The mobile Safari browser doesn&#39;t support downloading files.

If Safari can display it, it will display. If you have installed other apps that can open the file, Safari will detect it for you.

Is there any overhead in Java for using a **try/catch** block, as opposed to an **if block** (assuming that the enclosed code otherwise does not request so)?

For example, take the following two simple implementations of a &quot;safe trim&quot; method for strings:

    public String tryTrim(String raw) {
        try {
            return raw.trim();
        } catch (Exception e) {
        }
        return null;
    }

    public String ifTrim(String raw) {
        if (raw == null) {
            return null;
        }
        return raw.trim();
    }

If the `raw` input is only rarely `null`, **is there any performance difference** between the two methods?

Furthermore, **is it a good programming pattern** to use the `tryTrim()` approach for simplifying the layout of code, especially when many **if blocks** checking rare error conditions can be avoided by enclosing the code in one try/catch block?

For example, it is a common case to have a method with `N parameters`, which uses `M &lt;= N` of them near its start, failing quickly and deterministically if any such parameter is &quot;invalid&quot; (e.g., a null or empty string), without affecting the rest of the code.

In such cases, instead of having to write `k * M` **if blocks** (where `k` is the average number of checks per parameter, e.g. `k = 2` for null or empty strings), a **try/catch** block would significantly shorten the code and a 1-2 line comment could be used to explicitly note the &quot;unconventional&quot; logic.

Such a pattern would also speed up the method, especially if the error conditions occur rarely, and it would do so without compromising program safety (assuming that the error conditions are &quot;normal&quot;, e.g. as in a string processing method where null or empty values are acceptable, albeit seldom in presence).


Java if vs. try/catch overhead

&gt; **Possible Duplicate:**  
&gt; [Javascript === vs == : Does it matter which &amp;ldquo;equal&amp;rdquo; operator I use?](https://stackoverflow.com/questions/359494/javascript-vs-does-it-matter-which-equal-operator-i-use)  
&gt; [Difference between == and === in JavaScript](https://stackoverflow.com/questions/523643/difference-between-and-in-javascript)  

&lt;!-- End of automatically inserted text --&gt;

I have two variables to compare.

Result should not be equal, in which condition i need to use !=  and  !== ?

because when i use both operator it is working properly, but i need to know exactly what is the difference. 



Javascript Comparison Operators != vs !==

I want my users to be able to download a PDF file and have the browser treat it as a file, not just display it (i.e. it has a filename, user gets option to save, etc.).  The following header seems to work well for this everywhere except for iOS:

    Content-Disposition: attachment; filename=file.pdf

iOS just ignores this and displays the image or document.  No big deal, you might think, except I&#39;m doing this in a hidden IFRAME as part of my download page, so the document is never even seen, and it looks like the download failed.

What&#39;s the best way to handle this in a cross-browser compatible manner?  Does iOS just ignore this header?  I can&#39;t find any spec or mention of this anywhere.  

Do I need to check for iOS in request headers and serve the response differently?  I was hoping to avoid this.  Thanks.

P.S. Any other helpful tips related to downloading files etc. in iOS web browsers are appreciated.

CLARIFICATION:  This regarding a regular web site browsed by the mobile Safari browser.  Not a native app.

HTTP &quot;Content-Disposition: attachment&quot; and downloading files on iOS web browser

I want my users to be able to download a PDF file and have the browser treat it as a file, not just display it (i.e. it has a filename, user gets option to save, etc.). The following header seems to work well for this everywhere except for iOS:
<pre><code class="hljs language-css">Content-Disposition: attachment; filename=file.pdf
</code></pre>
iOS just ignores this and displays the image or document. No big deal, you might think, except I'm doing this in a hidden IFRAME as part of my download page, so the document is never even seen, and it looks like the download failed.
What's the best way to handle this in a cross-browser compatible manner? Does iOS just ignore this header? I can't find any spec or mention of this anywhere.
Do I need to check for iOS in request headers and serve the response differently? I was hoping to avoid this. Thanks.
P.S. Any other helpful tips related to downloading files etc. in iOS web browsers are appreciated.
CLARIFICATION: This regarding a regular web site browsed by the mobile Safari browser. Not a native app.

