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# Changelog
## v1.6.0
- Recommend absolute paths for rewrite targets. Contributed by @helfi92.
## v1.5.0
- Expose the HTTP request object in rewrite rules. Contributed by @VladShcherbin.
## v1.4.0
- The `.` (DOT) rule should only check the last path element. Contributed by @ntkme.
## v1.3.0
- Allow disabling of the `.` (DOT) rule via the `disableDotRule` option.
## v1.2.0
- Support definition of custom HTML `Accept` header values. Contributed by @cgmartin.
## v1.1.0
- Rewrite rules are now applied before the request URL is checked for dots.
- Rewrite rules can be defined as functions to have greater control over the `dot rule`.
## v1.0.0
This version introduces a fair amount of breaking changes. Specifically, instances of the historyApiFallback need to be created via the exported function. Previously, this was not necessary.
- **Breaking:** Support multiple instances of the historyApiFallback middleware with different configurations.
- **Breaking:** Loggers are configured per historyApiFallback middleware instance (see `README.md`).
- The fallback index HTML file can be configured. Default is `/index.html`.
- Additional rewrite rules can be defined via regular expressions.

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The MIT License
Copyright (c) 2012 Ben Ripkens http://bripkens.de
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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<h1 align="center">connect-history-api-fallback</h1>
<p align="center">Middleware to proxy requests through a specified index page, useful for Single Page Applications that utilise the HTML5 History API.</p>
[![Build Status](https://travis-ci.org/bripkens/connect-history-api-fallback.svg?branch=master)](https://travis-ci.org/bripkens/connect-history-api-fallback)
[![Dependency Status](https://david-dm.org/bripkens/connect-history-api-fallback/master.svg)](https://david-dm.org/bripkens/connect-history-api-fallback/master)
[![NPM](https://nodei.co/npm/connect-history-api-fallback.png?downloads=true&downloadRank=true)](https://nodei.co/npm/connect-history-api-fallback/)
<h2>Table of Contents</h2>
<!-- TOC depthFrom:2 depthTo:6 withLinks:1 updateOnSave:1 orderedList:0 -->
- [Introduction](#introduction)
- [Usage](#usage)
- [Options](#options)
- [index](#index)
- [rewrites](#rewrites)
- [verbose](#verbose)
- [htmlAcceptHeaders](#htmlacceptheaders)
- [disableDotRule](#disabledotrule)
<!-- /TOC -->
## Introduction
Single Page Applications (SPA) typically only utilise one index file that is
accessible by web browsers: usually `index.html`. Navigation in the application
is then commonly handled using JavaScript with the help of the
[HTML5 History API](http://www.w3.org/html/wg/drafts/html/master/single-page.html#the-history-interface).
This results in issues when the user hits the refresh button or is directly
accessing a page other than the landing page, e.g. `/help` or `/help/online`
as the web server bypasses the index file to locate the file at this location.
As your application is a SPA, the web server will fail trying to retrieve the file and return a *404 - Not Found*
message to the user.
This tiny middleware addresses some of the issues. Specifically, it will change
the requested location to the index you specify (default being `/index.html`)
whenever there is a request which fulfills the following criteria:
1. The request is a GET request
2. which accepts `text/html`,
3. is not a direct file request, i.e. the requested path does not contain a
`.` (DOT) character and
4. does not match a pattern provided in options.rewrites (see options below)
## Usage
The middleware is available through NPM and can easily be added.
```
npm install --save connect-history-api-fallback
```
Import the library
```javascript
var history = require('connect-history-api-fallback');
```
Now you only need to add the middleware to your application like so
```javascript
var connect = require('connect');
var app = connect()
.use(history())
.listen(3000);
```
Of course you can also use this piece of middleware with express:
```javascript
var express = require('express');
var app = express();
app.use(history());
```
## Options
You can optionally pass options to the library when obtaining the middleware
```javascript
var middleware = history({});
```
### index
Override the index (default `/index.html`)
```javascript
history({
index: '/default.html'
});
```
### rewrites
Override the index when the request url matches a regex pattern. You can either rewrite to a static string or use a function to transform the incoming request.
The following will rewrite a request that matches the `/\/soccer/` pattern to `/soccer.html`.
```javascript
history({
rewrites: [
{ from: /\/soccer/, to: '/soccer.html'}
]
});
```
Alternatively functions can be used to have more control over the rewrite process. For instance, the following listing shows how requests to `/libs/jquery/jquery.1.12.0.min.js` and the like can be routed to `./bower_components/libs/jquery/jquery.1.12.0.min.js`. You can also make use of this if you have an API version in the URL path.
```javascript
history({
rewrites: [
{
from: /^\/libs\/.*$/,
to: function(context) {
return '/bower_components' + context.parsedUrl.pathname;
}
}
]
});
```
The function will always be called with a context object that has the following properties:
- **parsedUrl**: Information about the URL as provided by the [URL module's](https://nodejs.org/api/url.html#url_url_parse_urlstr_parsequerystring_slashesdenotehost) `url.parse`.
- **match**: An Array of matched results as provided by `String.match(...)`.
- **request**: The HTTP request object.
### verbose
This middleware does not log any information by default. If you wish to activate logging, then you can do so via the `verbose` option or by specifying a logger function.
```javascript
history({
verbose: true
});
```
Alternatively use your own logger
```javascript
history({
logger: console.log.bind(console)
});
```
### htmlAcceptHeaders
Override the default `Accepts:` headers that are queried when matching HTML content requests (Default: `['text/html', '*/*']`).
```javascript
history({
htmlAcceptHeaders: ['text/html', 'application/xhtml+xml']
})
```
### disableDotRule
Disables the dot rule mentioned above:
> […] is not a direct file request, i.e. the requested path does not contain a `.` (DOT) character […]
```javascript
history({
disableDotRule: true
})
```

