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Pub Version

A simple Dio interceptor for pretty printing the HTTP request/response (using the awesome package Logger) to be printed in the console for easier debugging and sharing.

Different content types are supported and pretty printed such as:

  • application/json
  • application/x-www-form-urlencoded
  • text/html

Getting started

1- Install the package in your project:

flutter pub get dio_http_formatter

or if not for Flutter:

pub get dio_http_formatter

2- Add the interceptor to your Dio instance like:

final _dio = Dio();
_dio.interceptors.add(HttpFormatter());

Dio Version Map

For a certain version of Dio, use the following table to find the correct version of this package to use:

Dio Version Package Version
4.x.x 2.x.x
5.x.x 3.x.x

Options

Below are the optional parameters that can be specified for the formatter to customize what and how the HTTP request and response is printed.

Property Type Default Value
includeRequest bool true
includeRequestHeaders bool true
includeRequestQueryParams bool true
includeRequestBody bool true
includeResponse bool true
includeResponseHeaders bool true
includeResponseBody bool true
logger Logger PrettyPrinter()
loggingFilter LoggingFilter null

Logging Filter

The HTTPFormatter has support for filtering whether to log a request/response or not. For example:

final dio = Dio();
dio.interceptors.add(
  HttpFormatter(
    loggingFilter: (request, response, error) {
      // We don't want to print the request/response when 201 is returned
      if (response?.statusCode == 201) {
        return false;
      }
      // Otherwise, the logs should print
      return true;
    },
  ),
);

Warning

httpLoggerFilter is now deprecated and it's highly encouraged to move to the new loggingFilter. httpLoggerFilter will be removed in the next major version.

Examples

POST request [application/json]

  await _dio.post('https://postman-echo.com/post',
      data: <String, dynamic>{'foo': 'foo'},
      options: Options()
        ..headers = <String, dynamic>{
          'my-custom-header': 'my-custom-header',
          'content-type': 'application/json'
        });
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
│ ⤴ REQUEST ⤴
│ 
│ POST https://postman-echo.com/post
│ content-type: application/json
│ my-custom-header: my-custom-header
│ content-length: 13
│ 
│ 
│ {
│   "foo": "foo"
│ }
│ 
│ ⤵ RESPONSE [200/OK] [Time elapsed: 1080 ms]⤵
│ 
│ connection: [keep-alive]
│ set-cookie: [sails.sid=s%3AlO2moZlJ_-LGJZdq_o0KRpliqamhCecq.lNnUP5X%2Fvr%2BXi2an7q6GJki9DPmDQyPAyBW7p117ijM; Path=/; HttpOnly]
│ date: [Mon, 22 Jun 2020 17:29:07 GMT]
│ vary: [Accept-Encoding]
│ content-length: [417]
│ etag: [W/"1a1-14yzanqIFzi16qAA3YVbkp9Acl8"]
│ content-type: [application/json; charset=utf-8]
│ 
│ 
│ {
│   "args": {},
│   "data": {
│     "foo": "foo"
│   },
│   "files": {},
│   "form": {},
│   "headers": {
│     "x-forwarded-proto": "https",
│     "x-forwarded-port": "443",
│     "host": "postman-echo.com",
│     "x-amzn-trace-id": "Root=1-5ef0ea63-50bc2440e0e07883458a067f",
│     "content-length": "13",
│     "user-agent": "Dart/2.8 (dart:io)",
│     "content-type": "application/json",
│     "my-custom-header": "my-custom-header",
│     "accept-encoding": "gzip"
│   },
│   "json": {
│     "foo": "foo"
│   },
│   "url": "https://postman-echo.com/post"
│ }
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