I am using a `UITextField`. I want to increase its height but I have not found any property to do this.  How can I achieve this?

How to set UITextField height?

I&#39;m developing an iOS 4 application using iOS SDK latest version and XCode 4.2.

I have a XIB with a `UIWebView` with **Alpha = 1.0**, **Background** set to **Clear Color** and **Opaque** is not set. On this XIB I setup an image as background with this code:

    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
    {
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self) {
            UIColor *background = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@&quot;AboutBackground.png&quot;]];
            self.view.backgroundColor = background;
            [background release];
        }
        return self;
    }

The `UIWebView` is showing an static html:

    &lt;html&gt;&lt;head&gt;&lt;/head&gt;&lt;body style=\&quot;margin:0 auto;text-align:center;background-color: transparent; color:white\&quot;&gt;...&lt;/body&gt;&lt;/html&gt;

On iOS 5 simulator, its background is transparent, but on an iOS 4 device is grey.

Any clue?


UIWebView background is set to Clear Color, but it is not transparent

I referred to the [DOC](http://developer.apple.com/library/IOs/#documentation/UIKit/Reference/UIView_Class/UIView/UIView.html#//apple_ref/occ/clm/UIView/animateWithDuration:animations:) and it said:
&gt; __completion__  
&gt; ... This block has no return value and takes a single Boolean argument that indicates whether or not the animations actually finished before the completion handler was called. ...

But I find that no matter you use the bool parameter or not, the `completion:` block will always execute after `animations:` block. Just like the two simple block-based animation code snippets shown below, both of them are doing the same.

    [UIView animateWithDuration:0.3f
                      delay:0.0f
                    options:UIViewAnimationCurveEaseInOut
                 animations:^{
                     [myView setAlpha:0.0f];
                 }
                 completion:^(BOOL finished) {
                     [myView removeFromSuperview];
                 }];
and

    [UIView animateWithDuration:0.3f
                      delay:0.0f
                    options:UIViewAnimationCurveEaseInOut
                 animations:^{
                     [myView setAlpha:0.0f];
                 }
                 completion:^(BOOL finished) {
                     if (finished) [myView removeFromSuperview];
                 }];

And I find that most people(including me) use the first one(even the apple&#39;s official doc example). So,

- what&#39;s the `finished` parameter used for here exactly?
- or what&#39;s the situation will be used?

What exactly does bool parameter do in animateWithDuration:animations:completion:

How do you smooth a set of points in an iOS drawing app WHILE MOVING? I have tried UIBezierpaths but all I get are jagged ends where they intersect, when I just shift the points 1,2,3,4 - 2,3,4,5. I have heard of spline curves and all the other types. I am quite new to iPhone programming and do not understand how to program it in my quartz drawing app. A solid example would be greatly appreciated, I have spent weeks running in circles and I can never seem to find any iOS code for this task. Most of the posts just link to a java simulation or pages on wikipedia about curve fitting which does nothing for me. Also I do not want to switch to openGL ES. I hope someone can finally provide code to answer this circulating question.

---

This was my code for the UIBezierPath which left edges at intersection///

UPDATED TO AN ANSWER BELOW

    #define VALUE(_INDEX_) [NSValue valueWithCGPoint:points[_INDEX_]]
    #define POINT(_INDEX_) [(NSValue *)[points objectAtIndex:_INDEX_] CGPointValue]

    - (UIBezierPath*)smoothedPathWithGranularity:(NSInteger)granularity
    {
        NSMutableArray *points = [(NSMutableArray*)[self pointsOrdered] mutableCopy];
        
        if (points.count &lt; 4) return [self bezierPath];
        
        // Add control points to make the math make sense
        [points insertObject:[points objectAtIndex:0] atIndex:0];
        [points addObject:[points lastObject]];
        
