103093%2C6103099%2C6103100%2C6103104%2C6103129%2C6103154%2C6103155%2C6103161%2C6103162%2C6103170%2C6103173%2C6103187%2C6103193%2C6103211%2C6103215%2C6103244%2C6103274%2C6103286%2C6103293%2C6103302%2C6103303%2C6103314%2C6103317%2C6103335%2C6103348%2C6103351%2C6103353%2C6103355%2C6103364%2C6103367%2C6103369%2C6103392%2C6103395%2C6103400%2C6103402%2C6103406%2C6103415%2C6103430%2C6103433%2C6103475%2C6103507%2C6103519%2C6103520%2C6103532%2C6103539%2C6103568%2C6103574%2C6103578%2C6103594%2C6103621%2C6103623%2C6103646%2C6103647%2C6103651%2C6103695%2C6103696%2C6103702%2C6103704%2C6103709%2C6103732%2C6103754%2C6103759%2C6103760%2C6103762%2C6103780%2C6103785%2C6103795%2C6103802%2C6103806%2C6103808%2C6103813%2C6103823%2C6103825%2C6103828%2C6103838%2C6103839%2C6103840%2C6103857%2C6103859%2C6103866%2C6103869%2C6103873%2C6103880%2C6103887%2C6103888%2C6103889%2C6103894%2C3862%2C3203067%2C3203073%2C4603003%2C4603004%2C4603005%2C4603009%2C4803026%2C6103471%2C6103625%2C6103779&observedPeriod=PT0S%2CPT1H%2CPT3H%2CPT6H%2CPT12H%2CPT24H&fields=airTemperatureInCelsius%2CmaxWindGustInKilometerPerHour%2CsunshineDurationInMinutes%2CtemperatureMaxInCelsius%2CtemperatureMinInCelsius%2CwaterTemperatureInCelsius

Can't find a way so far to prevent this from happening!

The API should work regardless of the encoding of commas.

What error message are you getting?

Maybe you got the parameters order wrong. You should see more examples here