POST request [multipart/form-data]

await dio.post(
    "https://postman-echo.com/post",
    data: FormData.fromMap({
      "foo": "foo",
      "bar": MultipartFile.fromBytes([1, 2, 3, 4, 5, 6])
    }),
  );
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
│ ⤴ REQUEST ⤴
│ 
│ POST https://postman-echo.com/post
│ content-type: multipart/form-data; boundary=--dio-boundary-0846883596
│ content-length: 234
│ 
│ 
│ {
│   "foo": "foo",
│   "bar": "[application/octet-stream; length=6]"
│ }
│ 
│ ⤵ RESPONSE [200/OK] [Time elapsed: 1431 ms]⤵
│ 
│ etag: [W/"238-Drbr+mbesAC7mnUT1/6HdwqJbOg"]
│ connection: [keep-alive]
│ content-type: [application/json; charset=utf-8]
│ set-cookie: [sails.sid=s%3AYZPFhMKwqVTkLbZkRSbdqY_ZGZYFul8h.UrGXXLdzjfYJEdEVOlpQND2Ms3KnpKomTNQh42u3tS4; Path=/; HttpOnly]
│ date: [Sun, 19 Mar 2023 12:39:21 GMT]
│ content-length: [568]
│ 
│ 
│ {
│   "args": {},
│   "data": {},
│   "files": {
│     "undefined": "data:application/octet-stream;base64,AQIDBAUG"
│   },
│   "form": {
│     "foo": "foo"
│   },
│   "headers": {
│     "x-forwarded-proto": "https",
│     "x-forwarded-port": "443",
│     "host": "postman-echo.com",
│     "x-amzn-trace-id": "Root=1-64170279-48f590a477b666d63975dd13",
│     "content-length": "234",
│     "user-agent": "Dart/2.19 (dart:io)",
│     "content-type": "multipart/form-data; boundary=--dio-boundary-0846883596",
│     "accept-encoding": "gzip"
│   },
│   "json": null,
│   "url": "https://postman-echo.com/post"
│ }
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

POST request [application/x-www-form-urlencoded]

await dio.post(
    "https://postman-echo.com/post",
    data: {
      "foo": "foo",
      "bar": "bar",
    },
    options: Options(
      contentType: Headers.formUrlEncodedContentType,
    ),
  );
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
│ ⤴ REQUEST ⤴
│ 
│ POST https://postman-echo.com/post
│ content-type: application/x-www-form-urlencoded
│ content-length: 15
│ 
│ 
│ {
│   "foo": "foo",
│   "bar": "bar"
│ }
│ 
│ ⤵ RESPONSE [200/OK] [Time elapsed: 1419 ms]⤵
│ 
│ etag: [W/"213-RckysDJgyaHU3rsP8vCoDnqI4Pg"]
│ connection: [keep-alive]
│ content-type: [application/json; charset=utf-8]
│ set-cookie: [sails.sid=s%3AxDq5jvVLfuAkxh5o0pUhZOLzkqPt4xBz.apV3a%2FKrhiKWA%2B7foUqihO0BMGTnCOwVSiiW93CBozo; Path=/; HttpOnly]
│ date: [Sun, 19 Mar 2023 12:42:13 GMT]
│ content-length: [531]
│ 
│ 
│ {
│   "args": {},
│   "data": "",
│   "files": {},
│   "form": {
│     "foo": "foo",
│     "bar": "bar"
│   },
│   "headers": {
│     "x-forwarded-proto": "https",
│     "x-forwarded-port": "443",
│     "host": "postman-echo.com",
│     "x-amzn-trace-id": "Root=1-64170325-433157c952cf5ed84f36f867",
│     "content-length": "15",
│     "user-agent": "Dart/2.19 (dart:io)",
│     "content-type": "application/x-www-form-urlencoded",
│     "accept-encoding": "gzip"
│   },
│   "json": {
│     "foo": "foo",
│     "bar": "bar"
│   },
│   "url": "https://postman-echo.com/post"
│ }
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Successful GET request [text/html]