        UIBezierPath *smoothedPath = [self bezierPath];
        [smoothedPath removeAllPoints];
        
        [smoothedPath moveToPoint:POINT(0)];
        
        for (NSUInteger index = 1; index &lt; points.count - 2; index++)
        {
            CGPoint p0 = POINT(index - 1);
            CGPoint p1 = POINT(index);
            CGPoint p2 = POINT(index + 1);
            CGPoint p3 = POINT(index + 2);
            
            // now add n points starting at p1 + dx/dy up until p2 using Catmull-Rom splines
            for (int i = 1; i &lt; granularity; i++)
            {
                float t = (float) i * (1.0f / (float) granularity);
                float tt = t * t;
                float ttt = tt * t;
                
                CGPoint pi; // intermediate point
                pi.x = 0.5 * (2*p1.x+(p2.x-p0.x)*t + (2*p0.x-5*p1.x+4*p2.x-p3.x)*tt + (3*p1.x-p0.x-3*p2.x+p3.x)*ttt);
                pi.y = 0.5 * (2*p1.y+(p2.y-p0.y)*t + (2*p0.y-5*p1.y+4*p2.y-p3.y)*tt + (3*p1.y-p0.y-3*p2.y+p3.y)*ttt);
                [smoothedPath addLineToPoint:pi];
            }
            
            // Now add p2
            [smoothedPath addLineToPoint:p2];
        }
        
        // finish by adding the last point
        [smoothedPath addLineToPoint:POINT(points.count - 1)];
        
        return smoothedPath;
    }
    - (PVPoint *)pointAppendingCGPoint:(CGPoint)CGPoint
    {
        PVPoint *newPoint = [[PVPoint alloc] initInsertingIntoManagedObjectContext:[self managedObjectContext]];
        [newPoint setCGPoint:CGPoint];
        [newPoint setOrder:[NSNumber numberWithUnsignedInteger:[[self points] count]]];
        [[self mutableSetValueForKey:@&quot;points&quot;] addObject:newPoint];
        [(NSMutableArray *)[self pointsOrdered] addObject:newPoint];
        [[self bezierPath] addLineToPoint:CGPoint];
        return [newPoint autorelease];
        
        if ([self bezierPath] &amp;&amp; [pointsOrdered count] &gt; 3)
        {
            PVPoint *control1 = [pointsOrdered objectAtIndex:[pointsOrdered count] - 2];
            PVPoint *control2 = [pointsOrdered objectAtIndex:[pointsOrdered count] - 1];
            [bezierPath moveToPoint:[[pointsOrdered objectAtIndex:[pointsOrdered count] - 3] CGPoint]];
            [[self bezierPath] addCurveToPoint:CGPoint controlPoint1:[control1 CGPoint] controlPoint2:[control2 CGPoint]];
            
        }
        
    }

    - (BOOL)isComplete { return [[self points] count] &gt; 1; }

    - (UIBezierPath *)bezierPath
    {
        if (!bezierPath)
        {
            bezierPath = [UIBezierPath bezierPath];
            for (NSUInteger p = 0; p &lt; [[self points] count]; p++)
            {
                if (!p) [bezierPath moveToPoint:[(PVPoint *)[[self pointsOrdered] objectAtIndex:p] CGPoint]];
                else [bezierPath addLineToPoint:[(PVPoint *)[[self pointsOrdered] objectAtIndex:p] CGPoint]];
            }
            [bezierPath retain];
        }
        
        return bezierPath;
    }

    - (CGPathRef)CGPath
    {
        return [[self bezierPath] CGPath];
    }


![phone screen][1]


  [1]: http://i.stack.imgur.com/hS7wY.png

Drawing Smooth Curves - Methods Needed

Where can I find information on how to modify these 

- `${EXECUTABLE_NAME}`
- `${PRODUCT_NAME}`

These are only displayed in .plist file but where are the actual values.

If we can directly modify what ever we want in .plist why we need these.

I am new that&#39;s why I&#39;m having problem understanding these, I also looked into apple information Property list key reference but didn&#39;t find these ${} values.


