Maximum URL length which is 'safe' in outlook api get requests

Question

I am using outlook rest api v2 (https://msdn.microsoft.com/en-us/office/office365/api/api-catalog)

What is the maximum URL length which is 'safe' for a get request. In my case i would like to request the messages from a group of several conversations. I came up with a request looking something like this (assume conversation IDs are different):

https://outlook.office.com/api/v2.0/me/mailfolders/inbox/messages?$filter=ConversationId eq 'AAQkADNjZDVkNTljLTMwNmEtNDM1Yi1iZjgyLTAwNTgzYzBmNDc4NQAQAA6kWdKUPhNGknn6sPucTnE=' or ConversationId eq 'AAQkADNjZDVkNTljLTMwNmEtNDM1Yi1iZjgyLTAwNTgzYzBmNDc4NQAQAA6kWdKUPhNGknn6sPucTnE=' or ConversationId eq 'AAQkADNjZDVkNTljLTMwNmEtNDM1Yi1iZjgyLTAwNTgzYzBmNDc4NQAQAA6kWdKUPhNGknn6sPucTnE='

I was wondering how many of those 'or' clauses can i safely join in one request. Are there any limitations in Outlook API aside from the 'standard' URL length limitations?

Answer 1

You should rather use $batch (documented here: https://msdn.microsoft.com/en-us/office/office365/api/batch-outlook-rest-requests).

Put each filter in its own query. I believe you can make up to 20 requests.