# Short chains transition to longer information

Debugging Tools

Interface should be called on the server side, not in the front end (Weixin Mini Program, web pages, APP, etc.) directly called, specific reference interface call guide

Interface name: fetchShorten

Developers can convert long information not more than 4KB into short-chain key through GenShorten, and then restore short-chain key to long information through FetchShorten.

# 1. How to call

# HTTPS calls

POST https://api.weixin.qq.com/cgi-bin/shorten/fetch?access_token=ACCESS_TOKEN

# Cloud Calls

Call method: officialAccount.shorten.fetch
The input and exit parameters are the same as the HTTPS call, which can be called in the cloud call documentation

# Third party invocation

Third Party Platform calls are not supported by this interface.

# 2. Request parameters

# Query parameters`Query String parameters`

Parameter Name	type	Required to fill in	Introductions
access_token	string	yes	Interface invoke credentials, using access_token

# Request Body`Request Payload`

Parameter Name	type	Required to fill in	Example	Introductions
short_key	string	yes	iTqRJFSEqk9RvPk	Shortkey

# 3. Return Parameters

# `Response Payload`

Parameter Name	type	Introductions
errcode	number	Error code
errmsg	string	Error message
long_data	string	Long information
create_time	timestamp	Created timestamp
expire_seconds	number	Number of remaining expiration seconds

# 4. Note

There are no special considerations for this interface

# 5. Code examples

Example Requests

{
  "short_key": "iTqRJFSEqk9RvPk"
}

Return an example

{
  "errcode": 0,
  "errmsg": "ok",
  "long_data": "loooooong data",
  "create_time": 1611047541,
  "expire_seconds": 86300
}

# 6. Error code

The following is a list of error codes for this interface, other error codes can refer to General error codes

Error code	Error Description	Solutions
-1	system error	The system is busy, so the developer is asked to try again in a few minutes.
44002	empty post data	The POST number is empty. The post request body parameter cannot be empty.
47001	data format error	Error parsing JSON / XML content; Missing parameters in post data; The review was amended and a second attempt was made.
47003	argument invalid!	Template parameter is inaccurate, may be empty or does not meet the rules, errmsg will indicate which field is wrong
9410012	This page does not exist / is not available.

# 7. Scope of application

The interface has not yet clarified the types of account numbers that can be invoked, or determined whether they can be invoking based on the invoking reference in the business, provided that the actual call is already made.