Where are ${EXECUTABLE_NAME} and ${PRODUCT_NAME} defined

A while ago I was experimenting, trying to see if i could get navigation items to animate and scroll between each other.

I don&#39;t know if this is related but suddenly without touching the simulator options I&#39;m getting this message `Simulator slow-motion animations are now on` and moving between views is very slow, like 3 seconds. This occurs with all animation effects.

Any idea what I need to do to stop this ?

Simulator slow-motion animations are now on?

I&#39;m trying to figure out what Javascript APIs I can use to achieve support for Mobile Safari back to iOS2. I haven&#39;t found a list anywhere that shows what version of Mobile Safari ships with each new version of iOS. I&#39;m looking for a comprehensive list that goes all the way back to iOS2.

Thanks!

[Edit: Yes, I know and love feature detection. However, I have a set of targeted browsers I need to support, and I just need to verify that the fallbacks I provided cover my target audience and that I don&#39;t need to provide additional fallbacks that are cumbersome hacks).]

What version of mobile safari comes with each version of iOS?

I have created a new Xcode project using Storyboards (tab view template). I added a couple of view controllers to my storyboard, and wanted to use a UITableView with static cells for one. I created it, but when I run in the simulator the cells don&#39;t appear. I haven&#39;t changed anything in the project except for this storyboard file. I am showing screenshots of the storyboard editor and the simulator running. The label shows up, so the view is loading correctly. I set the background color to gray so I can see the talbeview is loading. All cells are set to visible. I changed their style to Basic and edited the label, and added a disclosure indicator, that&#39;s all.

![simulator][1]
![xcode][2]


  [1]: http://i.stack.imgur.com/H0fNf.png
  [2]: http://i.stack.imgur.com/6oHJU.png

UITableView with static cells does not appear

    CGPoint offset = [_table contentOffset];
    [_table reloadData];
    [_table setContentOffset:offset animated:NO];    //unuseful

    //    __block UITableView *tableBlock = _table;
    //    [self performBlock:^(id sender) {
    //        [tableBlock setContentOffset:offset];
    //    } afterDelay:2];

I know don&#39;t know of any delegate method which gets called after `reloadData`. 
And using `afterDelay:2` which is kind of a hack may be too short or too long, so how can I implement it?

    

How to keep UITableView contentoffset after calling -reloadData

I&#39;ve yet to use ARC, since the majority of the code in the project I&#39;m working on at the moment was written pre-iOS 5.0. 

I was just wondering, does the convenience of not retaining/releasing manually (and presumably more reliable code that comes as a result?) outweigh any &#39;cost&#39; of using ARC?
What are your experiences of ARC, and would you recommend it?

So:

 - How much benefit can ARC bring to a project?
 - Does ARC have a cost like garbage collection in Java?
 - Have you been using ARC and if so, how have you found it so far?


To ARC or not to ARC? What are the pros and cons?

I got this problem: &quot;warning: iPad: Icon-72.png: icon dimensions (0 x 0) don&#39;t meet the size requirements.  The icon file must be 72x72 pixels, in .png format (-19014)&quot; when build for archive the iPad only app.
Have checked, my icon is 72x72 pixels. Also checked on info.plist file, the key CFBundleIconFiles already there. Before this have no problem to submit the app. After rejected by app review I want to resubmit (no changes has been made on my Xcode project) but the error appear. Does it because of I&#39;ve upgraded to Mac OSX Lion 10.7.3? (I just update to Mac OSX Lion 10.7.3 before resubmit the app).

Wonder why does the warning says &quot;icon dimensions (0 x 0)&quot;.

Please help me. Thanks.

warning: iPad: Icon-72.png: icon dimensions (0 x 0)

I am working on an iphone (iOS 4.0 or later) app and having some troubles with touch handling between multiple views. I am having a view structure like this

    ---&gt; A superView 
         |
         ---&gt; SubView - A 
         |
         ---&gt; SubView - B (exactly on top of A, completely blocking A).

