Add HTTP connector payload size limit

Author: linda33wj

articles/data-factory/connector-http.md

@@ -12,7 +12,7 @@ ms.workload: data-services
 ms.tgt_pltfrm: na
 ms.devlang: na
 ms.topic: conceptual
-ms.date: 05/22/2018
+ms.date: 08/24/2018
 ms.author: jingwang
 
 ---
@@ -166,6 +166,9 @@ To copy data from HTTP, set the type property of the dataset to **HttpFile**. Th
 | format | If you want to **retrieve data from HTTP endpoint as-is** without parsing it and copy to a file-based store, skip the format section in both input and output dataset definitions.<br/><br/>If you want to parse the HTTP response content during copy, the following file format types are supported: **TextFormat**, **JsonFormat**, **AvroFormat**, **OrcFormat**, **ParquetFormat**. Set the **type** property under format to one of these values. For more information, see [Json Format](supported-file-formats-and-compression-codecs.md#json-format), [Text Format](supported-file-formats-and-compression-codecs.md#text-format), [Avro Format](supported-file-formats-and-compression-codecs.md#avro-format), [Orc Format](supported-file-formats-and-compression-codecs.md#orc-format), and [Parquet Format](supported-file-formats-and-compression-codecs.md#parquet-format) sections. |No |
 | compression | Specify the type and level of compression for the data. For more information, see [Supported file formats and compression codecs](supported-file-formats-and-compression-codecs.md#compression-support).<br/>Supported types are: **GZip**, **Deflate**, **BZip2**, and **ZipDeflate**.<br/>Supported levels are: **Optimal** and **Fastest**. |No |
 
+>[!NOTE]
+>The supported HTTP request payload size is around 500KB. If the payload size you want to pass to your web endpoint is larger than this, consider to batch into smaller chunks.
+
 **Example 1: using Get method (default)**
 
 ```json