All about HCY Files

The HCY file type is primarily associated with Charles Proxy.

HCY	File extension: HCY
	File type:	network log file

What is an HCY file?

HCY files mostly belong to Charles Proxy. HCY files store captured HTTP communications used mainly for network debugging. They can contain data from HTTP request or HTTP response events.
Tools like Charles Proxy generate HCY files to log HTTP requests. Other applications such as HttpCanary and HTTP Catcher also use this file format for capturing HTTP responses or a mix of both.
Details inside an HCY file include elements like request methods, URLs, headers, and response status codes.
Key details compiled by FilExt.com:

HTTP Request Data: Stores information sent by a client.

HTTP Response Data: Stores details returned by a server.

FilExt.com tip: This data log is essential for technical troubleshooting and web debugging.

How do you open HCY files?

You need a suitable software like Charles Proxy to open an HCY file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your HCY file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a HCY file directly in the browser:. Just drag the file onto this browser window and drop it.

Online HCY Text Viewer

Choose your .hcy file to analyze

or drag and drop it here

Online File Viewer

✈

Read our privacy guarantee in Filext’s terms and privacy policy

Please allow ads on our site

This helps us keep our servers running. Then re-upload your file to view it.

Click here to see how to disable the ad blocker for filext.com

Programs that open and convert HCY files:

Charles Proxy
See the previous paragraphs to learn more about the main application. HCY files are often referred to as Charles Proxy developers because this type of file is primarily created or used by this software.
Charles Proxy, HTTP Catcher, HttpCanary
*.HCY files primarily store HTTP requests and responses, capturing web traffic data. They are mainly generated by Charles Proxy, HTTP Catcher, and HttpCanary, tools used for web debugging and analysis. These files help developers and testers inspect HTTP communication, analyze performance bottlenecks, and troubleshoot web applications. The files contain details such as HTTP headers, request/response bodies, and other relevant information for analyzing web interactions. This file format is classified as Developer Files.

HCY file format:

To view or edit HCY files you need to know the file format, because it determines how the data in this file is stored. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Below you will find our evaluation of the HCY files:

The HCY file extension is not widely used. Such a file is used by a few programs, each with its own file format. But the following two file formats are common:

45% of all HCY files start with the magic bytes POST , which are always the first bytes of this file format. These files are text files, so they contain words and text. The file size is in the range of 920 bytes to 13 KB. The file type is very recent. Certain words are almost always found in the files, such as POST, content, model, sdkVersion, appId: 1001, os: android, osver, report HTTP, shopee-traceid, shpsec, brand, postType: 1, szdet, Host and user. A common filename is request.hcy. These files can be linked to http and note.
25% of all HCY files start with the bytes HTTP/1.1 crucial for this file format. If you open these files in a text editor, you will see only illegible characters. HCY files are between 380 bytes and 160 KB in size. The files contain the following words: Content-Type, HTTP/1.1 200 OK, Date, Server, application, Connection: keep-alive, utf-8, charset, json, Content-Length, Accept and Transfer-Encoding: chunked. The file name response.hcy is typical for these files.

The remaining 30% of all HCY files are files with no common format, frequently e.g. GET. You can get all the details of your HCY file by dragging it onto this page or by clicking the button "Choose your .hcy file to analyze" above.

Technical Data for HCY File Extension

File classification:

Developer

Related files:

har, cap, pcap, hct, hyc, chls, log, txt

an hcy network log file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with HCY files

Associate the HCY file extension with the correct application.
Update your software that should actually open network log files. Because only the current version supports the latest HCY file format. Search, therefore, e.g. on the manufacturer website after an available Charles Proxy update.
To make sure that your HCY file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .HCY file online - secure, fast, and no downloads needed.