 
  

 ![enter image description here][1]

  
 Basically I have a superView, and sibling subviews A and B. B has the same frame as A, hence hiding A completely. 

 Now my requirement is this. 
  

 1. **SubView B should receive all swipe and tap (single and double)
    gestures.**
 2. **SubView A should receive all pinch gestures.**

This is how I added gesture recognizers to the views

    UISwipeGestureRecognizer *leftSwipe  =  [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(leftSwipe:)];
    [leftSwipe setDirection:(UISwipeGestureRecognizerDirectionLeft)];
    leftSwipe.delegate  =   self;
    [bView addGestureRecognizer:leftSwipe];
    [leftSwipe release];
        
    UISwipeGestureRecognizer *rightSwipe  =  [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(rightSwipe:)];
    [rightSwipe setDirection:(UISwipeGestureRecognizerDirectionRight)];
    rightSwipe.delegate   =   self;
    [bView addGestureRecognizer:rightSwipe];
    [rightSwipe release];
        
    UIPinchGestureRecognizer *pinch   =  [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinch:)];
    pinch.delegate    =   self;
    [aView addGestureRecognizer:pinch];
    [pinch release];


I did some research and to me `UIGestureRecognizerDelegate` looked promising and I implemented the delegate method

    - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer

I returned NO for SubView B, hoping that underlying view will get these event. No such luck though

    - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
        if ([gestureRecognizer isKindOfClass:[UIPinchGestureRecognizer class]] &amp;&amp; [gestureRecognizer view] == bView) {
            NSLog(@&quot;pinchGesture&quot;);
            //bView.userInteractionEnabled = NO;
            return NO;
        }
        return YES;
    }
Then I disabled user interaction of SubView B inside the delegate callback (commented code in above block), when pinch gesture is recognized, hoping remaining part of gesture will be received by SubView A. No such luck there too.. 

So that is where I stand now. I have seen [this][2] question, where the accepted answer involves property `cancelsTouchesInView`. But I believe `cancelsTouchesInView` only cancel a particular touch event, do not forward it. 

Any other way to achieve my requirement? I am ready to work on whatever hint you provide.

&lt;h2&gt;EDIT : BOUNTY TIME&lt;/h2&gt;

My so called subView A is actually an instance of a 3rd party library&#39;s View class, which takes all touches away and I don&#39;t have any control over any gestures on it. I want different implementation for left and right swipe and I want pinch, tap etc work just like it is working with this third party view. So I put a view on top of A (SubView B) to get left and right swipes. But now I want to forward other gesture events to underlying library.

  [1]: http://i.stack.imgur.com/zBkpS.png
  [2]: https://stackoverflow.com/questions/6175255/uigesturerecognizer-receive-touch-but-forward-it-to-uicontrol-as-well

Forwarding UIGesture to views behind

Is this possible to share data between two applications on the same device?

Or can I allow some other application to use my application&#39;s information / data or in any other way?

For example, the first application is for event management, and I use it to save some event. The second application is for reminders, which will get data from the other application in order to remind me about the event.

This is just a simple example, not a real scenario.

Share data between two or more iPhone applications

It is a fairly common requirement to support undeletes or delayed/batched deletions for data services. What I&#39;m wondering is how to implement this in a RESTful way. I&#39;m torn between a few different options (none of which seems terribly attractive to me). Common across these different options, I believe, is the need for an API which returns all resource marked as deleted for a particular resource type.

Here are some options I&#39;ve thought about and some of their pros/cons:

Options to mark resource as deleted:

 -  Use HTTP DELETE to mark the resource as deleted.
 -  Use HTTP PUT/POST to update deleted flag. This doesn&#39;t feel right since it maps what is essentially a deletion away from the HTTP DELETE method and into other HTTP methods.