await _dio.get('https://example.org');
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
│ ⤴ REQUEST ⤴
│ 
│ GET https://example.org
│ 
│ 
│ ⤵ RESPONSE [200/OK] [Time elapsed: 963 ms]⤵
│ 
│ cache-control: [max-age=604800]
│ last-modified: [Thu, 17 Oct 2019 07:18:26 GMT]
│ date: [Mon, 22 Jun 2020 17:34:41 GMT]
│ content-encoding: [gzip]
│ vary: [Accept-Encoding]
│ age: [336678]
│ content-type: [text/html; charset=UTF-8]
│ server: [ECS (dcb/7FA3)]
│ accept-ranges: [bytes]
│ content-length: [648]
│ etag: ["3147526947"]
│ x-cache: [HIT]
│ expires: [Mon, 29 Jun 2020 17:34:41 GMT]
│ 
│ 
│ <!doctype html>
│ <html>
│ <head>
│     <title>Example Domain</title>
│ 
│     <meta charset="utf-8" />
│     <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
│     <meta name="viewport" content="width=device-width, initial-scale=1" />
│     <style type="text/css">
│     body {
│         background-color: #f0f0f2;
│         margin: 0;
│         padding: 0;
│         font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
│         
│     }
│     div {
│         width: 600px;
│         margin: 5em auto;
│         padding: 2em;
│         background-color: #fdfdff;
│         border-radius: 0.5em;
│         box-shadow: 2px 3px 7px 2px rgba(0,0,0,0.02);
│     }
│     a:link, a:visited {
│         color: #38488f;
│         text-decoration: none;
│     }
│     @media (max-width: 700px) {
│         div {
│             margin: 0 auto;
│             width: auto;
│         }
│     }
│     </style>    
│ </head>
│ 
│ <body>
│ <div>
│     <h1>Example Domain</h1>
│     <p>This domain is for use in illustrative examples in documents. You may use this
│     domain in literature without prior coordination or asking for permission.</p>
│     <p><a href="https://www.iana.org/domains/example">More information...</a></p>
│ </div>
│ </body>
│ </html>
│ 
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Successful GET request with Query Params [text/html]

  await _dio.get('https://example.com',
        queryParameters: {'limit_start': 0, 'search_term': 'dart'});
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
│ ⤴ REQUEST ⤴
│ 
│ GET https://example.com
│ 
│ ===== Query Parameters =====
│ limit_start : 0
│ search_term : dart
│ 
│ ⤵ RESPONSE [200/OK] [Time elapsed: 1204 ms]⤵
│ 
│ last-modified: [Thu, 17 Oct 2019 07:18:26 GMT]
│ cache-control: [max-age=604800]
│ date: [Fri, 26 Nov 2021 12:04:26 GMT]
│ vary: [Accept-Encoding]
│ content-encoding: [gzip]
│ content-length: [648]
│ age: [86638]
│ etag: ["3147526947+gzip"]
│ content-type: [text/html; charset=UTF-8]
│ x-cache: [HIT]
│ server: [ECS (oxr/8317)]
│ expires: [Fri, 03 Dec 2021 12:04:26 GMT]
│ 
│ 
│ <!doctype html>
│ <html>
│ <head>
│     <title>Example Domain</title>
│ 
│     <meta charset="utf-8" />
│     <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
│     <meta name="viewport" content="width=device-width, initial-scale=1" />
│     <style type="text/css">
│     body {
│         background-color: #f0f0f2;
│         margin: 0;
│         padding: 0;
│         font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
│         
│     }
│     div {
│         width: 600px;
│         margin: 5em auto;
│         padding: 2em;
│         background-color: #fdfdff;
│         border-radius: 0.5em;
│         box-shadow: 2px 3px 7px 2px rgba(0,0,0,0.02);
│     }
│     a:link, a:visited {
│         color: #38488f;
│         text-decoration: none;
│     }
│     @media (max-width: 700px) {
│         div {
│             margin: 0 auto;
│             width: auto;
│         }
│     }
│     </style>    
│ </head>
│ 
│ <body>
│ <div>
│     <h1>Example Domain</h1>
│     <p>This domain is for use in illustrative examples in documents. You may use this
│     domain in literature without prior coordination or asking for permission.</p>
│     <p><a href="https://www.iana.org/domains/example">More information...</a></p>
│ </div>
│ </body>
│ </html>
│ 
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────