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'use strict';
var url = require('url');
exports = module.exports = function historyApiFallback(options) {
options = options || {};
var logger = getLogger(options);
return function(req, res, next) {
var headers = req.headers;
if (req.method !== 'GET') {
logger(
'Not rewriting',
req.method,
req.url,
'because the method is not GET.'
);
return next();
} else if (!headers || typeof headers.accept !== 'string') {
logger(
'Not rewriting',
req.method,
req.url,
'because the client did not send an HTTP accept header.'
);
return next();
} else if (headers.accept.indexOf('application/json') === 0) {
logger(
'Not rewriting',
req.method,
req.url,
'because the client prefers JSON.'
);
return next();
} else if (!acceptsHtml(headers.accept, options)) {
logger(
'Not rewriting',
req.method,
req.url,
'because the client does not accept HTML.'
);
return next();
}
var parsedUrl = url.parse(req.url);
var rewriteTarget;
options.rewrites = options.rewrites || [];
for (var i = 0; i < options.rewrites.length; i++) {
var rewrite = options.rewrites[i];
var match = parsedUrl.pathname.match(rewrite.from);
if (match !== null) {
rewriteTarget = evaluateRewriteRule(parsedUrl, match, rewrite.to, req);
if(rewriteTarget.charAt(0) !== '/') {
logger(
'We recommend using an absolute path for the rewrite target.',
'Received a non-absolute rewrite target',
rewriteTarget,
'for URL',
req.url
);
}
logger('Rewriting', req.method, req.url, 'to', rewriteTarget);
req.url = rewriteTarget;
return next();
}
}
var pathname = parsedUrl.pathname;
if (pathname.lastIndexOf('.') > pathname.lastIndexOf('/') &&
options.disableDotRule !== true) {
logger(
'Not rewriting',
req.method,
req.url,
'because the path includes a dot (.) character.'
);
return next();
}
rewriteTarget = options.index || '/index.html';
logger('Rewriting', req.method, req.url, 'to', rewriteTarget);
req.url = rewriteTarget;
next();
};
};
function evaluateRewriteRule(parsedUrl, match, rule, req) {
if (typeof rule === 'string') {
return rule;
} else if (typeof rule !== 'function') {
throw new Error('Rewrite rule can only be of type string or function.');
}
return rule({
parsedUrl: parsedUrl,
match: match,
request: req
});
}
function acceptsHtml(header, options) {
options.htmlAcceptHeaders = options.htmlAcceptHeaders || ['text/html', '*/*'];
for (var i = 0; i < options.htmlAcceptHeaders.length; i++) {
if (header.indexOf(options.htmlAcceptHeaders[i]) !== -1) {
return true;
}
}
return false;
}
function getLogger(options) {
if (options && options.logger) {
return options.logger;
} else if (options && options.verbose) {
return console.log.bind(console);
}
return function(){};
}

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{
"_args": [
[
"connect-history-api-fallback@1.6.0",
"/Users/tatiana/selfdefined"
]
],
"_from": "connect-history-api-fallback@1.6.0",
"_id": "connect-history-api-fallback@1.6.0",
"_inBundle": false,
"_integrity": "sha512-e54B99q/OUoH64zYYRf3HBP5z24G38h5D3qXu23JGRoigpX5Ss4r9ZnDk3g0Z8uQC2x2lPaJ+UlWBc1ZWBWdLg==",
"_location": "/connect-history-api-fallback",
"_phantomChildren": {},
"_requested": {
"type": "version",
"registry": true,
"raw": "connect-history-api-fallback@1.6.0",
"name": "connect-history-api-fallback",
"escapedName": "connect-history-api-fallback",
"rawSpec": "1.6.0",
"saveSpec": null,
"fetchSpec": "1.6.0"
},
"_requiredBy": [
"/browser-sync",
"/browser-sync-ui"
],
"_resolved": "https://registry.npmjs.org/connect-history-api-fallback/-/connect-history-api-fallback-1.6.0.tgz",
"_spec": "1.6.0",
"_where": "/Users/tatiana/selfdefined",
"author": {
"name": "Ben Ripkens",
"email": "bripkens.dev@gmail.com",
"url": "http://bripkens.de"
},
"bugs": {
"url": "https://github.com/bripkens/connect-history-api-fallback/issues"
},
"contributors": [
{
"name": "Craig Myles",
"email": "cr@igmyles.com",
"url": "http://www.craigmyles.com"
}
],
"description": "Provides a fallback for non-existing directories so that the HTML 5 history API can be used.",
"devDependencies": {
"eslint": "^0.18.0",
"nodeunit": "^0.11.3",
"sinon": "^1.14.1"
},
"engines": {
"node": ">=0.8"
},
"files": [
"lib"
],
"homepage": "https://github.com/bripkens/connect-history-api-fallback#readme",
"keyswords": [
"connect",
"html5",
"history api",
"fallback",
"spa"
],
"license": "MIT",
"main": "lib/index.js",
"name": "connect-history-api-fallback",
"repository": {
"type": "git",
"url": "git+ssh://git@github.com/bripkens/connect-history-api-fallback.git"
},
"scripts": {
"test": "eslint lib/index.js test/index_test.js && nodeunit test/index_test.js"
},
"version": "1.6.0"
}