Options when GET-ing resource marked for deletion:

 -  Return HTTP Status 404 for a resource marked as deleted. Clean &amp; transparent, but how do we tell the difference between a resource that is really deleted vs. one just marked as deleted.
 -  Return HTTP Status 410. Provides way to tell the difference, but 410 technically says it &quot;is expected to be considered permanent. Clients with link editing capabilities SHOULD delete references to the Request-URI after user approval.&quot; There may be enough wiggle room in the words &quot;expected&quot; and &quot;SHOULD&quot; here. Not sure how well 410 is supported/understood out there in clients.
 -  Return HTTP Status 200 and include flag field indicating resource is deleted. This seems wierd since the idea of deleting it in the first place was because you actually wanted it to not appear. This pushes responsibility for filtering out deleted resources down to clients.

Options for responses which include this deleted resource:

 -  Omit the resources makred as deleted. Clean &amp; simple. But what if you actually want to know about deleted resources.
 -  Include them along with field indicating that they are deleted. This pushes responsibility for filtering out deleted resources down to clients. It makes pagination tricky if you want to only page through active or deleted resources.

Options when updating a resource marked for deletion:

 -  Use HTTP Status 404. The resource is gone right? But, how can you tell the difference between a resource marked as deleted and one actually deleted. HTTP body in 404 response could disambiguate here but then clients are left with parsing/interpreting your body to disambiguate. Maybe response header might help here? Which one? Custom header?
 -  Use HTTP Status 409 with message about how resource must first be undeleted.

Options to undelete resource marked for deletion:

 -  Use HTTP PUT/POST for update operation of resource and mark it as active again. This only works as long as you&#39;re not returning an HTTP 404 for the GET operation for the resource since it doesn&#39;t make since to PUT/POST to a resource that is &quot;Not found&quot; (404).
 -  Use HTTP PUT/POST for creation operation of resource. The problem here is which data takes precedence? The data sent up in the create operation? Or the data that is being undeleted? filter it out of any other queries that would have returned it. Then, treat the HTTP PUT/POST that creates the resource as an undelete if the resource identifier points to a resource marked as deleted.
 -  Separate REST path dedicated to undelete resources marked for deletion.

This is by no means an exhaustive list. I just wanted to enumerate some of the options that have been bouncing around in my head.

I know the answer to how to do this is, as usual, &quot;it depends&quot;. What I&#39;m curious about is what qualifications/requirements would you use to make your decision? How have you seen this implemented or implemented it yourself?

RESTful undelete

I&#39;m working on a machine with limited memory, and I&#39;d like to upload a dynamically generated (not-from-disk) file in a streaming manner to S3.  In other words, I don&#39;t know the file size when I start the upload, but I&#39;ll know it by the end.  Normally a PUT request has a Content-Length header, but perhaps there is a way around this, such as using multipart or chunked content-type.

S3 can support streaming uploads.  For example, see here:

http://blog.odonnell.nu/posts/streaming-uploads-s3-python-and-poster/

My question is, can I accomplish the same thing without having to specify the file length at the start of the upload?



Can I stream a file upload to S3 without a content-length header?

When I submit a simple form like this with a file attached:

    &lt;form enctype=&quot;multipart/form-data&quot; action=&quot;http://localhost:3000/upload?upload_progress_id=12344&quot; method=&quot;POST&quot;&gt;
    &lt;input type=&quot;hidden&quot; name=&quot;MAX_FILE_SIZE&quot; value=&quot;100000&quot; /&gt;
    Choose a file to upload: &lt;input name=&quot;uploadedfile&quot; type=&quot;file&quot; /&gt;&lt;br /&gt;
    &lt;input type=&quot;submit&quot; value=&quot;Upload File&quot; /&gt;
    &lt;/form&gt;

How does it send the file internally? Is the file sent as part of the HTTP body as data? In the headers of this request, I don&#39;t see anything related to the name of the file. 

I just would like the know the internal workings of the HTTP when sending a file.

How does HTTP file upload work?

I&#39;m trying to figure out how the best way to easily send HTTP/HTTPS requests and to handle gzip/deflate compressed responses along with cookies.

The best I found was https://github.com/mikeal/request which handles everything _except_ compression. Is there a module or method that will do everything I ask?

If not, can I combine request and zlib in some manner? I tried to combine zlib and `http.ServerRequest`, and it failed miserably.

Easy HTTP requests with gzip/deflate compression

How do you return **503 Service Unavailable** in Rails for the entire application? 

Also, how do you do the same for specific controllers?

Return a specific http status code in Rails

Earlier I used `httplib` module to add a header in the request. Now I am trying the same thing with the `requests` module.

This is the python request module I am using:
http://pypi.python.org/pypi/requests

How can I add a header to `request.post()` and `request.get()`. Say I have to add `foobar` key in each request in the header.



Adding headers to requests module

I&#39;d like to send a `401 Unauthorized` AND redirect the client somewhere. However:

if I do it like this:

    header(&#39;HTTP/1.1 401 Unauthorized&#39;);
    header(&#39;Location: /&#39;);

the server sends a `302 Found` with `Location`, so not a `401 Unauthorized`.

If I do it like this:

    header(&#39;Location: /&#39;);
    header(&#39;HTTP/1.1 401 Unauthorized&#39;);

the browser receives both a `401 Unauthorized` and a `Location`, but does not redirect.

(IE 9 and Chrome 16 behave the same, so I&#39;m guessing it&#39;s correct)

Maybe I&#39;m misusing HTTP? I&#39;d like my app interface to be exactly the same for all clients: text browser, modern browser, API calls etc. The 401 + response text would tell an API user what&#39;s what. The redirect is useful for a browser.

Is there a (good) way?

Is it possible to send a 401 Unauthorized AND redirect (with a Location)?

So I&#39;ve been toying around with HTTP for fun in telnet now (i.e. just typing in `telnet google.com 80` and putting in random GETs and POSTs with different headers and the like) but I&#39;ve come across something that google.com transmits in it&#39;s headers that I don&#39;t know.

I&#39;ve been looking through http://www.w3.org/Protocols/rfc2616/rfc2616.html and have found no definition for this particular http-header that google seems to be spouting out:


    GET / HTTP/1.1
    
    HTTP/1.1 200 OK
    Date: Wed, 01 Feb 2012 03:42:24 GMT
    Expires: -1
    Cache-Control: private, max-age=0
    Content-Type: text/html; charset=ISO-8859-1
    Set-Cookie: PREF=ID=6ddbc0a0342e7e63:FF=0:TM=1328067744:LM=1328067744:S=4d4farvCGl5Ww0C3; expires=Fri, 31-Jan-2014 03:42:24 GMT; path=/; domain=.google.com
    Set-Cookie: NID=56=PgRwCKa8EltKnHS5clbFuhwyWsd3cPXiV1-iXzgyKsiy5RKXEKbg89gWWpjzYZjLPWTKrCWhOUhdInOlYU56LOb2W7XpC7uBnKAjMbxQSBw1UIprzw2BFK5dnaY7PRji; expires=Thu, 02-Aug-2012 03:42:24 GMT; path=/; domain=.google.com; HttpOnly
    P3P: CP=&quot;This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&amp;answer=151657 for more info.&quot;
    Server: gws
    X-XSS-Protection: 1; mode=block
    X-Frame-Options: SAMEORIGIN
    Transfer-Encoding: chunked
    
    1000

Anyone know what `X-XSS-Protection` is?




What is the http-header &quot;X-XSS-Protection&quot;?

What is the difference between these headers?

    Content-Type: application/javascript
    Content-Type: application/x-javascript
    Content-Type: text/javascript

Which one is best and why?

Please do not say they are identical - if they were identical there would not have been three of them. I know both work - but I would like to know the difference.

Difference between application/x-javascript and text/javascript content types

One can request only the headers using HTTP HEAD, as option `-I` in `curl(1)`.

    $ curl -I /

Lengthy HTML response bodies are a pain to get in command-line, so I&#39;d like to get only the header as feedback for my POST requests. However, HEAD and POST are two different methods.

How do I get cURL to display only response headers to a POST request?

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Solution 1 - Iphone	aelam	View Answer on Stackoverflow

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